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Materials and corrosion |
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Ajouter le résultat dans votre panierEvaluation of corrosion behaviour in a 317L stainless steel strip welding using scanning Kelvin probe force microscopy / N. Sathirachinda in Materials and corrosion, Vol. 62 N° 12 (Décembre 2011)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1092–1099
Titre : Evaluation of corrosion behaviour in a 317L stainless steel strip welding using scanning Kelvin probe force microscopy Type de document : texte imprimé Auteurs : N. Sathirachinda, Auteur ; S. Wessman, Auteur ; R. Pettersson, Auteur Année de publication : 2012 Article en page(s) : pp. 1092–1099 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Stainless steel Strip welding Scanning Kelvin probe force microscopy Volta potential Uniform corrosion Pitting corrosion Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Scanning Kelvin probe force microscopy and magnetic force microscopy have been used in combination with SEM/EDS and immersion tests to study a 317L electroslag strip weld which contains austenite and interdendritic ferrite and sigma phase. The individual phases can easily be recognized from the compositional contrast, magnetic pattern and Volta potential variation. Austenite, which is paramagnetic, exhibits the highest Volta potential followed by non-magnetic sigma phase and ferromagnetic ferrite, respectively. Corrosion testing in acidic chloride solutions indicates that the Volta potential measured in air can be related to the tendency to uniform corrosion, while pitting corrosion shows different dependence. In both cases ferrite and sigma phase behaved in a similar manner, indicating that there was no specific detrimental effect of sigma phase on corrosion properties in this material.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005647/abstract [article] Evaluation of corrosion behaviour in a 317L stainless steel strip welding using scanning Kelvin probe force microscopy [texte imprimé] / N. Sathirachinda, Auteur ; S. Wessman, Auteur ; R. Pettersson, Auteur . - 2012 . - pp. 1092–1099.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1092–1099
Mots-clés : Stainless steel Strip welding Scanning Kelvin probe force microscopy Volta potential Uniform corrosion Pitting corrosion Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Scanning Kelvin probe force microscopy and magnetic force microscopy have been used in combination with SEM/EDS and immersion tests to study a 317L electroslag strip weld which contains austenite and interdendritic ferrite and sigma phase. The individual phases can easily be recognized from the compositional contrast, magnetic pattern and Volta potential variation. Austenite, which is paramagnetic, exhibits the highest Volta potential followed by non-magnetic sigma phase and ferromagnetic ferrite, respectively. Corrosion testing in acidic chloride solutions indicates that the Volta potential measured in air can be related to the tendency to uniform corrosion, while pitting corrosion shows different dependence. In both cases ferrite and sigma phase behaved in a similar manner, indicating that there was no specific detrimental effect of sigma phase on corrosion properties in this material.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005647/abstract
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1100–1105
Titre : Transformation of green rust (Cl−) into different oxyhydroxides in aqueous solution containing molybdenum ions Type de document : texte imprimé Auteurs : F. Nagata, Auteur ; K. Inoue, Auteur ; S. Fujieda, Auteur Année de publication : 2012 Article en page(s) : pp. 1100–1105 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Green rust Iron oxyhydroxide Molybdenum Oxidation X-ray diffraction Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : To investigate the influence of the addition of molybdenum ions on the transformation of green rust GR(Cl−) comprising Fe(II) and Fe(III) into different oxyhydroxides, suspensions of GR(Cl−) containing molybdenum ions were oxidized by passing nitrogen gas containing oxygen through the suspensions. X-ray diffraction (XRD) was used for identifying the solid particles formed by oxidation. The results showed that in the presence of molybdenum ions, the formation of β-FeOOH and α-FeOOH was enhanced as compared to that of γ-FeOOH in the GR(Cl−) suspensions. This implied that the molybdenum ions interacted with the chloride ions obtained from GR(Cl−) and induced the formation of β-FeOOH that contained chloride ions. Transmission electron micrographs of the solid particles showed that the particle size of the resulting oxyhydroxides was considerably reduced because of the addition of the molybdenum ions. The pH and oxidation–reduction potential (ORP) of the aqueous solution were also measured during the oxidation. The addition of molybdenum ions was found to cause characteristic changes in the pH and ORP in the initial stage of the oxidation.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905627/abstract [article] Transformation of green rust (Cl−) into different oxyhydroxides in aqueous solution containing molybdenum ions [texte imprimé] / F. Nagata, Auteur ; K. Inoue, Auteur ; S. Fujieda, Auteur . - 2012 . - pp. 1100–1105.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1100–1105
Mots-clés : Green rust Iron oxyhydroxide Molybdenum Oxidation X-ray diffraction Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : To investigate the influence of the addition of molybdenum ions on the transformation of green rust GR(Cl−) comprising Fe(II) and Fe(III) into different oxyhydroxides, suspensions of GR(Cl−) containing molybdenum ions were oxidized by passing nitrogen gas containing oxygen through the suspensions. X-ray diffraction (XRD) was used for identifying the solid particles formed by oxidation. The results showed that in the presence of molybdenum ions, the formation of β-FeOOH and α-FeOOH was enhanced as compared to that of γ-FeOOH in the GR(Cl−) suspensions. This implied that the molybdenum ions interacted with the chloride ions obtained from GR(Cl−) and induced the formation of β-FeOOH that contained chloride ions. Transmission electron micrographs of the solid particles showed that the particle size of the resulting oxyhydroxides was considerably reduced because of the addition of the molybdenum ions. The pH and oxidation–reduction potential (ORP) of the aqueous solution were also measured during the oxidation. The addition of molybdenum ions was found to cause characteristic changes in the pH and ORP in the initial stage of the oxidation.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905627/abstract
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1106–1110
Titre : Micro-electrochemical characterization of galvanic corrosion of TA2/316L composite plate Type de document : texte imprimé Auteurs : X. Cheng, Auteur ; X. Li, Auteur ; C. Dong, Auteur Année de publication : 2012 Article en page(s) : pp. 1106–1110 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Micro-electrochemical measurements Galvanic corrosion Stainless steel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Galvanic corrosion behavior of TA2/316L composite plate was investigated in the solution of 3.5 wt% NaCl by galvanic potential monitoring, scanning localized electrochemical impedance spectroscopy (LEIS) and scanning vibrating micro-electrode (SVME) techniques. The results demonstrated that the pitting corrosion resistance of 316L for the galvanic combination sample is lower, and the coupled current density is higher than for the single 316L sample. It indicates that the galvanic action works on the corrosion behavior of the TA2 titanium alloy/316L stainless steel galvanic combination in sodium chloride solution. The galvanic effect width was determined as 1500 µm.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005644/abstract [article] Micro-electrochemical characterization of galvanic corrosion of TA2/316L composite plate [texte imprimé] / X. Cheng, Auteur ; X. Li, Auteur ; C. Dong, Auteur . - 2012 . - pp. 1106–1110.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1106–1110
Mots-clés : Micro-electrochemical measurements Galvanic corrosion Stainless steel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Galvanic corrosion behavior of TA2/316L composite plate was investigated in the solution of 3.5 wt% NaCl by galvanic potential monitoring, scanning localized electrochemical impedance spectroscopy (LEIS) and scanning vibrating micro-electrode (SVME) techniques. The results demonstrated that the pitting corrosion resistance of 316L for the galvanic combination sample is lower, and the coupled current density is higher than for the single 316L sample. It indicates that the galvanic action works on the corrosion behavior of the TA2 titanium alloy/316L stainless steel galvanic combination in sodium chloride solution. The galvanic effect width was determined as 1500 µm.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005644/abstract
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1111–1116
Titre : Electrochemical stability and surface analysis in evaluation fluoride effect on new bioalloy Ti7Al3V2Mo2Fe used in dentistry Type de document : texte imprimé Auteurs : D. Ionita, Auteur ; M. Prodana, Auteur ; I. Demetrescu, Auteur Année de publication : 2012 Article en page(s) : pp. 1111–1116 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Artificial saliva Fluoride ions Hydroxyapatite Ti7Al3V2Mo2Fe uncoated/coated Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The aim of this study is focused on the effect of fluoride concentration on the corrosion behavior of Ti7Al3V2Mo2Fe alloys uncoated/coated in artificial saliva. Ti7Al3V2Mo2Fe alloys were covered by chemical methods with hydroxyapatite to enhance the osteointegration of implants materials. The stability of Ti7Al3V2Mo2Fe alloys uncoated/coated in artificial saliva with/without fluoride ions was studied by electrochemical techniques (open circuit potential, cyclic voltammetry, and linear polarization). On the covered samples, dissolution test in simulated body fluids and wettability test were performed. Investigations regarding the sample surface modifications were made by atomic force microscopy and Fourier transform infrared spectroscopy. The results show that the corrosion resistance of Ti7Al3V2Mo2Fe in solution containing fluoride decreases in comparison with that in a solution not containing fluoride. Significant changes appear at a concentration larger than 0.05 M. The coating has a positive effect on corrosion resistance of metallic substrate in the fluoride presence acting as a semi-mechanical barrier.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005661/abstract [article] Electrochemical stability and surface analysis in evaluation fluoride effect on new bioalloy Ti7Al3V2Mo2Fe used in dentistry [texte imprimé] / D. Ionita, Auteur ; M. Prodana, Auteur ; I. Demetrescu, Auteur . - 2012 . - pp. 1111–1116.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1111–1116
Mots-clés : Artificial saliva Fluoride ions Hydroxyapatite Ti7Al3V2Mo2Fe uncoated/coated Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The aim of this study is focused on the effect of fluoride concentration on the corrosion behavior of Ti7Al3V2Mo2Fe alloys uncoated/coated in artificial saliva. Ti7Al3V2Mo2Fe alloys were covered by chemical methods with hydroxyapatite to enhance the osteointegration of implants materials. The stability of Ti7Al3V2Mo2Fe alloys uncoated/coated in artificial saliva with/without fluoride ions was studied by electrochemical techniques (open circuit potential, cyclic voltammetry, and linear polarization). On the covered samples, dissolution test in simulated body fluids and wettability test were performed. Investigations regarding the sample surface modifications were made by atomic force microscopy and Fourier transform infrared spectroscopy. The results show that the corrosion resistance of Ti7Al3V2Mo2Fe in solution containing fluoride decreases in comparison with that in a solution not containing fluoride. Significant changes appear at a concentration larger than 0.05 M. The coating has a positive effect on corrosion resistance of metallic substrate in the fluoride presence acting as a semi-mechanical barrier.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005661/abstract
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1117–1123
Titre : Evaluating electrochemical behaviour of recrystallized titanium alloys in Ringer's solution Type de document : texte imprimé Auteurs : D. Mareci, Auteur ; R. Chelariu, Auteur ; D. Sutiman, Auteur Année de publication : 2012 Article en page(s) : pp. 1117–1123 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion EIS Polarization Recrystallization Titanium alloys Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : By anodic potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques, the effect of recrystallization on the corrosion and electrochemical behaviour of Ti12Mo and Ti12Mo5Ta alloys was studied. Aerated Ringer's solution was employed as electrolyte solution at 37 °C. The pH was 6.9 and adjusted to 2.5 simulating the disease state. The results show excellent corrosion resistance for recrystallized Ti12Mo and Ti12Mo5Ta alloys, corroborated by high values of polarization resistance and low values of passive current density. Recrystallized structure rendered the Ti12Mo and Ti12Mo5Ta alloys extremely corrosion resistant.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106185/abstract [article] Evaluating electrochemical behaviour of recrystallized titanium alloys in Ringer's solution [texte imprimé] / D. Mareci, Auteur ; R. Chelariu, Auteur ; D. Sutiman, Auteur . - 2012 . - pp. 1117–1123.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1117–1123
Mots-clés : Corrosion EIS Polarization Recrystallization Titanium alloys Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : By anodic potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques, the effect of recrystallization on the corrosion and electrochemical behaviour of Ti12Mo and Ti12Mo5Ta alloys was studied. Aerated Ringer's solution was employed as electrolyte solution at 37 °C. The pH was 6.9 and adjusted to 2.5 simulating the disease state. The results show excellent corrosion resistance for recrystallized Ti12Mo and Ti12Mo5Ta alloys, corroborated by high values of polarization resistance and low values of passive current density. Recrystallized structure rendered the Ti12Mo and Ti12Mo5Ta alloys extremely corrosion resistant.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106185/abstract
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1124–1132
Titre : Fabrication and characterization of micro-arc oxidation (MAO) coatings on Mg-Li alloy in alkaline polyphosphate electrolytes without and with the addition of K2TiF6 Type de document : texte imprimé Auteurs : L. Song, Auteur ; Y. Kou, Auteur ; Y. Song, Auteur Année de publication : 2012 Article en page(s) : pp. 1124–1132 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion resistance Mg-Li alloy Micro-arc oxidation Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Micro-arc oxidation (MAO) has been accomplished on Mg-Li alloy in alkaline polyphosphate electrolytes without and with the addition of 10 g/L K2TiF6. The surface/cross-section microstructures of the fabricated coatings were analyzed by scanning electron microscope (SEM); the compositions of the fabricated MAO coatings were analyzed by X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDAX); the corrosion behaviors of bare and MAO coated Mg-Li alloys were evaluated using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) in 3.5 wt% NaCl solution. Novel hybrid MAO coatings which showed hybrid composition of MgF2/Ti2O5/Ti6O11/MgO, as well as hybrid structure of a dense inner layer, a dense outer layer and an intermediate layer with some sealed/semi-sealed pores, had been fabricated on Mg-Li alloy in alkaline polyphosphate electrolytes with the addition of K2TiF6. Meanwhile, the corrosion resistance of the fabricated MAO coatings was improved obviously as the result of the addition of K2TiF6 in the electrolytes. Moreover, the multiple roles of on the MAO process accounted for the fabrication of the corrosion-resistant hybrid MAO coatings.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006050/abstract [article] Fabrication and characterization of micro-arc oxidation (MAO) coatings on Mg-Li alloy in alkaline polyphosphate electrolytes without and with the addition of K2TiF6 [texte imprimé] / L. Song, Auteur ; Y. Kou, Auteur ; Y. Song, Auteur . - 2012 . - pp. 1124–1132.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1124–1132
Mots-clés : Corrosion resistance Mg-Li alloy Micro-arc oxidation Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Micro-arc oxidation (MAO) has been accomplished on Mg-Li alloy in alkaline polyphosphate electrolytes without and with the addition of 10 g/L K2TiF6. The surface/cross-section microstructures of the fabricated coatings were analyzed by scanning electron microscope (SEM); the compositions of the fabricated MAO coatings were analyzed by X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDAX); the corrosion behaviors of bare and MAO coated Mg-Li alloys were evaluated using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) in 3.5 wt% NaCl solution. Novel hybrid MAO coatings which showed hybrid composition of MgF2/Ti2O5/Ti6O11/MgO, as well as hybrid structure of a dense inner layer, a dense outer layer and an intermediate layer with some sealed/semi-sealed pores, had been fabricated on Mg-Li alloy in alkaline polyphosphate electrolytes with the addition of K2TiF6. Meanwhile, the corrosion resistance of the fabricated MAO coatings was improved obviously as the result of the addition of K2TiF6 in the electrolytes. Moreover, the multiple roles of on the MAO process accounted for the fabrication of the corrosion-resistant hybrid MAO coatings.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006050/abstract
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1133–1140
Titre : Improving the protective properties of La-conversion coating on α-brass surface by the combined use of La2O3 nanoparticles incorporation and electrodeposition Type de document : texte imprimé Auteurs : H. Q. Fan, Auteur ; S. Y. Li, Auteur ; Z. C. Zhao, Auteur Année de publication : 2012 Article en page(s) : pp. 1133–1140 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Brass Conversion coating Electrodeposition Lanthanum Nanoparticles Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The La2O3 nanoparticles incorporation and electrodeposition were used together to prepare the La-conversion coatings on α-brass surface in a basal solution containing rare earth salt. The results showed that both techniques can improve the protective properties of coatings. A ‘critical nano-La2O3 content’ and a ‘critical deposition potential’ were observed, under which the conversion coatings had the highest protective properties. Increased electrodeposition time improve the quality of conversion coatings. The La-conversion coatings could provide important protection against α-brass corrosion for considerable immersion periods in 3.5 wt% sodium chloride solution because it ennobled the corrosion potential and decreased the anodic current.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106231/abstract [article] Improving the protective properties of La-conversion coating on α-brass surface by the combined use of La2O3 nanoparticles incorporation and electrodeposition [texte imprimé] / H. Q. Fan, Auteur ; S. Y. Li, Auteur ; Z. C. Zhao, Auteur . - 2012 . - pp. 1133–1140.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1133–1140
Mots-clés : Brass Conversion coating Electrodeposition Lanthanum Nanoparticles Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The La2O3 nanoparticles incorporation and electrodeposition were used together to prepare the La-conversion coatings on α-brass surface in a basal solution containing rare earth salt. The results showed that both techniques can improve the protective properties of coatings. A ‘critical nano-La2O3 content’ and a ‘critical deposition potential’ were observed, under which the conversion coatings had the highest protective properties. Increased electrodeposition time improve the quality of conversion coatings. The La-conversion coatings could provide important protection against α-brass corrosion for considerable immersion periods in 3.5 wt% sodium chloride solution because it ennobled the corrosion potential and decreased the anodic current.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106231/abstract
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1141–1148
Titre : Corrosion resistance of environment-friendly sealing layer for Zn-coated sintered NdFeB magnet Type de document : texte imprimé Auteurs : F. Liu, Auteur ; Q. Li, Auteur ; X. K. Yang, Auteur Année de publication : 2012 Article en page(s) : pp. 1141–1148 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion protection Electrochemical impedance spectroscopy Potentiodynamic polarization Sintered NdFeB permanent magnet Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : In this paper, a protective sealed Zn coating (SZC) was prepared on sintered NdFeB magnet by the combination of electrodeposition and sol–gel method. The unsealed Zn coating (UZC) was also studied for a comparison. The surface morphology of UZC and the cross-section morphology of SZC were investigated using scanning election microscope (SEM). The microstructure of Zn coating and structure of sealing layer were studied by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectrum, respectively. The corrosion characteristics of SZC and UZC in neutral 3.5 wt% NaCl solution were evaluated using electrochemical measurements including open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization test, indicating that the anticorrosive properties of SZC coated specimens increased 20 times compared with that of UZC coated specimens. In order to further investigate the anticorrosive properties of SZC, a long-term immersion test was carried out in neutral 3.5 wt% NaCl solution using EIS. The results of long-term corrosion test showed that the SZC could provide long-term protection in neutral 3.5 wt% NaCl solution for NdFeB magnet.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006039/abstract [article] Corrosion resistance of environment-friendly sealing layer for Zn-coated sintered NdFeB magnet [texte imprimé] / F. Liu, Auteur ; Q. Li, Auteur ; X. K. Yang, Auteur . - 2012 . - pp. 1141–1148.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1141–1148
Mots-clés : Corrosion protection Electrochemical impedance spectroscopy Potentiodynamic polarization Sintered NdFeB permanent magnet Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : In this paper, a protective sealed Zn coating (SZC) was prepared on sintered NdFeB magnet by the combination of electrodeposition and sol–gel method. The unsealed Zn coating (UZC) was also studied for a comparison. The surface morphology of UZC and the cross-section morphology of SZC were investigated using scanning election microscope (SEM). The microstructure of Zn coating and structure of sealing layer were studied by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectrum, respectively. The corrosion characteristics of SZC and UZC in neutral 3.5 wt% NaCl solution were evaluated using electrochemical measurements including open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization test, indicating that the anticorrosive properties of SZC coated specimens increased 20 times compared with that of UZC coated specimens. In order to further investigate the anticorrosive properties of SZC, a long-term immersion test was carried out in neutral 3.5 wt% NaCl solution using EIS. The results of long-term corrosion test showed that the SZC could provide long-term protection in neutral 3.5 wt% NaCl solution for NdFeB magnet.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006039/abstract
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1149–1152
Titre : The effects of polyethylene glycol (PEG) as an electrolyte additive on the corrosion behavior and electrochemical performances of pure aluminum in an alkaline zincate solution Type de document : texte imprimé Auteurs : X. Y. Wang, Auteur ; J. M. Wang, Auteur ; Q. L. Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 1149–1152 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Alkaline solutions Aluminum Corrosion Polyethylene glycol (PEG) Zinc oxide Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The effects of zinc oxide and/or polyethylene glycol (PEG) as electrolyte additives on the corrosion and electrochemical performances of pure aluminum in 4.0 M KOH solutions were investigated by means of hydrogen collection, polarization curve, galvanostatic discharge, scanning electron microscopy (SEM), and energy dispersive analysis of X-ray (EDAX). The addition of ZnO markedly inhibited the corrosion of aluminum in 4.0 M KOH solutions, resulting from the deposition of zinc with high hydrogen evolution overpotential in aluminum surfaces. The introduction of PEG in the alkaline zincate solution obviously improved the deposition of zinc by increase in the overpotential of zinc deposition, thus the corrosion rate of aluminum in the alkaline zincate solutions with PEG was further decreased. The enhancement effect of PEG on the inhibition of zinc oxide first increased and then decreased with increasing the content of PEG in the electrolyte. The electrolyte system with 0.2 M ZnO and 2.0 mM PEG presented the highest inhibition efficiency (98.8%) for the corrosion of aluminum. The results of galvanostatic discharge indicated that the aluminum anode shows excellent discharge performances in the 4.0 M KOH solution with 0.2 M ZnO and 2.0 mM PEG.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005646/abstract [article] The effects of polyethylene glycol (PEG) as an electrolyte additive on the corrosion behavior and electrochemical performances of pure aluminum in an alkaline zincate solution [texte imprimé] / X. Y. Wang, Auteur ; J. M. Wang, Auteur ; Q. L. Wang, Auteur . - 2012 . - pp. 1149–1152.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1149–1152
Mots-clés : Alkaline solutions Aluminum Corrosion Polyethylene glycol (PEG) Zinc oxide Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The effects of zinc oxide and/or polyethylene glycol (PEG) as electrolyte additives on the corrosion and electrochemical performances of pure aluminum in 4.0 M KOH solutions were investigated by means of hydrogen collection, polarization curve, galvanostatic discharge, scanning electron microscopy (SEM), and energy dispersive analysis of X-ray (EDAX). The addition of ZnO markedly inhibited the corrosion of aluminum in 4.0 M KOH solutions, resulting from the deposition of zinc with high hydrogen evolution overpotential in aluminum surfaces. The introduction of PEG in the alkaline zincate solution obviously improved the deposition of zinc by increase in the overpotential of zinc deposition, thus the corrosion rate of aluminum in the alkaline zincate solutions with PEG was further decreased. The enhancement effect of PEG on the inhibition of zinc oxide first increased and then decreased with increasing the content of PEG in the electrolyte. The electrolyte system with 0.2 M ZnO and 2.0 mM PEG presented the highest inhibition efficiency (98.8%) for the corrosion of aluminum. The results of galvanostatic discharge indicated that the aluminum anode shows excellent discharge performances in the 4.0 M KOH solution with 0.2 M ZnO and 2.0 mM PEG.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005646/abstract
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1153–1158
Titre : Interaction of inhibitors with corrosion scale formed on N80 steel in CO2-saturated NaCl solution Type de document : texte imprimé Auteurs : D. Liu, Auteur ; Y. B. Qiu, Auteur ; Y. Tomoe, Auteur Année de publication : 2012 Article en page(s) : pp. 1153–1158 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : CO2 corrosion Corrosion scale Inhibitor N80 steel Synergistic effect Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The performance of the selected inhibitors, including thioglycolic acid (TGA), diethylenetriamine (DETA), and naphthene acid imidazolines (IM), on the bare surface of N80 steel and its scaled surface pre-corroded in CO2-saturated 1%NaCl solution was investigated by weight-loss method, electrochemical measurements using rotating cylinder electrode and surface analytical methods (SEM, XRD, and EPMA). The results indicate that there is a remarkable difference in inhibition efficiency of inhibitors on the N80 steel with and without pre-corrosion scale. The synergistic effect between inhibitors and corrosion scale not only depends on the size of inhibitor molecules, but also depends on the interaction of the inhibitor with the corrosion scale. It shows that IM and DETA have a good positive synergistic effect with the corrosion scale formed on N80 steel, although DETA has no inhibition efficiency for bare N80 steel, which can easily enter into the apertures of the corrosion scale, and block the active sites on the metal surface and the diffusion routeways of the reactant so as to depress the corrosion of the substrate metal. While TGA shows excellent inhibition efficiency on bare N80 steel, but it has an antagonistic effect with the corrosion scale although it has a small molecular weight as well as DETA, because TGA can dissolve corrosion scale and break its integrality and protectiveness performance.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106075/abstract [article] Interaction of inhibitors with corrosion scale formed on N80 steel in CO2-saturated NaCl solution [texte imprimé] / D. Liu, Auteur ; Y. B. Qiu, Auteur ; Y. Tomoe, Auteur . - 2012 . - pp. 1153–1158.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1153–1158
Mots-clés : CO2 corrosion Corrosion scale Inhibitor N80 steel Synergistic effect Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The performance of the selected inhibitors, including thioglycolic acid (TGA), diethylenetriamine (DETA), and naphthene acid imidazolines (IM), on the bare surface of N80 steel and its scaled surface pre-corroded in CO2-saturated 1%NaCl solution was investigated by weight-loss method, electrochemical measurements using rotating cylinder electrode and surface analytical methods (SEM, XRD, and EPMA). The results indicate that there is a remarkable difference in inhibition efficiency of inhibitors on the N80 steel with and without pre-corrosion scale. The synergistic effect between inhibitors and corrosion scale not only depends on the size of inhibitor molecules, but also depends on the interaction of the inhibitor with the corrosion scale. It shows that IM and DETA have a good positive synergistic effect with the corrosion scale formed on N80 steel, although DETA has no inhibition efficiency for bare N80 steel, which can easily enter into the apertures of the corrosion scale, and block the active sites on the metal surface and the diffusion routeways of the reactant so as to depress the corrosion of the substrate metal. While TGA shows excellent inhibition efficiency on bare N80 steel, but it has an antagonistic effect with the corrosion scale although it has a small molecular weight as well as DETA, because TGA can dissolve corrosion scale and break its integrality and protectiveness performance.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106075/abstract
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1159–1162
Titre : Utilizing Arghel extract as corrosion inhibitor for reinforced steel in concrete Type de document : texte imprimé Auteurs : A. M. Abdel-Gaber, Auteur ; E. Khamis, Auteur ; A. Hefnawy, Auteur Année de publication : 2012 Article en page(s) : pp. 1159–1162 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Arghel Concrete Corrosion Extract Inhibitor Steel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Inhibition of the corrosion of reinforced steel in concrete in 0.5 M NaCl by Arghel extract has been studied employing different electrochemical techniques in conjunction with optical images photo. Potential-time measurements showed that introducing of Arghel extract into concrete shifts the potential of reinforced steel to more positive values. Potentiodynamic polarization curves measurements manifested that Arghel extract acts as anodic type inhibitor. Nyquist plots were characterized by a distinct charge transfer and diffusion components. A proposed equivalent circuit was used to analyze the impedance spectra of reinforced steel in concrete in 0.5 M NaCl. Optical images for the cracked lollipops samples of the reinforced steel in concrete that is immersed in 0.5 M NaCl for 18 months showed no corrosion attack even in the presence of a low concentration of Arghel which is in good agreement with the results obtained from the electrochemical techniques.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005653/abstract [article] Utilizing Arghel extract as corrosion inhibitor for reinforced steel in concrete [texte imprimé] / A. M. Abdel-Gaber, Auteur ; E. Khamis, Auteur ; A. Hefnawy, Auteur . - 2012 . - pp. 1159–1162.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1159–1162
Mots-clés : Arghel Concrete Corrosion Extract Inhibitor Steel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Inhibition of the corrosion of reinforced steel in concrete in 0.5 M NaCl by Arghel extract has been studied employing different electrochemical techniques in conjunction with optical images photo. Potential-time measurements showed that introducing of Arghel extract into concrete shifts the potential of reinforced steel to more positive values. Potentiodynamic polarization curves measurements manifested that Arghel extract acts as anodic type inhibitor. Nyquist plots were characterized by a distinct charge transfer and diffusion components. A proposed equivalent circuit was used to analyze the impedance spectra of reinforced steel in concrete in 0.5 M NaCl. Optical images for the cracked lollipops samples of the reinforced steel in concrete that is immersed in 0.5 M NaCl for 18 months showed no corrosion attack even in the presence of a low concentration of Arghel which is in good agreement with the results obtained from the electrochemical techniques.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005653/abstract
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