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Ajouter le résultat dans votre panierMono-carboxylate conversion coatings for AZ31 Mg alloy protection / A. Frignani in Materials and corrosion, Vol. 62 N° 11 (Novembre 2011)
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 995–1002
Titre : Mono-carboxylate conversion coatings for AZ31 Mg alloy protection Type de document : texte imprimé Auteurs : A. Frignani, Auteur ; V. Grassi, Auteur ; F. Zucchi, Auteur Année de publication : 2012 Article en page(s) : pp. 995–1002 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : AZ31 Conversion coating Corrosion Magnesium alloy Mono-carboxylic acids Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Conversion coatings on a magnesium alloy were obtained by dipping AZ31 specimens in aqueous solutions of sodium salts of mono-carboxylic acids (stearic, palmitic, myristic, lauric, mono-carboxylate ion concentration from 1 to 5 mM, depending on the salt solubility) for 24 and 72 h at room temperature, or 24 h at 50 °C. The influence exerted by the treatment time, bath temperature and alkyl chain length on the efficiency of these coatings was studied.
The performances of the coatings were evaluated by potentiodynamic polarization curve recording after 1 h immersion in 0.05 M Na2SO4 solution, while their temporal evolution was monitored by electrochemical impedance spectroscopy (EIS) spectra during 24 h. Further and long lasting tests were carried out also in 0.1 M NaCl solution.
The efficiency of the coatings depended on the aliphatic chain length, and increased as the treatment time and the bath temperature were increased. The coating of lower homologue only hindered the cathodic process, while those of the higher homologues markedly inhibited the anodic process too. The best performances were displayed by 24 h-50°C stearic conversion coating, which maintained a very high efficiency for over 800 h immersion in 0.05 M sulphate solution.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905615/abstract [article] Mono-carboxylate conversion coatings for AZ31 Mg alloy protection [texte imprimé] / A. Frignani, Auteur ; V. Grassi, Auteur ; F. Zucchi, Auteur . - 2012 . - pp. 995–1002.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 995–1002
Mots-clés : AZ31 Conversion coating Corrosion Magnesium alloy Mono-carboxylic acids Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Conversion coatings on a magnesium alloy were obtained by dipping AZ31 specimens in aqueous solutions of sodium salts of mono-carboxylic acids (stearic, palmitic, myristic, lauric, mono-carboxylate ion concentration from 1 to 5 mM, depending on the salt solubility) for 24 and 72 h at room temperature, or 24 h at 50 °C. The influence exerted by the treatment time, bath temperature and alkyl chain length on the efficiency of these coatings was studied.
The performances of the coatings were evaluated by potentiodynamic polarization curve recording after 1 h immersion in 0.05 M Na2SO4 solution, while their temporal evolution was monitored by electrochemical impedance spectroscopy (EIS) spectra during 24 h. Further and long lasting tests were carried out also in 0.1 M NaCl solution.
The efficiency of the coatings depended on the aliphatic chain length, and increased as the treatment time and the bath temperature were increased. The coating of lower homologue only hindered the cathodic process, while those of the higher homologues markedly inhibited the anodic process too. The best performances were displayed by 24 h-50°C stearic conversion coating, which maintained a very high efficiency for over 800 h immersion in 0.05 M sulphate solution.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905615/abstract
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1003–1007
Titre : Electrochemical corrosion behavior of electroless Ni–P coating in NaCl and H2SO4 solutions Type de document : texte imprimé Auteurs : L. L. Wang, Auteur ; H. J. Chen, Auteur ; L. Hao, Auteur Année de publication : 2012 Article en page(s) : pp. 1003–1007 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion behavior EIS Electrochemical test Electroless Ni–P coating H2SO4 NaCl Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Electrochemical corrosion behavior of electroless Ni–P coating in NaCl and H2SO4 solutions were studied by potentiodynamic polarization curves and electrochemical impedance spectra techniques, as well as the corrosion morphology was characterized. The results indicate that electroless Ni–P coating with about 25 µm is stable in 30 days immersion in NaCl solution. Although it was corroded with prolonged immersion days, the corrosive medium has not penetrated through the coating. During the H2SO4 concentration ranging from 5 to 10%, the corrosion current density of electroless Ni–P coating increased due to the intensified anodic dissolution process; in 15% H2SO4 solution, electroless Ni–P coating shows obvious anodic passivation effect
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905575/abstract [article] Electrochemical corrosion behavior of electroless Ni–P coating in NaCl and H2SO4 solutions [texte imprimé] / L. L. Wang, Auteur ; H. J. Chen, Auteur ; L. Hao, Auteur . - 2012 . - pp. 1003–1007.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1003–1007
Mots-clés : Corrosion behavior EIS Electrochemical test Electroless Ni–P coating H2SO4 NaCl Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Electrochemical corrosion behavior of electroless Ni–P coating in NaCl and H2SO4 solutions were studied by potentiodynamic polarization curves and electrochemical impedance spectra techniques, as well as the corrosion morphology was characterized. The results indicate that electroless Ni–P coating with about 25 µm is stable in 30 days immersion in NaCl solution. Although it was corroded with prolonged immersion days, the corrosive medium has not penetrated through the coating. During the H2SO4 concentration ranging from 5 to 10%, the corrosion current density of electroless Ni–P coating increased due to the intensified anodic dissolution process; in 15% H2SO4 solution, electroless Ni–P coating shows obvious anodic passivation effect
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905575/abstract
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp.1008–1014
Titre : Study on corrosive electrochemical behaviors of zinc-rich and graphite-filled epoxy coatings in 3.5 wt% NaCl solution Type de document : texte imprimé Auteurs : J. Liu, Auteur ; F. Wang, Auteur ; K. C. Park, Auteur Année de publication : 2012 Article en page(s) : pp.1008–1014 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosive behaviors EIS Epoxy coatings Mechanisms Seawater Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Environment behaviors and degradation mechanisms of two organic epoxy coatings coated on carbon steel sheets in 3.5 wt% NaCl neutral solution were studied by electrochemical impedance measurements and atomic force microscopy (AFM). The results showed that the coating resistance (Rp) of the graphite-filled epoxy coating tested, which presents the film barrier performance, is higher than those of 6101 epoxy resin for initial seawater immersion, but the coating resistance of the zinc-rich epoxy coating was lower than that of 6101 epoxy resin. After salt spray tests, zinc-rich epoxy coating coated on the metal still has good anti-corrosion performances due to the existence of protection effects called “electrochemical” and “chemical” protection. Those behaviors and degradation mechanisms of two coatings can be explained by a series of measured electrochemical impedance spectroscopy measurements, and two equivalent circuit models were proposed to explain the degradation processes of the two organic coatings.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905517/abstract [article] Study on corrosive electrochemical behaviors of zinc-rich and graphite-filled epoxy coatings in 3.5 wt% NaCl solution [texte imprimé] / J. Liu, Auteur ; F. Wang, Auteur ; K. C. Park, Auteur . - 2012 . - pp.1008–1014.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp.1008–1014
Mots-clés : Corrosive behaviors EIS Epoxy coatings Mechanisms Seawater Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Environment behaviors and degradation mechanisms of two organic epoxy coatings coated on carbon steel sheets in 3.5 wt% NaCl neutral solution were studied by electrochemical impedance measurements and atomic force microscopy (AFM). The results showed that the coating resistance (Rp) of the graphite-filled epoxy coating tested, which presents the film barrier performance, is higher than those of 6101 epoxy resin for initial seawater immersion, but the coating resistance of the zinc-rich epoxy coating was lower than that of 6101 epoxy resin. After salt spray tests, zinc-rich epoxy coating coated on the metal still has good anti-corrosion performances due to the existence of protection effects called “electrochemical” and “chemical” protection. Those behaviors and degradation mechanisms of two coatings can be explained by a series of measured electrochemical impedance spectroscopy measurements, and two equivalent circuit models were proposed to explain the degradation processes of the two organic coatings.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905517/abstract
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1015–1030
Titre : Surface active and thermodynamic properties of some surfactants derived from locally linear and heavy alkyl benzene in relation to corrosion inhibition efficiency Type de document : texte imprimé Auteurs : A. M. Al-Sabagh, Auteur ; H. M. Abd El Bary, Auteur ; R. A. El-Ghazawy, Auteur Année de publication : 2012 Article en page(s) : pp. 1015–1030 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Adsorption Corrosion inhibitors Quaternary ammonium salts Surface active properties Surfactant Thermodynamic Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Linear and heavy alkyl benzene (HAB) were sulfonated with fuming sulfuric acid (oleum) and the sulfonated products were esterified with tri and poly ethanolamine (d = 4 and 6). The prepared three esters from each series were quaternized with n-butyl bromide. The resulted six quaternized ester of linear and HAB sulfonate were named as (L1Q, L2Q, L3Q, H1Q, H2Q, and H3Q). The surface and thermodynamic properties of these compounds have been investigated. From the data obtained, it was found that surface tension and surface active properties for the HAB derivatives were better than which obtained from linear alkyl benzene (LAB) derivatives. From the results obtained from the surface activity, the best performance compound from each group was selected to study the corrosion inhibition efficiency of them relative to the surface activity. The obtained results show that the LAB derivative L3Q exhibited inhibition efficiency (93.1%) at 1000 ppm but H3Q exhibited (97%) at 600 ppm. The diversity of the resulted data obtained was discussed in the light of chemical structure of the alkyl benzene sulfonate.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006017/abstract [article] Surface active and thermodynamic properties of some surfactants derived from locally linear and heavy alkyl benzene in relation to corrosion inhibition efficiency [texte imprimé] / A. M. Al-Sabagh, Auteur ; H. M. Abd El Bary, Auteur ; R. A. El-Ghazawy, Auteur . - 2012 . - pp. 1015–1030.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1015–1030
Mots-clés : Adsorption Corrosion inhibitors Quaternary ammonium salts Surface active properties Surfactant Thermodynamic Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Linear and heavy alkyl benzene (HAB) were sulfonated with fuming sulfuric acid (oleum) and the sulfonated products were esterified with tri and poly ethanolamine (d = 4 and 6). The prepared three esters from each series were quaternized with n-butyl bromide. The resulted six quaternized ester of linear and HAB sulfonate were named as (L1Q, L2Q, L3Q, H1Q, H2Q, and H3Q). The surface and thermodynamic properties of these compounds have been investigated. From the data obtained, it was found that surface tension and surface active properties for the HAB derivatives were better than which obtained from linear alkyl benzene (LAB) derivatives. From the results obtained from the surface activity, the best performance compound from each group was selected to study the corrosion inhibition efficiency of them relative to the surface activity. The obtained results show that the LAB derivative L3Q exhibited inhibition efficiency (93.1%) at 1000 ppm but H3Q exhibited (97%) at 600 ppm. The diversity of the resulted data obtained was discussed in the light of chemical structure of the alkyl benzene sulfonate.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006017/abstract
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1031–1041
Titre : Electrochemical, quantum chemical, and molecular dynamics studies on the interaction of 4-amino-4H,3,5-di(methoxy)-1,2,4-triazole (ATD), BATD, and DBATD on copper metal in 1N H2SO4 Type de document : texte imprimé Auteurs : S. John, Auteur ; J. Joy, Auteur ; M. Prajila, Auteur Année de publication : 2012 Article en page(s) : pp. 1031–1041 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Copper Corrosion inhibitor DFT EIS Molecular dynamics Tafel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The interaction of 4-amino-4H,3,5-di(methoxy)-1,2,4-triazole (ATD), (4-(benzylideneamino)-4H-1,2,4-triazole-3,5-diyl) dimethanol (BATD), and (4-(4-(dimethylamino) benzylideneamino))-4H-1,2,4-triazole-3,5-diyl) dimethanol (DBATD) on copper in 1 N sulfuric acid was investigated by potentiodynamic polarization (Tafel), ac impedance (EIS), molecular dynamic (MD) studies, and quantum chemical calculations at 300 K. Polarization studies clearly showed that ATD, BATD, and DBATD act as mixed type inhibitors. As the electron density around the inhibitor molecule increases due to substitution, the inhibition efficiency also increases correspondingly. Quantum chemical approach was used to calculate some electronic properties of these molecules to ascertain the correlation between inhibitive effect and molecular structure. Both the experimental and theoretical studies agree well in this regard and confirm that DBATD is having a better interaction with the metal surface in 1 N sulfuric acid than BATD and ATD. The adsorption behaviors of these molecules on the copper surface have been studied using MDs method and density functional theory.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005938/abstract [article] Electrochemical, quantum chemical, and molecular dynamics studies on the interaction of 4-amino-4H,3,5-di(methoxy)-1,2,4-triazole (ATD), BATD, and DBATD on copper metal in 1N H2SO4 [texte imprimé] / S. John, Auteur ; J. Joy, Auteur ; M. Prajila, Auteur . - 2012 . - pp. 1031–1041.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1031–1041
Mots-clés : Copper Corrosion inhibitor DFT EIS Molecular dynamics Tafel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The interaction of 4-amino-4H,3,5-di(methoxy)-1,2,4-triazole (ATD), (4-(benzylideneamino)-4H-1,2,4-triazole-3,5-diyl) dimethanol (BATD), and (4-(4-(dimethylamino) benzylideneamino))-4H-1,2,4-triazole-3,5-diyl) dimethanol (DBATD) on copper in 1 N sulfuric acid was investigated by potentiodynamic polarization (Tafel), ac impedance (EIS), molecular dynamic (MD) studies, and quantum chemical calculations at 300 K. Polarization studies clearly showed that ATD, BATD, and DBATD act as mixed type inhibitors. As the electron density around the inhibitor molecule increases due to substitution, the inhibition efficiency also increases correspondingly. Quantum chemical approach was used to calculate some electronic properties of these molecules to ascertain the correlation between inhibitive effect and molecular structure. Both the experimental and theoretical studies agree well in this regard and confirm that DBATD is having a better interaction with the metal surface in 1 N sulfuric acid than BATD and ATD. The adsorption behaviors of these molecules on the copper surface have been studied using MDs method and density functional theory.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005938/abstract
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1042–1050
Titre : Experimental and quantum chemical studies on two triazole derivatives as corrosion inhibitors for mild steel in acid media Type de document : texte imprimé Auteurs : W. Li, Auteur ; L. Hu, Auteur ; Z. Tao, Auteur Année de publication : 2012 Article en page(s) : pp. 1042–1050 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Ab initio calculations Corrosion inhibition;mild steel Surface properties Triazole derivative Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Two triazole derivatives [1-phenyl-2-(5-(1,2,4) triazol-1-ylmethyl-(1,3,4) oxadizaol-2-ylsulphanyl)-ethanone (PTOE) and 2-(4-tert-butyl-benzylsulphanyl)-5-(1,2,4) triazol-1-ylmethyl-(1,3,4) oxadiazole (TBTO)] were synthesized as new corrosion inhibitors for the corrosion of mild steel in 1 M hydrochloric acid solutions. The inhibiting efficiency of the different inhibitors was evaluated by means of weight loss and electrochemical techniques such as electrochemical impedance spectroscopy (EIS) and polarization curves. The electrochemical investigation results indicate that these compounds act as mixed-type inhibitors retarding the anodic and cathodic corrosion reactions and do not change the mechanism of either hydrogen evolution reaction or mild steel dissolution. The studied compounds followed the Langmuir adsorption isotherm, and the thermodynamic parameters were determined and discussed. The effect of molecular structure on the inhibition efficiency has been investigated with ab initio calculations. The electronic properties such as highest occupied molecular orbital (HOMO) energy level, lowest unoccupied molecular orbital (LUMO) energy level, dipole moment (µ) and molecular orbital densities were calculated.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005965/abstract [article] Experimental and quantum chemical studies on two triazole derivatives as corrosion inhibitors for mild steel in acid media [texte imprimé] / W. Li, Auteur ; L. Hu, Auteur ; Z. Tao, Auteur . - 2012 . - pp. 1042–1050.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1042–1050
Mots-clés : Ab initio calculations Corrosion inhibition;mild steel Surface properties Triazole derivative Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Two triazole derivatives [1-phenyl-2-(5-(1,2,4) triazol-1-ylmethyl-(1,3,4) oxadizaol-2-ylsulphanyl)-ethanone (PTOE) and 2-(4-tert-butyl-benzylsulphanyl)-5-(1,2,4) triazol-1-ylmethyl-(1,3,4) oxadiazole (TBTO)] were synthesized as new corrosion inhibitors for the corrosion of mild steel in 1 M hydrochloric acid solutions. The inhibiting efficiency of the different inhibitors was evaluated by means of weight loss and electrochemical techniques such as electrochemical impedance spectroscopy (EIS) and polarization curves. The electrochemical investigation results indicate that these compounds act as mixed-type inhibitors retarding the anodic and cathodic corrosion reactions and do not change the mechanism of either hydrogen evolution reaction or mild steel dissolution. The studied compounds followed the Langmuir adsorption isotherm, and the thermodynamic parameters were determined and discussed. The effect of molecular structure on the inhibition efficiency has been investigated with ab initio calculations. The electronic properties such as highest occupied molecular orbital (HOMO) energy level, lowest unoccupied molecular orbital (LUMO) energy level, dipole moment (µ) and molecular orbital densities were calculated.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005965/abstract
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1051–1060
Titre : Corrosion–erosion wear of N80 carbon steel and 316L stainless steel in saline–quartz slurry Type de document : texte imprimé Auteurs : H. Li, Auteur ; Y. H. Liu, Auteur ; Y. Z. Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 1051–1060 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : 3D ultra-deep microscopy 316lL N80 SEM Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion–erosion behavior of carbon steel N80 and austenitic stainless 316L are investigated both in water–quartz slurry and saline–quartz slurry. The sample mass losses after each test and the roughness of sample surfaces are measured and a potentiostat is used to gain the polarization curves. The worn surfaces and the corrosion–erosion wear mechanism are analyzed using scanning electron microscopy (SEM) and 3D ultra-deep microscopy. Results show that the Ra for N80 is much larger than 316L under the same experimental condition, and the weight losses of the two materials show a similar trend except for tests with higher impact angles. The lowest Rsm for 316L matches along with the highest Rsm for N80 at the 45 min testing time. According to the obtained results of the corrosion–erosion mechanism of the N80 and 316L based on the SEM and 3D ultra-deep microscopy, the conclusion is drawn that the ploughing and crashing are the major mechanisms for the forming of surface morphologies and the mass removal. Different impact angles and materials affect the corrosion–erosion process to some extent.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106086/abstract [article] Corrosion–erosion wear of N80 carbon steel and 316L stainless steel in saline–quartz slurry [texte imprimé] / H. Li, Auteur ; Y. H. Liu, Auteur ; Y. Z. Wang, Auteur . - 2012 . - pp. 1051–1060.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1051–1060
Mots-clés : 3D ultra-deep microscopy 316lL N80 SEM Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion–erosion behavior of carbon steel N80 and austenitic stainless 316L are investigated both in water–quartz slurry and saline–quartz slurry. The sample mass losses after each test and the roughness of sample surfaces are measured and a potentiostat is used to gain the polarization curves. The worn surfaces and the corrosion–erosion wear mechanism are analyzed using scanning electron microscopy (SEM) and 3D ultra-deep microscopy. Results show that the Ra for N80 is much larger than 316L under the same experimental condition, and the weight losses of the two materials show a similar trend except for tests with higher impact angles. The lowest Rsm for 316L matches along with the highest Rsm for N80 at the 45 min testing time. According to the obtained results of the corrosion–erosion mechanism of the N80 and 316L based on the SEM and 3D ultra-deep microscopy, the conclusion is drawn that the ploughing and crashing are the major mechanisms for the forming of surface morphologies and the mass removal. Different impact angles and materials affect the corrosion–erosion process to some extent.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106086/abstract
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1061–1065
Titre : The comparison of the corrosion resistance of advanced ferromagnetic stainless steels by Mott–Schottky approach Type de document : texte imprimé Auteurs : M. Terada, Auteur ; R. A. Marques, Auteur ; A. M. Saliba-Silva, Auteur Année de publication : 2012 Article en page(s) : pp. 1061–1065 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion Dental prosthesis DIN 1.4575 Dyna EFM 17-4 PH PM2000 Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Ferromagnetic stainless steels (SSs) have been investigated as potential candidates for dental prosthesis applications in replacement of magnetic attachments made of noble and expensive alloys. In order to be used as biomaterials, their corrosion resistance has to be appropriate. The corrosion resistance of passive materials is related to the characteristics of the passive film formed and their properties might be investigated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves, and Mott–Schottky approach. The corrosion resistance and the capacitance of the passive films formed on PM2000, DIN 1.4575, and 17-4 PH advanced SSs during 2 days of immersion in a phosphate buffered saline solution (PBS), at 25 °C and pH 7.0 were studied by electrochemical techniques. A commercial alloy Dyna EFM was also analyzed for comparison reasons. The results showed that films on tested materials behave as both n-type and p-type semiconductors and the PM2000 presented the highest corrosion resistance among all of them.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905594/abstract [article] The comparison of the corrosion resistance of advanced ferromagnetic stainless steels by Mott–Schottky approach [texte imprimé] / M. Terada, Auteur ; R. A. Marques, Auteur ; A. M. Saliba-Silva, Auteur . - 2012 . - pp. 1061–1065.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1061–1065
Mots-clés : Corrosion Dental prosthesis DIN 1.4575 Dyna EFM 17-4 PH PM2000 Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Ferromagnetic stainless steels (SSs) have been investigated as potential candidates for dental prosthesis applications in replacement of magnetic attachments made of noble and expensive alloys. In order to be used as biomaterials, their corrosion resistance has to be appropriate. The corrosion resistance of passive materials is related to the characteristics of the passive film formed and their properties might be investigated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves, and Mott–Schottky approach. The corrosion resistance and the capacitance of the passive films formed on PM2000, DIN 1.4575, and 17-4 PH advanced SSs during 2 days of immersion in a phosphate buffered saline solution (PBS), at 25 °C and pH 7.0 were studied by electrochemical techniques. A commercial alloy Dyna EFM was also analyzed for comparison reasons. The results showed that films on tested materials behave as both n-type and p-type semiconductors and the PM2000 presented the highest corrosion resistance among all of them.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905594/abstract
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1066–1073
Titre : Towards the development of a corrosion map for Abu Dhabi Type de document : texte imprimé Auteurs : W. D. Ganther, Auteur ; I. S. Cole, Auteur ; A. M. Helal, Auteur Année de publication : 2012 Article en page(s) : pp. 1066–1073 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Abu Dhabi Atmospheric corrosionmodelling Steel UAE Zinc Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Infrastructure development in the United Arab Emirates continues to escalate, yet very few corrosion studies have been performed in the region. In a step to address this situation, this paper reports on a study of zinc and steel corrosion and salt deposition rates at five sites in the Emirate of Abu Dhabi. The sites are classified as either urban/marine, marine, inland or mountainous. The study found that zinc corrosion rates range from 15 µm/year on the coast to 0.6 µm/year inland, while steel corrosion rates are 56 and 10 µm/year, respectively, at the same locations. While the salt deposition rate ranges from 5 to 18 mg/m2/day, it is not directly related to distance from the coast. Although the salt deposition rates observed are consistent with those at locations at similar latitudes, the corrosion rates are higher than in locations with comparable salt deposition rates. However, when the data were analysed along with relevant local meteorological data, it was found to be consistent with the basic assumptions of the holistic model of atmospheric corrosion developed by Cole et al. In particular, it is suggested that the relatively high corrosion rates observed here are associated with a greater accumulation of salt, which can occur in Abu Dhabi because rainfall, and thus rain washing, is extremely low compared to similar exposure locations in Australia and South-East Asia.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005816/abstract [article] Towards the development of a corrosion map for Abu Dhabi [texte imprimé] / W. D. Ganther, Auteur ; I. S. Cole, Auteur ; A. M. Helal, Auteur . - 2012 . - pp. 1066–1073.
Génie Mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1066–1073
Mots-clés : Abu Dhabi Atmospheric corrosionmodelling Steel UAE Zinc Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Infrastructure development in the United Arab Emirates continues to escalate, yet very few corrosion studies have been performed in the region. In a step to address this situation, this paper reports on a study of zinc and steel corrosion and salt deposition rates at five sites in the Emirate of Abu Dhabi. The sites are classified as either urban/marine, marine, inland or mountainous. The study found that zinc corrosion rates range from 15 µm/year on the coast to 0.6 µm/year inland, while steel corrosion rates are 56 and 10 µm/year, respectively, at the same locations. While the salt deposition rate ranges from 5 to 18 mg/m2/day, it is not directly related to distance from the coast. Although the salt deposition rates observed are consistent with those at locations at similar latitudes, the corrosion rates are higher than in locations with comparable salt deposition rates. However, when the data were analysed along with relevant local meteorological data, it was found to be consistent with the basic assumptions of the holistic model of atmospheric corrosion developed by Cole et al. In particular, it is suggested that the relatively high corrosion rates observed here are associated with a greater accumulation of salt, which can occur in Abu Dhabi because rainfall, and thus rain washing, is extremely low compared to similar exposure locations in Australia and South-East Asia.
DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005816/abstract
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