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Materials and corrosion |
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Ajouter le résultat dans votre panierCorrosion of aluminium, stainless steels and AISI 680 nickel alloy in nitrogen-based fuels / I. Kap in Materials and corrosion, Vol. 63 N° 7 (Juillet 2012)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 571–579
Titre : Corrosion of aluminium, stainless steels and AISI 680 nickel alloy in nitrogen-based fuels Type de document : texte imprimé Auteurs : I. Kap, Auteur ; M. Starostin, Auteur ; G. E. Shter, Auteur Année de publication : 2012 Article en page(s) : pp. 571–579 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Ammonium nitrate urea fuels; carbon steel and aluminium; corrosion resistance; nickel alloy; non-carbon fuels; stainless steels Résumé : Nitrogen-based compounds can potentially be used as alternative non-carbon or low-carbon fuels. Nevertheless, the corrosion of construction materials at high temperatures and pressures in the presence of such fuel has not been reported yet. This work is focused on the corrosion of AISI Al 6061, 1005 carbon steel (CS), 304, 316L, 310 austenitic stainless steels (SS) and 680 nickel alloy in highly concentrated water solution of ammonium nitrate and urea (ANU). The corrosion at 50 °C and ambient pressure and at 350 °C and 20 bar was investigated to simulate storage and working conditions. Sodium chloride was added to the fuel (0–5 wt%) to simulate industrial fertilizers and accelerated corrosion environment. Heavy corrosion of CS was observed in ANU solution at 50 °C, while Al 6061, 304 and 316L SS showed high resistance both to uniform and pitting corrosion in ANU containing 1% of sodium chloride. Addition of 5% sodium chloride caused pitting of Al 6061 but had no influence on the corrosion of SS. Tests in ANU at 350 °C and 20 bar showed pitting on SS 304 and 316L and 680 nickel alloy. The highest corrosion resistance was found for SS 310 due to formation of stable oxide film on its surface. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106107/abstract [article] Corrosion of aluminium, stainless steels and AISI 680 nickel alloy in nitrogen-based fuels [texte imprimé] / I. Kap, Auteur ; M. Starostin, Auteur ; G. E. Shter, Auteur . - 2012 . - pp. 571–579.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 571–579
Mots-clés : Ammonium nitrate urea fuels; carbon steel and aluminium; corrosion resistance; nickel alloy; non-carbon fuels; stainless steels Résumé : Nitrogen-based compounds can potentially be used as alternative non-carbon or low-carbon fuels. Nevertheless, the corrosion of construction materials at high temperatures and pressures in the presence of such fuel has not been reported yet. This work is focused on the corrosion of AISI Al 6061, 1005 carbon steel (CS), 304, 316L, 310 austenitic stainless steels (SS) and 680 nickel alloy in highly concentrated water solution of ammonium nitrate and urea (ANU). The corrosion at 50 °C and ambient pressure and at 350 °C and 20 bar was investigated to simulate storage and working conditions. Sodium chloride was added to the fuel (0–5 wt%) to simulate industrial fertilizers and accelerated corrosion environment. Heavy corrosion of CS was observed in ANU solution at 50 °C, while Al 6061, 304 and 316L SS showed high resistance both to uniform and pitting corrosion in ANU containing 1% of sodium chloride. Addition of 5% sodium chloride caused pitting of Al 6061 but had no influence on the corrosion of SS. Tests in ANU at 350 °C and 20 bar showed pitting on SS 304 and 316L and 680 nickel alloy. The highest corrosion resistance was found for SS 310 due to formation of stable oxide film on its surface. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106107/abstract
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 580–585
Titre : Stability of the passive state of Zr–Nb crystalline alloys Type de document : texte imprimé Auteurs : F. Rosalbino, Auteur ; D. Macciò, Auteur ; A. Saccone, Auteur Année de publication : 2012 Article en page(s) : pp. 580–585 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Electrochemical impedance spectroscopy (EIS); passive state; pitting corrosion; potentiodynamic polarization curves; Zr–Nb alloys Résumé : Stability of the passive state was assessed for pure Zr and four Zr–Nb alloys (2.5, 5.0, 10.0, 25.0 at.% Nb) after 24 h exposure to naturally aerated 3.5% NaCl solution (pH = 6). Open circuit potential values indicated that all the Zr–Nb alloys studied and the pure Zr undergo spontaneous passivation due to spontaneously formed oxide film passivating the metallic surface. It also indicated that the addition of increasing Nb contents to pure Zr seems to improve the protection characteristics of its spontaneous oxides. Potentiodynamic polarization curves showed an increase of the breakdown potential and the extent of the passive range following an increased niobium amount in the alloy. This leads to the conclusion that a progressive increase of niobium content positively affects the localized corrosion behaviour of the Zr–Nb alloys by enhancing the electrochemical stability of the passive film. Electrochemical impedance spectroscopy (EIS) studies showed high impedance values for all the samples, and its increase on increased niobium content in the alloy indicated an improvement in the corrosion resistance of the spontaneous oxide film. The fit obtained suggests a single passive film present on the metal surface, with resistance improving with the increase of niobium amount in the alloy. All these electrochemical results show the beneficial effect of increasing niobium contents on the passive state stability of the Zr–Nb alloys. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006012/abstract [article] Stability of the passive state of Zr–Nb crystalline alloys [texte imprimé] / F. Rosalbino, Auteur ; D. Macciò, Auteur ; A. Saccone, Auteur . - 2012 . - pp. 580–585.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 580–585
Mots-clés : Electrochemical impedance spectroscopy (EIS); passive state; pitting corrosion; potentiodynamic polarization curves; Zr–Nb alloys Résumé : Stability of the passive state was assessed for pure Zr and four Zr–Nb alloys (2.5, 5.0, 10.0, 25.0 at.% Nb) after 24 h exposure to naturally aerated 3.5% NaCl solution (pH = 6). Open circuit potential values indicated that all the Zr–Nb alloys studied and the pure Zr undergo spontaneous passivation due to spontaneously formed oxide film passivating the metallic surface. It also indicated that the addition of increasing Nb contents to pure Zr seems to improve the protection characteristics of its spontaneous oxides. Potentiodynamic polarization curves showed an increase of the breakdown potential and the extent of the passive range following an increased niobium amount in the alloy. This leads to the conclusion that a progressive increase of niobium content positively affects the localized corrosion behaviour of the Zr–Nb alloys by enhancing the electrochemical stability of the passive film. Electrochemical impedance spectroscopy (EIS) studies showed high impedance values for all the samples, and its increase on increased niobium content in the alloy indicated an improvement in the corrosion resistance of the spontaneous oxide film. The fit obtained suggests a single passive film present on the metal surface, with resistance improving with the increase of niobium amount in the alloy. All these electrochemical results show the beneficial effect of increasing niobium contents on the passive state stability of the Zr–Nb alloys. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006012/abstract
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 586–592
Titre : Study of the correlation between corrosion resistance and semi-conducting properties of the passive film of AISI 316L stainless steel in physiological solution Type de document : texte imprimé Auteurs : R. A. Antunes, Auteur ; M. C. L. de Oliveira, Auteur ; I. Costa, Auteur Année de publication : 2012 Article en page(s) : pp. 586–592 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : 316L; biomaterial; EIS; Mott–Schottky Résumé : In this work the corrosion resistance of AISI 316L biomedical stainless steel was assessed through electrochemical impedance spectroscopy (EIS) measurements in Hanks' solution at 37 °C. Specimens were immersed in the electrolyte during 21 days. Semi-conducting properties of the passive film naturally formed on the surface of the metallic material during the test were evaluated through the Mott–Schottky approach. The aim was to investigate the correlation between corrosion resistance and semi-conducting properties in the physiological solution. The corrosion resistance was found to decrease with the immersion time. The density of defects in the passive film increased accordingly as indicated by the Mott–Schottky plots. The passive film presented a semi-conducting behavior with a duplex character. Above the flat band potential the behavior was typical of an n-type semiconductor whilst below such value it was typical of a p-type semiconductor. The results from EIS measurements and Mott–Schottky were in good agreement, suggesting that the corrosion resistance of biomedical stainless steels may be associated with the semi-conducting properties of the passive films formed during immersion in physiological medium. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006052/abstract [article] Study of the correlation between corrosion resistance and semi-conducting properties of the passive film of AISI 316L stainless steel in physiological solution [texte imprimé] / R. A. Antunes, Auteur ; M. C. L. de Oliveira, Auteur ; I. Costa, Auteur . - 2012 . - pp. 586–592.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 586–592
Mots-clés : 316L; biomaterial; EIS; Mott–Schottky Résumé : In this work the corrosion resistance of AISI 316L biomedical stainless steel was assessed through electrochemical impedance spectroscopy (EIS) measurements in Hanks' solution at 37 °C. Specimens were immersed in the electrolyte during 21 days. Semi-conducting properties of the passive film naturally formed on the surface of the metallic material during the test were evaluated through the Mott–Schottky approach. The aim was to investigate the correlation between corrosion resistance and semi-conducting properties in the physiological solution. The corrosion resistance was found to decrease with the immersion time. The density of defects in the passive film increased accordingly as indicated by the Mott–Schottky plots. The passive film presented a semi-conducting behavior with a duplex character. Above the flat band potential the behavior was typical of an n-type semiconductor whilst below such value it was typical of a p-type semiconductor. The results from EIS measurements and Mott–Schottky were in good agreement, suggesting that the corrosion resistance of biomedical stainless steels may be associated with the semi-conducting properties of the passive films formed during immersion in physiological medium. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006052/abstract
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 593–597
Titre : Modified EPR-DL method for detection of the spinodal decomposition of 2205 duplex stainless steel Type de document : texte imprimé Auteurs : J. Stoulil, Auteur ; J. Bystriansky, Auteur Année de publication : 2012 Article en page(s) : pp. 593–597 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Duplex stainless steel; EPR-DL; microhardness; spinodal decomposition Résumé : The presented work deals with the possibility of electrochemical detection of the spinodal decomposition of duplex stainless steel's ferritic phase using the modified electrochemical potentiodynamic reactivation double loop (EPR-DL) method. Specimens of FeCr23Ni6Mo3N (2205) steel exposed to the model low-temperature annealing at 420 °C for up to 1000 h were used in the experiment. The specimens were evaluated using potentiodynamic curves measurements in chloride solutions and microhardness measurements. Despite hardening the ferritic phase for up to 1 h, a substantial drop of resistance to attack by chlorides was reported only after 1000 h of annealing. The modified EPR-DL method in 2 M HCl + 0.1 M KSCN solution enables sensitive identification of the spinodal decomposition rate already from early stages. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106127/abstract [article] Modified EPR-DL method for detection of the spinodal decomposition of 2205 duplex stainless steel [texte imprimé] / J. Stoulil, Auteur ; J. Bystriansky, Auteur . - 2012 . - pp. 593–597.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 593–597
Mots-clés : Duplex stainless steel; EPR-DL; microhardness; spinodal decomposition Résumé : The presented work deals with the possibility of electrochemical detection of the spinodal decomposition of duplex stainless steel's ferritic phase using the modified electrochemical potentiodynamic reactivation double loop (EPR-DL) method. Specimens of FeCr23Ni6Mo3N (2205) steel exposed to the model low-temperature annealing at 420 °C for up to 1000 h were used in the experiment. The specimens were evaluated using potentiodynamic curves measurements in chloride solutions and microhardness measurements. Despite hardening the ferritic phase for up to 1 h, a substantial drop of resistance to attack by chlorides was reported only after 1000 h of annealing. The modified EPR-DL method in 2 M HCl + 0.1 M KSCN solution enables sensitive identification of the spinodal decomposition rate already from early stages. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106127/abstract
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 598–606
Titre : A new steel with good low-temperature sulfuric acid dew point corrosion resistance Type de document : texte imprimé Auteurs : X. Q. Cheng, Auteur ; F. L. Sun, Auteur ; S. J. Lv, Auteur Année de publication : 2012 Article en page(s) : pp. 598–606 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Dew point corrosion; electrochemical; ferrous metals and alloys; scanning electron microscopy; sulfuric acid Résumé : In this work, new steels (1#, 2#, and 3#) were developed for low-temperature sulfuric acid dew point corrosion. The mass loss rate, macro- and micro-morphologies and compositions of corrosion products of new steels in 10, 30, and 50% H2SO4 solutions at its corresponding dew points were investigated by immersion test, scanning electron microscopy (SEM) and energy-dispersive spectrometry (EDS). The results indicated that mass loss rate of all the tested steels first strongly increased and then decreased as H2SO4 concentration increased, which reached maximum at 30%. Corrosion resistance of 2# steel is the best among all specimens due to its fine and homogeneous morphologies of corrosion products. The electrochemical corrosion properties of new steels in 10 and 30% H2SO4 solutions at its corresponding dew points were studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results demonstrated that corrosion resistance of 2# steel is the best among all the experimental samples due to its lowest corrosion current density and highest charge transfer resistance, which is consistent with the results obtained from immersion tests. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006046/abstract [article] A new steel with good low-temperature sulfuric acid dew point corrosion resistance [texte imprimé] / X. Q. Cheng, Auteur ; F. L. Sun, Auteur ; S. J. Lv, Auteur . - 2012 . - pp. 598–606.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 598–606
Mots-clés : Dew point corrosion; electrochemical; ferrous metals and alloys; scanning electron microscopy; sulfuric acid Résumé : In this work, new steels (1#, 2#, and 3#) were developed for low-temperature sulfuric acid dew point corrosion. The mass loss rate, macro- and micro-morphologies and compositions of corrosion products of new steels in 10, 30, and 50% H2SO4 solutions at its corresponding dew points were investigated by immersion test, scanning electron microscopy (SEM) and energy-dispersive spectrometry (EDS). The results indicated that mass loss rate of all the tested steels first strongly increased and then decreased as H2SO4 concentration increased, which reached maximum at 30%. Corrosion resistance of 2# steel is the best among all specimens due to its fine and homogeneous morphologies of corrosion products. The electrochemical corrosion properties of new steels in 10 and 30% H2SO4 solutions at its corresponding dew points were studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results demonstrated that corrosion resistance of 2# steel is the best among all the experimental samples due to its lowest corrosion current density and highest charge transfer resistance, which is consistent with the results obtained from immersion tests. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006046/abstract
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 607–613
Titre : Corrosion resistance of Zn–Ni/Ni and Ni/Zn–Ni compositionally modulated multilayer coating Type de document : texte imprimé Auteurs : J.-L. Chen, Auteur ; J. H. Liu, Auteur ; S. M. Li, Auteur Année de publication : 2012 Article en page(s) : pp. 607–613 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion resistance; multilayer; Ni; Zn–Ni alloy Résumé : Zn–Ni/Ni and Ni/Zn–Ni compositionally modulated multilayer (CMM) coatings were prepared by dual-bath technique. The effects of layers number and sublayers order were studied. Specially, the effect of different sublayers thickness ratios with the same multilayer period (λ) on the corrosion resistance of the CMM coatings was investigated in detail. Results showed that the corrosion resistance of Ni/Zn–Ni (Zn–Ni alloy sublayer as the top layer) CMM coating was better than that of Zn–Ni/Ni (Ni sublayer as the top layer) CMM coating. The 6-layer CMM coating with the layer thickness ratio of Ni/Zn–Ni = 0.8:1.2 (λ = 2 µm) has the best corrosion resistance. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006022/abstract [article] Corrosion resistance of Zn–Ni/Ni and Ni/Zn–Ni compositionally modulated multilayer coating [texte imprimé] / J.-L. Chen, Auteur ; J. H. Liu, Auteur ; S. M. Li, Auteur . - 2012 . - pp. 607–613.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 607–613
Mots-clés : Corrosion resistance; multilayer; Ni; Zn–Ni alloy Résumé : Zn–Ni/Ni and Ni/Zn–Ni compositionally modulated multilayer (CMM) coatings were prepared by dual-bath technique. The effects of layers number and sublayers order were studied. Specially, the effect of different sublayers thickness ratios with the same multilayer period (λ) on the corrosion resistance of the CMM coatings was investigated in detail. Results showed that the corrosion resistance of Ni/Zn–Ni (Zn–Ni alloy sublayer as the top layer) CMM coating was better than that of Zn–Ni/Ni (Ni sublayer as the top layer) CMM coating. The 6-layer CMM coating with the layer thickness ratio of Ni/Zn–Ni = 0.8:1.2 (λ = 2 µm) has the best corrosion resistance. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006022/abstract
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 614–619
Titre : The effect of TiO2 nanoparticle codeposition on microstructure and corrosion resistance of electroless Ni-P coating Type de document : texte imprimé Auteurs : M. Momenzadeh, Auteur ; S. Sanjabi, Auteur Année de publication : 2012 Article en page(s) : pp. 614–619 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : corrosion; electroless; microhardness; Ni-P-TiO2 nanocomposite coatings Résumé : Ni-P-TiO2 nanocomposite coatings with various contents of TiO2 nanoparticles were synthesized by adding TiO2 nanoparticles to Ni-P electroless plating solution. The effects of pH and anionic surfactant sodium dodecyl sulfate (SDS) on the chemical composition of Ni, P, and TiO2 in the coatings were investigated. Scanning electron microscope (SEM), energy dispersive spectrometer (EDX), and X-ray diffractometer (XRD) were used to characterize the morphology, composition, and crystal structure of deposited coatings, respectively. The hardness of nanocomposite coatings was improved greatly compared to Ni-P coating especially after heat treatment. After heat treatment at 400 °C for 1 h, an increase in microhardness was observed for heat-treated Ni-P coatings. The hardness was increased from 805 to 1050 Hv for Ni-P-TiO2 coating deposited at 9 g/LTiO2 concentration in the bath. The corrosion resistance of Ni-P-TiO2 coating was significantly increased compared to Ni-P coatings by incorporation of TiO2 nanoparticle. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005985/abstract [article] The effect of TiO2 nanoparticle codeposition on microstructure and corrosion resistance of electroless Ni-P coating [texte imprimé] / M. Momenzadeh, Auteur ; S. Sanjabi, Auteur . - 2012 . - pp. 614–619.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 614–619
Mots-clés : corrosion; electroless; microhardness; Ni-P-TiO2 nanocomposite coatings Résumé : Ni-P-TiO2 nanocomposite coatings with various contents of TiO2 nanoparticles were synthesized by adding TiO2 nanoparticles to Ni-P electroless plating solution. The effects of pH and anionic surfactant sodium dodecyl sulfate (SDS) on the chemical composition of Ni, P, and TiO2 in the coatings were investigated. Scanning electron microscope (SEM), energy dispersive spectrometer (EDX), and X-ray diffractometer (XRD) were used to characterize the morphology, composition, and crystal structure of deposited coatings, respectively. The hardness of nanocomposite coatings was improved greatly compared to Ni-P coating especially after heat treatment. After heat treatment at 400 °C for 1 h, an increase in microhardness was observed for heat-treated Ni-P coatings. The hardness was increased from 805 to 1050 Hv for Ni-P-TiO2 coating deposited at 9 g/LTiO2 concentration in the bath. The corrosion resistance of Ni-P-TiO2 coating was significantly increased compared to Ni-P coatings by incorporation of TiO2 nanoparticle. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005985/abstract
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 620–626
Titre : Corrosion behavior of nanostructured Ni-Si3N4 composite films : a study of electrochemical impedance spectroscopy Type de document : texte imprimé Auteurs : J. M. Li, Auteur ; J. Y. Yin, Auteur ; C. Cai, Auteur Année de publication : 2012 Article en page(s) : pp. 620–626 Langues : Anglais (eng) Mots-clés : Corrosion; electrochemical impedance spectroscopy; Ni-Si3N4 nanocomposite film Résumé : Ni-Si3N4 nanocomposite films with both the consecutive Ni crystallites and dispersed Si3N4 particles in the nanometer range have been fabricated using DC electroplating technique, and characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD). The corrosion resistance of the Ni-Si3N4 nanocomposite film has been compared to that of pure Ni coating through polarization. Meanwhile, the corrosion process of Ni-Si3N4 nanocomposite film in neutral 3.5% NaCl solution has been investigated using electrochemical impedance spectroscopy (EIS). The results show that the Ni-Si3N4 nanocomposite film is more resistant to corrosion than the pure Ni coating. The corrosion of Ni-Si3N4 nanocomposite film is controlled by electrochemical step, and the whole corrosion process is divided into two sequential stages. The main corrosion type of Ni-Si3N4 nanocomposite films in neutral 3.5% NaCl solution is pitting. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005970/abstract [article] Corrosion behavior of nanostructured Ni-Si3N4 composite films : a study of electrochemical impedance spectroscopy [texte imprimé] / J. M. Li, Auteur ; J. Y. Yin, Auteur ; C. Cai, Auteur . - 2012 . - pp. 620–626.
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 620–626
Mots-clés : Corrosion; electrochemical impedance spectroscopy; Ni-Si3N4 nanocomposite film Résumé : Ni-Si3N4 nanocomposite films with both the consecutive Ni crystallites and dispersed Si3N4 particles in the nanometer range have been fabricated using DC electroplating technique, and characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD). The corrosion resistance of the Ni-Si3N4 nanocomposite film has been compared to that of pure Ni coating through polarization. Meanwhile, the corrosion process of Ni-Si3N4 nanocomposite film in neutral 3.5% NaCl solution has been investigated using electrochemical impedance spectroscopy (EIS). The results show that the Ni-Si3N4 nanocomposite film is more resistant to corrosion than the pure Ni coating. The corrosion of Ni-Si3N4 nanocomposite film is controlled by electrochemical step, and the whole corrosion process is divided into two sequential stages. The main corrosion type of Ni-Si3N4 nanocomposite films in neutral 3.5% NaCl solution is pitting. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005970/abstract
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 627–635
Titre : Inhibition investigation and determination of some quantum chemical parameters of 1-(4-(dimethylamino)benzylidene)thiosemicarbazide on steel alloys in sulfuric acid medium Type de document : texte imprimé Auteurs : S. M. A. Hosseini, Auteur ; M. J. Bahrami, Auteur ; A. Dorehgiraee, Auteur Année de publication : 2012 Article en page(s) : pp. 627–635 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Adsorption; corrosion inhibitor; Fourier transforms infrared spectroscopy; steel alloys Résumé : The inhibition effect of 1-(4-(dimethylamino)benzylidene)thiosemicarbazide (DBT) on the corrosion behavior of 304 stainless steel and mild steel in 0.5 M sulfuric acid solution was investigated using weight loss and potentiostatic polarization methods. The experimental results suggest that DBT inhibits the corrosion of the steels in acid solution. The inhibition efficiencies increased as the concentration of the compound was increased. The calculated inhibition efficiencies from the two investigated methods were in good agreement. Potentiostatic polarization measurements indicate that DBT acts as a mixed type inhibitor for both alloys. The adsorption of inhibitor on the steel surfaces obeys Langmuir adsorption isotherm. The structure of DBT was optimized using PM3 semi-empirical method. Highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), energy levels, ELUMO − EHOMO (energy gap), dipole moment (µ), and Mulliken charge densities for this molecule were computed and the adsorption mechanism was discussed. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to characterize the surfaces of the alloys. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106123/abstract [article] Inhibition investigation and determination of some quantum chemical parameters of 1-(4-(dimethylamino)benzylidene)thiosemicarbazide on steel alloys in sulfuric acid medium [texte imprimé] / S. M. A. Hosseini, Auteur ; M. J. Bahrami, Auteur ; A. Dorehgiraee, Auteur . - 2012 . - pp. 627–635.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 627–635
Mots-clés : Adsorption; corrosion inhibitor; Fourier transforms infrared spectroscopy; steel alloys Résumé : The inhibition effect of 1-(4-(dimethylamino)benzylidene)thiosemicarbazide (DBT) on the corrosion behavior of 304 stainless steel and mild steel in 0.5 M sulfuric acid solution was investigated using weight loss and potentiostatic polarization methods. The experimental results suggest that DBT inhibits the corrosion of the steels in acid solution. The inhibition efficiencies increased as the concentration of the compound was increased. The calculated inhibition efficiencies from the two investigated methods were in good agreement. Potentiostatic polarization measurements indicate that DBT acts as a mixed type inhibitor for both alloys. The adsorption of inhibitor on the steel surfaces obeys Langmuir adsorption isotherm. The structure of DBT was optimized using PM3 semi-empirical method. Highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), energy levels, ELUMO − EHOMO (energy gap), dipole moment (µ), and Mulliken charge densities for this molecule were computed and the adsorption mechanism was discussed. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to characterize the surfaces of the alloys. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106123/abstract
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 636–645
Titre : Synthesis of imidazoline-based dissymmetric bis-quaternary ammonium gemini surfactant and its inhibition mechanism on Q235 steel in hydrochloric acid medium Type de document : texte imprimé Auteurs : J. Zhang, Auteur ; X. L. Gong, Auteur ; W.-W. Song, Auteur Année de publication : 2012 Article en page(s) : pp. 636–645 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Acid inhibition; adsorption; dissymmetric bisquaternary ammonium salt; imidazoline inhabitor; quantum chemical calculations Résumé : An imidazoline-based dissymmetric bis-quaternary ammonium gemini surfactant has been synthesized. Its surface active properties at equilibrium in water at 25 °C were determined. The inhibitive effect of the compound on Q235 steel in 1 M hydrochloric solution was investigated by the weight-loss method, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) analysis, and quantum chemical calculations. The results indicate that the compound has high surface properties and the inhibition efficiency (IE) increases with the increase in inhibitor concentration, which attain the maximum value around the CMC value. The imidazoline-based dissymmetric bis-quaternary ammonium acts as a mixed type inhibitor mainly inhibiting the cathodic processes and does not change the mechanism of either hydrogen evolution reaction or mild steel dissolution. The best IE is obtained at the immersion time of 144 h. The adsorption of the studied inhibitor on Q235 steel can be fitted to a Langmuir isotherm and the adsorption process is a spontaneous chemical adsorption. Quantum chemistry calculation results show that the imidazoline ring and heteroatoms of N, O, are the active sites of the inhibitors. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006051/abstract [article] Synthesis of imidazoline-based dissymmetric bis-quaternary ammonium gemini surfactant and its inhibition mechanism on Q235 steel in hydrochloric acid medium [texte imprimé] / J. Zhang, Auteur ; X. L. Gong, Auteur ; W.-W. Song, Auteur . - 2012 . - pp. 636–645.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 7 (Juillet 2012) . - pp. 636–645
Mots-clés : Acid inhibition; adsorption; dissymmetric bisquaternary ammonium salt; imidazoline inhabitor; quantum chemical calculations Résumé : An imidazoline-based dissymmetric bis-quaternary ammonium gemini surfactant has been synthesized. Its surface active properties at equilibrium in water at 25 °C were determined. The inhibitive effect of the compound on Q235 steel in 1 M hydrochloric solution was investigated by the weight-loss method, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) analysis, and quantum chemical calculations. The results indicate that the compound has high surface properties and the inhibition efficiency (IE) increases with the increase in inhibitor concentration, which attain the maximum value around the CMC value. The imidazoline-based dissymmetric bis-quaternary ammonium acts as a mixed type inhibitor mainly inhibiting the cathodic processes and does not change the mechanism of either hydrogen evolution reaction or mild steel dissolution. The best IE is obtained at the immersion time of 144 h. The adsorption of the studied inhibitor on Q235 steel can be fitted to a Langmuir isotherm and the adsorption process is a spontaneous chemical adsorption. Quantum chemistry calculation results show that the imidazoline ring and heteroatoms of N, O, are the active sites of the inhibitors. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006051/abstract
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