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Ajouter le résultat dans votre panierDetection and characterisation of intergranular stress-corrosion cracking on austenitic stainless steel / J. Kovac in Materials and corrosion, Vol. 63 N° 8 (Août 2012)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 664–673
Titre : Detection and characterisation of intergranular stress-corrosion cracking on austenitic stainless steel Type de document : texte imprimé Auteurs : J. Kovac, Auteur ; T. J. Marrow, Auteur ; E. Govekar, Auteur Année de publication : 2013 Article en page(s) : pp. 664–673 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Acoustic emission; austenitic stainless steel; digital image correlation; electrochemical noise; stress-corrosion cracking Résumé : Intergranular stress-corrosion cracking (IGSCC) on a sensitised type AISI 304 stainless steel specimen was monitored simultaneously by acoustic emission, electrochemical noise, elongation measurements and a digital imaging system. The specimen was exposed to an aqueous sodium thiosulphate solution in combination with a constant load. It was established that before the final fracture two large cracks and numerous smaller cracks had developed. Detection and characterisation of the stress-corrosion processes which generated these cracks are discussed. The results confirm and generalise previously established correlations between various parameters obtained by the implemented characterisation methods and IGSCC processes. Additionally, a clear differentiation between crack related and crack non-related AE signals was made based on an analysis of the AE signals. The relationship between the crack lengths calculated by means of digital image correlation analysis and the electrochemical current noise was also established. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106182/abstract [article] Detection and characterisation of intergranular stress-corrosion cracking on austenitic stainless steel [texte imprimé] / J. Kovac, Auteur ; T. J. Marrow, Auteur ; E. Govekar, Auteur . - 2013 . - pp. 664–673.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 664–673
Mots-clés : Acoustic emission; austenitic stainless steel; digital image correlation; electrochemical noise; stress-corrosion cracking Résumé : Intergranular stress-corrosion cracking (IGSCC) on a sensitised type AISI 304 stainless steel specimen was monitored simultaneously by acoustic emission, electrochemical noise, elongation measurements and a digital imaging system. The specimen was exposed to an aqueous sodium thiosulphate solution in combination with a constant load. It was established that before the final fracture two large cracks and numerous smaller cracks had developed. Detection and characterisation of the stress-corrosion processes which generated these cracks are discussed. The results confirm and generalise previously established correlations between various parameters obtained by the implemented characterisation methods and IGSCC processes. Additionally, a clear differentiation between crack related and crack non-related AE signals was made based on an analysis of the AE signals. The relationship between the crack lengths calculated by means of digital image correlation analysis and the electrochemical current noise was also established. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106182/abstract
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 674–684
Titre : Steam oxidation of X20CrMoV121 : comparison of laboratory exposures and in situ exposure in power plants Type de document : texte imprimé Auteurs : M. Montgomery, Auteur ; A. N. Hansson, Auteur ; T. Vilhelmsen, Auteur Année de publication : 2013 Article en page(s) : pp. 674–684 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Cr diffusion; power plants; steam oxidation; X20 Résumé : X20CrMoV121 is a 12% Cr martensitic steel which has been used in power plants in Europe for many decades. Specimens have been removed from superheater tubes to investigate long-term exposure with respect to steam oxidation. These tubes have been exposed for various durations up to 135 000 h in power plants in Denmark at steam temperatures varying from 450–565 °C. This paper collates the data, compares oxide morphologies and assesses to what extent parabolic kinetics can be used to describe the oxidation rate. The steam oxidation behaviour has been investigated in the laboratory in an Ar-46%H2O mixture at 500, 600 and 700 °C for 336 h. It was observed that the morphology of the oxide layers was strongly influenced by temperature, and some of the same morphologies are also observed for power plant specimens. However, the temperatures at which they occur were different for plant and laboratory specimens, e.g. the presence of Cr rich bands within the oxide occurred at a lower temperature in the plant than in the laboratory. In addition there is a greater variety of oxide morphologies for long-term plant specimens compared to laboratory specimens. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106063/abstract [article] Steam oxidation of X20CrMoV121 : comparison of laboratory exposures and in situ exposure in power plants [texte imprimé] / M. Montgomery, Auteur ; A. N. Hansson, Auteur ; T. Vilhelmsen, Auteur . - 2013 . - pp. 674–684.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 674–684
Mots-clés : Cr diffusion; power plants; steam oxidation; X20 Résumé : X20CrMoV121 is a 12% Cr martensitic steel which has been used in power plants in Europe for many decades. Specimens have been removed from superheater tubes to investigate long-term exposure with respect to steam oxidation. These tubes have been exposed for various durations up to 135 000 h in power plants in Denmark at steam temperatures varying from 450–565 °C. This paper collates the data, compares oxide morphologies and assesses to what extent parabolic kinetics can be used to describe the oxidation rate. The steam oxidation behaviour has been investigated in the laboratory in an Ar-46%H2O mixture at 500, 600 and 700 °C for 336 h. It was observed that the morphology of the oxide layers was strongly influenced by temperature, and some of the same morphologies are also observed for power plant specimens. However, the temperatures at which they occur were different for plant and laboratory specimens, e.g. the presence of Cr rich bands within the oxide occurred at a lower temperature in the plant than in the laboratory. In addition there is a greater variety of oxide morphologies for long-term plant specimens compared to laboratory specimens. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106063/abstract
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 685–694
Titre : Corrosion of high-velocity oxy-fuel (HVOF) sprayed iron-based amorphous metallic coatings for marine pump in sodium chloride solutions Type de document : texte imprimé Auteurs : Y. Wang, Auteur ; Y. G. Zheng, Auteur ; W. Ke, Auteur Année de publication : 2013 Article en page(s) : pp. 685–694 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Amorphous structures; EIS; metallic coatings; passivity; polarization; stainless steel Résumé : FeCrMoMnWBCSi amorphous metallic coatings (AMCs) were deposited onto the 304 stainless steel (base material of pump impeller operated in sand-containing seawater) by high-velocity oxygen-fuel (HVOF) thermal spray. The preparation, microstructural characteristics, and static corrosion behavior of the AMCs were presented. The microstructure and corrosion behavior of the AMCs were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and electrochemical methods. Melt-spun ribbon and 304 stainless steel were also used for comparison purposes. The results indicated that the AMCs can spontaneously passivate with a wide passive region, and much higher ability to withstand pitting corrosion than that of the 304 stainless steel for the high pitting resistance equivalent value. The passive current density of the AMCs was at least two orders of magnitude higher than the counterpart ribbon, which showed a slightly decreased uniform corrosion resistance of the AMCs due to the incompact structure and porosity. The corrosion resistance of the AMCs increased with the coating thickness and decreased with the concentration of NaCl solution. A stable passivation ability held in the AMCs endowed them suitably used in marine environments. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106211/abstract [article] Corrosion of high-velocity oxy-fuel (HVOF) sprayed iron-based amorphous metallic coatings for marine pump in sodium chloride solutions [texte imprimé] / Y. Wang, Auteur ; Y. G. Zheng, Auteur ; W. Ke, Auteur . - 2013 . - pp. 685–694.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 685–694
Mots-clés : Amorphous structures; EIS; metallic coatings; passivity; polarization; stainless steel Résumé : FeCrMoMnWBCSi amorphous metallic coatings (AMCs) were deposited onto the 304 stainless steel (base material of pump impeller operated in sand-containing seawater) by high-velocity oxygen-fuel (HVOF) thermal spray. The preparation, microstructural characteristics, and static corrosion behavior of the AMCs were presented. The microstructure and corrosion behavior of the AMCs were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and electrochemical methods. Melt-spun ribbon and 304 stainless steel were also used for comparison purposes. The results indicated that the AMCs can spontaneously passivate with a wide passive region, and much higher ability to withstand pitting corrosion than that of the 304 stainless steel for the high pitting resistance equivalent value. The passive current density of the AMCs was at least two orders of magnitude higher than the counterpart ribbon, which showed a slightly decreased uniform corrosion resistance of the AMCs due to the incompact structure and porosity. The corrosion resistance of the AMCs increased with the coating thickness and decreased with the concentration of NaCl solution. A stable passivation ability held in the AMCs endowed them suitably used in marine environments. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106211/abstract
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 695–702
Titre : The morphology and corrosion resistance of electrodeposited Co-TiO2 nanocomposite coatings Type de document : texte imprimé Auteurs : S. Sanjabi, Auteur ; A. Shirani, Auteur Année de publication : 2013 Article en page(s) : pp. 695–702 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion behavior; Co-TiO2; electrodeposition; nanocomposite coatings Résumé : Co-TiO2 nanocomposite coatings with various contents of TiO2 nanoparticles were prepared by electrodeposition in Co sulfate plating bath containing TiO2 nanoparticles. The influence of the TiO2 nanoparticles concentration in the bath, of the current density and of sodium dodecyle sulfate (SDS) as anionic surfactant on the morphology, composition, texture, roughness, and microhardness of the coatings was investigated. The morphology and composition of coatings were studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The phase structure of coatings was analyzed by X-ray diffraction (XRD). The results showed that the maximum codeposition of TiO2 nanoparticles in Co matrix was around 4.5 vol% obtained in 60 g/L TiO2 in the bath, 30 mA/cm2 and 0.15 g/L SDS. The microhardness of coatings was increased up to 504 Hv by increasing TiO2 concentration in the bath to 60 g/L TiO2. The electrochemistry tests including potentiodynamic polarization and impedance spectroscopy revealed that by addition of TiO2 into Co matrix, the corrosion current density, polarization resistance, and charge transfer resistance of Co-TiO2 coating were increased compared with Co coating. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106087/abstract [article] The morphology and corrosion resistance of electrodeposited Co-TiO2 nanocomposite coatings [texte imprimé] / S. Sanjabi, Auteur ; A. Shirani, Auteur . - 2013 . - pp. 695–702.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 695–702
Mots-clés : Corrosion behavior; Co-TiO2; electrodeposition; nanocomposite coatings Résumé : Co-TiO2 nanocomposite coatings with various contents of TiO2 nanoparticles were prepared by electrodeposition in Co sulfate plating bath containing TiO2 nanoparticles. The influence of the TiO2 nanoparticles concentration in the bath, of the current density and of sodium dodecyle sulfate (SDS) as anionic surfactant on the morphology, composition, texture, roughness, and microhardness of the coatings was investigated. The morphology and composition of coatings were studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The phase structure of coatings was analyzed by X-ray diffraction (XRD). The results showed that the maximum codeposition of TiO2 nanoparticles in Co matrix was around 4.5 vol% obtained in 60 g/L TiO2 in the bath, 30 mA/cm2 and 0.15 g/L SDS. The microhardness of coatings was increased up to 504 Hv by increasing TiO2 concentration in the bath to 60 g/L TiO2. The electrochemistry tests including potentiodynamic polarization and impedance spectroscopy revealed that by addition of TiO2 into Co matrix, the corrosion current density, polarization resistance, and charge transfer resistance of Co-TiO2 coating were increased compared with Co coating. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106087/abstract
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 703–706
Titre : Photocathodic protection properties of NiP/TiO2 bilayer coatings by a combined electroless plating and sol–gel method Type de document : texte imprimé Auteurs : M.-J. Zhou, Auteur ; N. Zhang, Auteur ; Zhang, L., Auteur Année de publication : 2013 Article en page(s) : pp. 703–706 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Electroless plating; low carbon steel; NiP/TiO2 bilayer coating; photocathodic protection; sol–gel Résumé : A combined electroless plating and sol–gel method was developed for preparing a NiP/TiO2 bilayer coating to achieve an especial photocathodic protection effect for A3 low carbon steel. Photocathodic protection properties of the coating were investigated by the electrochemical method. Surface morphology and structure of the coating were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the open circuit potential (OCP) of the NiP/TiO2 coating electrode shifts to −0.42 V under UV irradiation, which is lower than the corrosion potential of A3 low carbon steel. When the light is turned off, the photocathodic protection effect cannot be maintained. In addition, the mechanism of photocathodic protection for the coating was also explored. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106060/abstract [article] Photocathodic protection properties of NiP/TiO2 bilayer coatings by a combined electroless plating and sol–gel method [texte imprimé] / M.-J. Zhou, Auteur ; N. Zhang, Auteur ; Zhang, L., Auteur . - 2013 . - pp. 703–706.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 703–706
Mots-clés : Electroless plating; low carbon steel; NiP/TiO2 bilayer coating; photocathodic protection; sol–gel Résumé : A combined electroless plating and sol–gel method was developed for preparing a NiP/TiO2 bilayer coating to achieve an especial photocathodic protection effect for A3 low carbon steel. Photocathodic protection properties of the coating were investigated by the electrochemical method. Surface morphology and structure of the coating were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the open circuit potential (OCP) of the NiP/TiO2 coating electrode shifts to −0.42 V under UV irradiation, which is lower than the corrosion potential of A3 low carbon steel. When the light is turned off, the photocathodic protection effect cannot be maintained. In addition, the mechanism of photocathodic protection for the coating was also explored. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106060/abstract
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 707–712
Titre : A new theory for the negative difference effect in magnesium corrosion Type de document : texte imprimé Auteurs : S. Bender, Auteur ; J. Goellner, Auteur ; A. Heyn, Auteur Année de publication : 2013 Article en page(s) : pp. 707–712 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Current density-potential-curve; magnesium alloys; magnesium corrosion; negative difference effect; polarization measurements Résumé : An unusual feature known as the negative difference effect (NDE) can be observed in magnesium when recording corrosion current density–potential curves. More hydrogen is evolved at a more positive potential which does not occur in conventional metals. Several models have been proposed in the literature in order to explain the phenomenon of NDE. They succeed in explaining some effects, and fail to deal with others. A new model, which explains the NDE by two electron consuming processes, is presented in this paper. By potentiostatic investigations of magnesium in a chloride electrolyte, measurements of hydrogen evolution and chemical analysis of the electrolyte the new model was experimentally verified. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106225/abstract [article] A new theory for the negative difference effect in magnesium corrosion [texte imprimé] / S. Bender, Auteur ; J. Goellner, Auteur ; A. Heyn, Auteur . - 2013 . - pp. 707–712.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 707–712
Mots-clés : Current density-potential-curve; magnesium alloys; magnesium corrosion; negative difference effect; polarization measurements Résumé : An unusual feature known as the negative difference effect (NDE) can be observed in magnesium when recording corrosion current density–potential curves. More hydrogen is evolved at a more positive potential which does not occur in conventional metals. Several models have been proposed in the literature in order to explain the phenomenon of NDE. They succeed in explaining some effects, and fail to deal with others. A new model, which explains the NDE by two electron consuming processes, is presented in this paper. By potentiostatic investigations of magnesium in a chloride electrolyte, measurements of hydrogen evolution and chemical analysis of the electrolyte the new model was experimentally verified. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106225/abstract
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 713–719
Titre : Corrosion and self-healing behaviour of AZ91D magnesium alloy in ethylene glycol/water solutions Type de document : texte imprimé Auteurs : L. Wang, Auteur ; T. Zhou, Auteur ; J. Liang, Auteur Année de publication : 2013 Article en page(s) : pp. 713–719 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : AZ91D magnesium alloys; corrosion behaviour; ethylene glycol; self-healing behaviour Résumé : Corrosion behaviour of magnesium alloy-based engine parts in cooling system is an urgent fundamental issue in automotive field where magnesium alloys are increasingly used. In the present work, the corrosion behaviour of AZ91D magnesium alloys in various ethylene glycol/water solutions was studied by electrochemical measurements and immersion tests at room temperature. The surfaces of the samples after immersion tests were examined using scanning electron microscope (SEM) and X-ray diffraction (XRD). The results showed that the corrosion rates of AZ91D magnesium alloys decreased with the increase of ethylene glycol concentration in ethylene glycol/water solutions and the corrosion process was dominated by pitting corrosion. A continuous protective film transferred from corrosion products was formed on the corroded surface after sufficient immersion duration in ethylene glycol/water solutions, which is able to heal the corrosion pits. The self-healing behaviour inhibited the further corrosion of AZ91D magnesium alloy. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106131/abstract [article] Corrosion and self-healing behaviour of AZ91D magnesium alloy in ethylene glycol/water solutions [texte imprimé] / L. Wang, Auteur ; T. Zhou, Auteur ; J. Liang, Auteur . - 2013 . - pp. 713–719.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 713–719
Mots-clés : AZ91D magnesium alloys; corrosion behaviour; ethylene glycol; self-healing behaviour Résumé : Corrosion behaviour of magnesium alloy-based engine parts in cooling system is an urgent fundamental issue in automotive field where magnesium alloys are increasingly used. In the present work, the corrosion behaviour of AZ91D magnesium alloys in various ethylene glycol/water solutions was studied by electrochemical measurements and immersion tests at room temperature. The surfaces of the samples after immersion tests were examined using scanning electron microscope (SEM) and X-ray diffraction (XRD). The results showed that the corrosion rates of AZ91D magnesium alloys decreased with the increase of ethylene glycol concentration in ethylene glycol/water solutions and the corrosion process was dominated by pitting corrosion. A continuous protective film transferred from corrosion products was formed on the corroded surface after sufficient immersion duration in ethylene glycol/water solutions, which is able to heal the corrosion pits. The self-healing behaviour inhibited the further corrosion of AZ91D magnesium alloy. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106131/abstract
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 720–728
Titre : The corrosion behavior of carbon steel in CO2-saturated NaCl crevice solution containing acetic acid Type de document : texte imprimé Auteurs : Q. Hu, Auteur ; X. Guo, Auteur ; G. Zhang, Auteur Année de publication : 2013 Article en page(s) : pp. 720–728 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Carbon steel; crevice corrosion; electrochemical noise; electrochemical impedance spectroscopy Résumé : The corrosion behavior of X52 carbon steel electrodes in CO2-saturated NaCl crevice solution containing HAc was investigated by electrochemical measurements. Chemical environment measurements by Cl− and pH microprobes show an enrichment of Cl− ions and an increase of pH values inside the crevice. Moreover, both increments could accelerate with the decreasing dimension of the crevice mouth due to the high diffusive resistance. When the electrode in the crevice solution is coupled with the electrode in bulk solution, the alkalization and the enrichment of Cl− ions in the crevice solution can result in a negative shift of potential of the electrode in crevice solution, while the potential of the electrode in bulk solution shifts positively during the corrosion process. Thus, a galvanic corrosion is established with the electrode in the crevice solution acting as anode while another in the bulk solution as cathode, i.e., the corrosion in the crevice solution was enhanced while the corrosion in the bulk solution was retarded. The anodic dissolution and the cathodic reduction processes dominate in the crevice solution and in the bulk solution, respectively. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006027/abstract [article] The corrosion behavior of carbon steel in CO2-saturated NaCl crevice solution containing acetic acid [texte imprimé] / Q. Hu, Auteur ; X. Guo, Auteur ; G. Zhang, Auteur . - 2013 . - pp. 720–728.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 720–728
Mots-clés : Carbon steel; crevice corrosion; electrochemical noise; electrochemical impedance spectroscopy Résumé : The corrosion behavior of X52 carbon steel electrodes in CO2-saturated NaCl crevice solution containing HAc was investigated by electrochemical measurements. Chemical environment measurements by Cl− and pH microprobes show an enrichment of Cl− ions and an increase of pH values inside the crevice. Moreover, both increments could accelerate with the decreasing dimension of the crevice mouth due to the high diffusive resistance. When the electrode in the crevice solution is coupled with the electrode in bulk solution, the alkalization and the enrichment of Cl− ions in the crevice solution can result in a negative shift of potential of the electrode in crevice solution, while the potential of the electrode in bulk solution shifts positively during the corrosion process. Thus, a galvanic corrosion is established with the electrode in the crevice solution acting as anode while another in the bulk solution as cathode, i.e., the corrosion in the crevice solution was enhanced while the corrosion in the bulk solution was retarded. The anodic dissolution and the cathodic reduction processes dominate in the crevice solution and in the bulk solution, respectively. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006027/abstract
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 729–734
Titre : Experimental and theoretical study of the inhibition effects of some Schiff bases as corrosion inhibitors of aluminium in HCl Type de document : texte imprimé Auteurs : A. Aytaç, Auteur ; S. Bilgiç, Auteur ; G. Gece, Auteur Année de publication : 2013 Article en page(s) : pp. 729–734 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Aluminium; corrosion inhibition; DFT; impedance; Schiff base Résumé : The inhibition efficiencies of two new synthesized Schiff bases have been investigated for aluminium in 0.5 M HCl solution using experimental and theoretical methods. Potentiodynamic polarization and EIS method were used to determine the inhibition efficiencies. From the experimental results it has been found that both compounds adsorb on the aluminium surface according to the Temkin adsorption isotherm. Quantum chemical calculations were further applied to reveal the adsorption structure and explain the experimental results. A good correlation between the quantum chemical parameters and the experimental inhibition efficiency has been found. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106241/abstract [article] Experimental and theoretical study of the inhibition effects of some Schiff bases as corrosion inhibitors of aluminium in HCl [texte imprimé] / A. Aytaç, Auteur ; S. Bilgiç, Auteur ; G. Gece, Auteur . - 2013 . - pp. 729–734.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 729–734
Mots-clés : Aluminium; corrosion inhibition; DFT; impedance; Schiff base Résumé : The inhibition efficiencies of two new synthesized Schiff bases have been investigated for aluminium in 0.5 M HCl solution using experimental and theoretical methods. Potentiodynamic polarization and EIS method were used to determine the inhibition efficiencies. From the experimental results it has been found that both compounds adsorb on the aluminium surface according to the Temkin adsorption isotherm. Quantum chemical calculations were further applied to reveal the adsorption structure and explain the experimental results. A good correlation between the quantum chemical parameters and the experimental inhibition efficiency has been found. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106241/abstract
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 735–738
Titre : First-principles study on influence of alloying elements on electrochemical stability of cobalt-base alloys Type de document : texte imprimé Auteurs : B. L. Lü, Auteur ; W. L. Zhou, Auteur ; G. Q. Chen, Auteur Année de publication : 2013 Article en page(s) : pp. 735–738 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Adsorption; cobalt-base alloys; corrosion; first principles Résumé : The paper studies the impact of the metal elements Nb, Ta, Zr, Mo, W, Al, Si, and Y on electrochemical stability of non-passivated cobalt-base alloys by evaluating the chemical potential and the electrode potential shift relative to pure cobalt metal using first-principles calculations. Nb, Ta, and Si are found to make the surface Co atoms more stable on the {0001} surfaces of the corresponding alloys compared to pure Co {0001} surfaces, whereas Al, W, Mo, Y, and Zr make Co atoms less stable. Among all the considered alloying elements, niobium is the most beneficial to the stability enhancement of alloys. Furthermore, the effects of water adsorption on the electrochemical stability are considered. It is found that the surface adsorption properties may be considerably modified by introducing the Nb atoms. Our results indicate that water adsorption destabilizes both the alloy and pure metal surface. However, the Co-Nb alloy surface is still more stable than the pure Co surface in the presence of absorbed water. Our calculation reveals that the electrochemical stability of the Co-Nb alloy is sensitive to water molecular adsorption in comparison with that of the pure Co metal. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106074/abstract [article] First-principles study on influence of alloying elements on electrochemical stability of cobalt-base alloys [texte imprimé] / B. L. Lü, Auteur ; W. L. Zhou, Auteur ; G. Q. Chen, Auteur . - 2013 . - pp. 735–738.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 735–738
Mots-clés : Adsorption; cobalt-base alloys; corrosion; first principles Résumé : The paper studies the impact of the metal elements Nb, Ta, Zr, Mo, W, Al, Si, and Y on electrochemical stability of non-passivated cobalt-base alloys by evaluating the chemical potential and the electrode potential shift relative to pure cobalt metal using first-principles calculations. Nb, Ta, and Si are found to make the surface Co atoms more stable on the {0001} surfaces of the corresponding alloys compared to pure Co {0001} surfaces, whereas Al, W, Mo, Y, and Zr make Co atoms less stable. Among all the considered alloying elements, niobium is the most beneficial to the stability enhancement of alloys. Furthermore, the effects of water adsorption on the electrochemical stability are considered. It is found that the surface adsorption properties may be considerably modified by introducing the Nb atoms. Our results indicate that water adsorption destabilizes both the alloy and pure metal surface. However, the Co-Nb alloy surface is still more stable than the pure Co surface in the presence of absorbed water. Our calculation reveals that the electrochemical stability of the Co-Nb alloy is sensitive to water molecular adsorption in comparison with that of the pure Co metal. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106074/abstract
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 739–743
Titre : Influences of cube texture on etched foil capacitance Type de document : texte imprimé Auteurs : F. Kuang, Auteur ; F.X. Li, Auteur ; Hong, T., Auteur Année de publication : 2013 Article en page(s) : pp. 739–743 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Cube texture; current efficiency; etched foil; weight loss Résumé : The influences of aluminum cube texture on etched foil qualities and current efficiency were studied in this paper. The present results indicated that the decrease of cube texture (volume fraction) would lead to the decrease of tunnel densities on etched foils. Current efficiency changed little with cube texture and could reach up to 98%. The same current efficiency led to the same electrochemical corrosion weight loss, which caused the etched foils with a smaller tunnel density had a larger tunnel size. The same electrochemical corrosion weight loss would also lead to the etched foils produced by different cube texture foil have the same folding endurance. The etched foil produced by the foil with a better cube texture would have a larger tunnel density, which caused the capacitance of it was larger. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106110/abstract [article] Influences of cube texture on etched foil capacitance [texte imprimé] / F. Kuang, Auteur ; F.X. Li, Auteur ; Hong, T., Auteur . - 2013 . - pp. 739–743.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 739–743
Mots-clés : Cube texture; current efficiency; etched foil; weight loss Résumé : The influences of aluminum cube texture on etched foil qualities and current efficiency were studied in this paper. The present results indicated that the decrease of cube texture (volume fraction) would lead to the decrease of tunnel densities on etched foils. Current efficiency changed little with cube texture and could reach up to 98%. The same current efficiency led to the same electrochemical corrosion weight loss, which caused the etched foils with a smaller tunnel density had a larger tunnel size. The same electrochemical corrosion weight loss would also lead to the etched foils produced by different cube texture foil have the same folding endurance. The etched foil produced by the foil with a better cube texture would have a larger tunnel density, which caused the capacitance of it was larger. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106110/abstract
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