Dépouillements

Non-destructive detection of corrosion applied to steel and galvanized steel coated with organic paints by the pulsed phase thermography / A. Schönberger in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 195–199 Titre : Non-destructive detection of corrosion applied to steel and galvanized steel coated with organic paints by the pulsed phase thermography Type de document : texte imprimé Auteurs : A. Schönberger, Auteur ; S. Virtanen, Auteur ; V. Giese, Auteur Année de publication : 2012 Article en page(s) : pp. 195–199 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Pulsed  Phase  Thermography;  PPT;  stone-chipping;  corrosion  propagation;  non-destructive;  FIB;  SEM;  IFM;  organic  coatings Résumé : Organic coatings in the automobile industry have to resist corrosion and mechanical damage from stone chipping. Currently, no tool is established in industrial non-destructive applications for analyzing the damage of stone-impacts and the following corrosion after accelerated corrosion tests. Measurement methods such as the scanning Kelvin probe can analyze the corrosion progress in a detailed manner, but with a long measurement time. The pulsed phase thermography (PPT) is a non-destructive tool to analyze inhomogeneities and defects in materials, with a huge field of applications existing. The present work shows advances in using the PPT to detect propagation of corrosion under coatings. Physical principles of the mechanism of the corrosion detection under coatings are described. Results of measurements of organic coatings on carbon steel as well as of organic coated galvanized steel show the corrosion propagation. Influencing factors to the measurement such as the thickness of the coatings are investigated, but no significant effect on the quality of the analysis was found. The corrosion progress can be monitored by the PPT fast and reliably. The achieved results correlate with the theoretical basis and the test results after surface characterization and destructive analysis of samples. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005918/abstract [article] Non-destructive detection of corrosion applied to steel and galvanized steel coated with organic paints by the pulsed phase thermography [texte imprimé] / A. Schönberger, Auteur ; S. Virtanen, Auteur ; V. Giese, Auteur . - 2012 . - pp. 195–199. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 195–199 Mots-clés : Pulsed  Phase  Thermography;  PPT;  stone-chipping;  corrosion  propagation;  non-destructive;  FIB;  SEM;  IFM;  organic  coatings Résumé : Organic coatings in the automobile industry have to resist corrosion and mechanical damage from stone chipping. Currently, no tool is established in industrial non-destructive applications for analyzing the damage of stone-impacts and the following corrosion after accelerated corrosion tests. Measurement methods such as the scanning Kelvin probe can analyze the corrosion progress in a detailed manner, but with a long measurement time. The pulsed phase thermography (PPT) is a non-destructive tool to analyze inhomogeneities and defects in materials, with a huge field of applications existing. The present work shows advances in using the PPT to detect propagation of corrosion under coatings. Physical principles of the mechanism of the corrosion detection under coatings are described. Results of measurements of organic coatings on carbon steel as well as of organic coated galvanized steel show the corrosion propagation. Influencing factors to the measurement such as the thickness of the coatings are investigated, but no significant effect on the quality of the analysis was found. The corrosion progress can be monitored by the PPT fast and reliably. The achieved results correlate with the theoretical basis and the test results after surface characterization and destructive analysis of samples. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005918/abstract

Measuring the corrosion rate of steel in concrete / P. V. Nygaard in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 200–214 Titre : Measuring the corrosion rate of steel in concrete : effect of measurement technique, polarisation time and current Type de document : texte imprimé Auteurs : P. V. Nygaard, Auteur ; M. R. Geiker, Auteur Année de publication : 2012 Article en page(s) : pp. 200–214 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion  current  density;  corrosion  rate;  galvanostatic;  polarisation  resistance;  potentiodynamic,  reinforced  concrete;  reinforcement  corrosion Résumé : Both on-site investigations and laboratory studies have shown that different corrosion rates are obtained when different commercially available corrosion rate instruments are used. The different electrochemical techniques and the measurement parameters used, i.e. polarisation current and time, are in some studies considered the main reasons for the variations. This paper presents an experimental study on the quantitative effect of polarisation time and current on the measured polarisation resistance – and thus the corrosion current density – of passively and actively corroding steel. Two electrochemical techniques often used in instruments for on-site corrosion rate measurements are investigated. On passively corroding reinforcement the measured polarisation resistance was for both techniques found to be highly affected by the polarisation time and current and no plateaus at either short or long polarisation times, or low or high polarisation currents were identified. On actively corroding reinforcement a large effect of the polarisation time was also found, but only a minor effect of the polarisation current. The effect of the polarisation time was, however, practically independent of the corrosion rate for actively corroding steel. For both techniques guidelines for polarisation times and currents are given for (on-site) non-destructive corrosion rate measurements on reinforcement steel in concrete. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005792/abstract [article] Measuring the corrosion rate of steel in concrete : effect of measurement technique, polarisation time and current [texte imprimé] / P. V. Nygaard, Auteur ; M. R. Geiker, Auteur . - 2012 . - pp. 200–214. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 200–214 Mots-clés : Corrosion  current  density;  corrosion  rate;  galvanostatic;  polarisation  resistance;  potentiodynamic,  reinforced  concrete;  reinforcement  corrosion Résumé : Both on-site investigations and laboratory studies have shown that different corrosion rates are obtained when different commercially available corrosion rate instruments are used. The different electrochemical techniques and the measurement parameters used, i.e. polarisation current and time, are in some studies considered the main reasons for the variations. This paper presents an experimental study on the quantitative effect of polarisation time and current on the measured polarisation resistance – and thus the corrosion current density – of passively and actively corroding steel. Two electrochemical techniques often used in instruments for on-site corrosion rate measurements are investigated. On passively corroding reinforcement the measured polarisation resistance was for both techniques found to be highly affected by the polarisation time and current and no plateaus at either short or long polarisation times, or low or high polarisation currents were identified. On actively corroding reinforcement a large effect of the polarisation time was also found, but only a minor effect of the polarisation current. The effect of the polarisation time was, however, practically independent of the corrosion rate for actively corroding steel. For both techniques guidelines for polarisation times and currents are given for (on-site) non-destructive corrosion rate measurements on reinforcement steel in concrete. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005792/abstract

Influence of substrate composition on the formation of phytic acid conversion coatings / X. Cui in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 215–222 Titre : Influence of substrate composition on the formation of phytic acid conversion coatings Type de document : texte imprimé Auteurs : X. Cui, Auteur ; Jin, G., Auteur ; E. Liu, Auteur Année de publication : 2012 Article en page(s) : pp. 215–222 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion;  formation;  influence;  phytic  acid  conversion  coating;  substrate  composition Résumé : In this paper, the formation and corrosion resistance of the phytic acid conversion coatings on Mg, Al, and AZ91D magnesium alloy were contrastively investigated using scanning electronic microscopy (SEM), Auger electron spectroscopy (AES), Fourier transform infrared spectroscopy (FTIR), electronic probe microscopic analyzer (EPMA), electronic balance, and electrochemical methods. The influence of phytic acid conversion coating as a middle layer on the properties of the paint on magnesium alloys was also investigated. The results show that the formation process of the conversion coatings is evidently influenced by the compositions of the substrate. The coating on pure aluminum is thinner and compacter than that on pure magnesium and the coating formed on α phase in AZ91D magnesium alloy is thinner but denser than that on β phase. The phytic acid conversion coatings formed on Mg, Al, and AZ91D magnesium alloy can all increase their corrosion resistance. The active functional groups of hydroxyl and phosphate radical are rich in the conversion coatings, which can improve the bonding between the organic paint and magnesium alloy and then improve their corrosion resistance. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005686/abstract [article] Influence of substrate composition on the formation of phytic acid conversion coatings [texte imprimé] / X. Cui, Auteur ; Jin, G., Auteur ; E. Liu, Auteur . - 2012 . - pp. 215–222. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 215–222 Mots-clés : Corrosion;  formation;  influence;  phytic  acid  conversion  coating;  substrate  composition Résumé : In this paper, the formation and corrosion resistance of the phytic acid conversion coatings on Mg, Al, and AZ91D magnesium alloy were contrastively investigated using scanning electronic microscopy (SEM), Auger electron spectroscopy (AES), Fourier transform infrared spectroscopy (FTIR), electronic probe microscopic analyzer (EPMA), electronic balance, and electrochemical methods. The influence of phytic acid conversion coating as a middle layer on the properties of the paint on magnesium alloys was also investigated. The results show that the formation process of the conversion coatings is evidently influenced by the compositions of the substrate. The coating on pure aluminum is thinner and compacter than that on pure magnesium and the coating formed on α phase in AZ91D magnesium alloy is thinner but denser than that on β phase. The phytic acid conversion coatings formed on Mg, Al, and AZ91D magnesium alloy can all increase their corrosion resistance. The active functional groups of hydroxyl and phosphate radical are rich in the conversion coatings, which can improve the bonding between the organic paint and magnesium alloy and then improve their corrosion resistance. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005686/abstract

Corrosion in alkanolamine used for acid gas removal: From natural gas processing to CO2 capture / J. Kittel in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 223–230 Titre : Corrosion in alkanolamine used for acid gas removal: From natural gas processing to CO2 capture Type de document : texte imprimé Auteurs : J. Kittel, Auteur ; E. Fleury, Auteur ; B. Vuillemin, Auteur Année de publication : 2012 Article en page(s) : pp. 223–230 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : CO2  capture;  gas  treatment;  monoethanolamine Résumé : The aim of this paper is to review some of the parameters influencing the corrosivity of alkanolamine solvents used for natural gas purification or for CO2 capture. In the light of literature data and of new experimental results, the influences of temperature and of acid gas loading are discussed. These two parameters appear to have a strong impact on corrosion rates of carbon steel, with extrapolated corrosion rates of several tens of mm/year for the highest temperature and acid gas loading condition. It is then proposed to discuss about similarities and differences between natural gas processing and CO2 capture from flue gas. For both applications, alkanolamine processes are used. Still, differences can be found in operating parameters. The most significant gap concerns the lean amine sections. In acid gas treatment, the regeneration of the solvent is often performed down to zero loading. Under these conditions, an extremely low corrosivity of the lean solvent is expected. On the contrary, CO2 capture from flue gas requires only a partial stripping of the CO2 in the regeneration section, due to energy efficiency reasons. Then, the lean solvent still contains some acid gas, and subsequently a higher corrosivity. Finally, the general principles for material selection for the different parts of acid gas removal units are discussed, considering both cases of natural gas processing or CO2 capture. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005847/abstract [article] Corrosion in alkanolamine used for acid gas removal: From natural gas processing to CO2 capture [texte imprimé] / J. Kittel, Auteur ; E. Fleury, Auteur ; B. Vuillemin, Auteur . - 2012 . - pp. 223–230. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 223–230 Mots-clés : CO2  capture;  gas  treatment;  monoethanolamine Résumé : The aim of this paper is to review some of the parameters influencing the corrosivity of alkanolamine solvents used for natural gas purification or for CO2 capture. In the light of literature data and of new experimental results, the influences of temperature and of acid gas loading are discussed. These two parameters appear to have a strong impact on corrosion rates of carbon steel, with extrapolated corrosion rates of several tens of mm/year for the highest temperature and acid gas loading condition. It is then proposed to discuss about similarities and differences between natural gas processing and CO2 capture from flue gas. For both applications, alkanolamine processes are used. Still, differences can be found in operating parameters. The most significant gap concerns the lean amine sections. In acid gas treatment, the regeneration of the solvent is often performed down to zero loading. Under these conditions, an extremely low corrosivity of the lean solvent is expected. On the contrary, CO2 capture from flue gas requires only a partial stripping of the CO2 in the regeneration section, due to energy efficiency reasons. Then, the lean solvent still contains some acid gas, and subsequently a higher corrosivity. Finally, the general principles for material selection for the different parts of acid gas removal units are discussed, considering both cases of natural gas processing or CO2 capture. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005847/abstract

Corrosion inhibition of austenitic stainless steel by some pyrimidine compounds in hydrochloric acid / N. Caliskan in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 231–237 Titre : Corrosion inhibition of austenitic stainless steel by some pyrimidine compounds in hydrochloric acid Type de document : texte imprimé Auteurs : N. Caliskan, Auteur ; E. Akbas, Auteur Année de publication : 2012 Article en page(s) : pp. 231–237 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Acid  corrosion;  pyrimidine  derivatives;  stainless  steel;  inhibition Résumé : The inhibition effect of two pyrimidine derivatives on the corrosion of austenitic stainless steel in 1 M HCl has been studied by Tafel plot, linear polarization, and electrochemical impedance spectroscopy (EIS) at 298 K. Results showed that compounds inhibited steel corrosion in a 1 M HCl solution and inhibition efficiencies increased with the concentration of inhibitor. Polarization curves indicated that all studied pyrimidine derivatives act as mixed type (cathodic/anodic) inhibitors. The adsorption of the inhibitors on the stainless steel surface was found to obey the Langmuir and Dubinin–Radushkevich adsorption isotherm models. Negative values of ΔGads in the acidic media ensured the spontaneity of the adsorption process. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005788/abstract [article] Corrosion inhibition of austenitic stainless steel by some pyrimidine compounds in hydrochloric acid [texte imprimé] / N. Caliskan, Auteur ; E. Akbas, Auteur . - 2012 . - pp. 231–237. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 231–237 Mots-clés : Acid  corrosion;  pyrimidine  derivatives;  stainless  steel;  inhibition Résumé : The inhibition effect of two pyrimidine derivatives on the corrosion of austenitic stainless steel in 1 M HCl has been studied by Tafel plot, linear polarization, and electrochemical impedance spectroscopy (EIS) at 298 K. Results showed that compounds inhibited steel corrosion in a 1 M HCl solution and inhibition efficiencies increased with the concentration of inhibitor. Polarization curves indicated that all studied pyrimidine derivatives act as mixed type (cathodic/anodic) inhibitors. The adsorption of the inhibitors on the stainless steel surface was found to obey the Langmuir and Dubinin–Radushkevich adsorption isotherm models. Negative values of ΔGads in the acidic media ensured the spontaneity of the adsorption process. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005788/abstract

Intergranular attack and intergranular stress corrosion cracking of Alloy 690 TT in high temperature lead-containing caustic solution / Y. Hu in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 238–246 Titre : Intergranular attack and intergranular stress corrosion cracking of Alloy 690 TT in high temperature lead-containing caustic solution Type de document : texte imprimé Auteurs : Y. Hu, Auteur ; J. Wang, Auteur ; W. Ke, Auteur Année de publication : 2012 Article en page(s) : pp. 238–246 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Alloy  690  TT;  intergranular  attack;  intergranular  stress  corrosion  cracking;  oxide  film Résumé : Immersion tests were carried out in high temperature lead-containing caustic solution in a static autoclave. The results showed samples with three surface statuses of Alloy 690 TT suffered from intergranular attack (IGA) after immersion in 10% sodium hydroxide (wt%) with 10 g/L of litharge at 330 °C for different times. With the increasing immersion time, IGA became more severe. Wire cutting samples had the most serious IGA, ground samples followed and electro-polished samples had the slightest IGA. IGA had developed into IGSCC only in wire cutting samples due to the existence of residual stress. All the specimens at different immersion time tests lost weight. To the same cold-work samples, with the increasing immersion time, the weight loss increased. No IGA was found in 10% sodium hydroxide solution at 330 °C after 720 h immersion. When adding 100 ppm litharge into 10% sodium hydroxide solution, slight IGA was produced. IGA became more serious and the weight loss of the specimens with three surface statuses increased with the increase of lead concentration. As the results of 1% sodium hydroxide solution containing 10 g/L litharge and 4% sodium hydroxide solution containing 10 g/L litharge at 330 °C for 720 h immersion tests, only slight IGA occurred and the weight of samples with three surface statuses increased. The pH value played an important role in lead-induced corrosion in caustic solution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005725/abstract [article] Intergranular attack and intergranular stress corrosion cracking of Alloy 690 TT in high temperature lead-containing caustic solution [texte imprimé] / Y. Hu, Auteur ; J. Wang, Auteur ; W. Ke, Auteur . - 2012 . - pp. 238–246. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 238–246 Mots-clés : Alloy  690  TT;  intergranular  attack;  intergranular  stress  corrosion  cracking;  oxide  film Résumé : Immersion tests were carried out in high temperature lead-containing caustic solution in a static autoclave. The results showed samples with three surface statuses of Alloy 690 TT suffered from intergranular attack (IGA) after immersion in 10% sodium hydroxide (wt%) with 10 g/L of litharge at 330 °C for different times. With the increasing immersion time, IGA became more severe. Wire cutting samples had the most serious IGA, ground samples followed and electro-polished samples had the slightest IGA. IGA had developed into IGSCC only in wire cutting samples due to the existence of residual stress. All the specimens at different immersion time tests lost weight. To the same cold-work samples, with the increasing immersion time, the weight loss increased. No IGA was found in 10% sodium hydroxide solution at 330 °C after 720 h immersion. When adding 100 ppm litharge into 10% sodium hydroxide solution, slight IGA was produced. IGA became more serious and the weight loss of the specimens with three surface statuses increased with the increase of lead concentration. As the results of 1% sodium hydroxide solution containing 10 g/L litharge and 4% sodium hydroxide solution containing 10 g/L litharge at 330 °C for 720 h immersion tests, only slight IGA occurred and the weight of samples with three surface statuses increased. The pH value played an important role in lead-induced corrosion in caustic solution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005725/abstract

Electrochemical corrosion response of a precipitation hardening moulds steel in a NaCl solution / F. Rosalbino in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 247–253 Titre : Electrochemical corrosion response of a precipitation hardening moulds steel in a NaCl solution Type de document : texte imprimé Auteurs : F. Rosalbino, Auteur ; G. Scavino, Auteur ; G. Mortarino, Auteur Année de publication : 2012 Article en page(s) : pp. 247–253 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion  behavior;  electrochemical  impedance  spectroscopy;  polarization  curves;  precipitation  hardening  moulds  steel Résumé : Investigations concerning the electrochemical corrosion behavior of mould steels are scarce and limited. In the present study, the corrosion resistance of a precipitation hardening moulds steel submitted to aging treatments has been assessed in a 0.1 M NaCl aqueous solution by means of potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The electrochemical characterization of the steel not submitted to hardening treatments was also examined and a comparative study was made between the different specimens. Scanning electron microscopy and electron probe microanalysis were used to obtain information about the morphology and chemical composition of the steels surface after the electrochemical tests. Increasing the aging temperature an increase of secondary hardness is observed, attributable to an increase of secondary phases (re-precipitated carbides and metastable GP zones) amount, positively reflecting on the mechanical properties. However, the electrochemical results show a progressive worsening of the corrosion behavior, the as-received steel sample exhibiting the best corrosion resistance. The observed decrease of corrosion resistance with increasing the aging temperature is ascribed to enhanced galvanic coupling phenomena between the secondary phases, acting as cathodes, and the surrounding matrix which, consequently, experiences preferential dissolution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005820/abstract [article] Electrochemical corrosion response of a precipitation hardening moulds steel in a NaCl solution [texte imprimé] / F. Rosalbino, Auteur ; G. Scavino, Auteur ; G. Mortarino, Auteur . - 2012 . - pp. 247–253. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 247–253 Mots-clés : Corrosion  behavior;  electrochemical  impedance  spectroscopy;  polarization  curves;  precipitation  hardening  moulds  steel Résumé : Investigations concerning the electrochemical corrosion behavior of mould steels are scarce and limited. In the present study, the corrosion resistance of a precipitation hardening moulds steel submitted to aging treatments has been assessed in a 0.1 M NaCl aqueous solution by means of potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The electrochemical characterization of the steel not submitted to hardening treatments was also examined and a comparative study was made between the different specimens. Scanning electron microscopy and electron probe microanalysis were used to obtain information about the morphology and chemical composition of the steels surface after the electrochemical tests. Increasing the aging temperature an increase of secondary hardness is observed, attributable to an increase of secondary phases (re-precipitated carbides and metastable GP zones) amount, positively reflecting on the mechanical properties. However, the electrochemical results show a progressive worsening of the corrosion behavior, the as-received steel sample exhibiting the best corrosion resistance. The observed decrease of corrosion resistance with increasing the aging temperature is ascribed to enhanced galvanic coupling phenomena between the secondary phases, acting as cathodes, and the surrounding matrix which, consequently, experiences preferential dissolution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005820/abstract

Effect of the deformation on the stress–corrosion cracking of Al–Zn–Mg–Cu alloys / G. S. Peng in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 254–258 Titre : Effect of the deformation on the stress–corrosion cracking of Al–Zn–Mg–Cu alloys Type de document : texte imprimé Auteurs : G. S. Peng, Auteur ; K. H. Chen, Auteur ; S. Y. Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 254–258 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Aluminum  alloy;  DCB;  SSRT;  stress  corrosion Résumé : The effect of deformation on the stress–corrosion cracking (SCC) of Al–Zn–Mg–Cu alloys is studied by slow strain rate technique (SSRT) and bolt-loaded double cantilever beam (DCB) tests. Results show that with the deformation increasing, the undissolved particles and subgrain size decrease whereas the fraction of recrystallization increases after solution treatment. The susceptibility to SCC by SSRT and DCB tests varies on different deformation amount alloy, in which cause is discussed. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005732/abstract [article] Effect of the deformation on the stress–corrosion cracking of Al–Zn–Mg–Cu alloys [texte imprimé] / G. S. Peng, Auteur ; K. H. Chen, Auteur ; S. Y. Chen, Auteur . - 2012 . - pp. 254–258. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 254–258 Mots-clés : Aluminum  alloy;  DCB;  SSRT;  stress  corrosion Résumé : The effect of deformation on the stress–corrosion cracking (SCC) of Al–Zn–Mg–Cu alloys is studied by slow strain rate technique (SSRT) and bolt-loaded double cantilever beam (DCB) tests. Results show that with the deformation increasing, the undissolved particles and subgrain size decrease whereas the fraction of recrystallization increases after solution treatment. The susceptibility to SCC by SSRT and DCB tests varies on different deformation amount alloy, in which cause is discussed. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005732/abstract

Effect of Sn addition on the corrosion behavior of Ti-Ta alloy / B. Guo in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 259–263 Titre : Effect of Sn addition on the corrosion behavior of Ti-Ta alloy Type de document : texte imprimé Auteurs : B. Guo, Auteur ; Y. X. Tong, Auteur ; F. Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 259–263 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion  resistance;  electrochemical  measurements;  solution  treatment;  Ti-Ta-Sn  alloys Résumé : In the present paper, the effect of Sn addition on phase constitution and corrosion behavior of Ti65Ta(35−x)Snx (x  = 0, 1, 3, 5 at%) alloys has been investigated using X-ray diffraction and electrochemical measurements. The results show that the β phase is stabilized when quenching after the addition of Sn into Ti65Ta35 alloy, with Ti65Ta30Sn5 alloy consisting of single β phase at room temperature. The corrosion resistance is enhanced with increase in the Sn content. When the Sn content increases up to 5%, the addition of Sn results in a decrease of corrosion current density from 0.690 µA/cm2 of the Ti65Ta35 alloy to 0.098 µA/cm2, and corresponding passive current density decreased from 37.7 µA/cm2 of the Ti65Ta35 alloy to 9.30 µA/cm2. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005824/abstract [article] Effect of Sn addition on the corrosion behavior of Ti-Ta alloy [texte imprimé] / B. Guo, Auteur ; Y. X. Tong, Auteur ; F. Chen, Auteur . - 2012 . - pp. 259–263. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 259–263 Mots-clés : Corrosion  resistance;  electrochemical  measurements;  solution  treatment;  Ti-Ta-Sn  alloys Résumé : In the present paper, the effect of Sn addition on phase constitution and corrosion behavior of Ti65Ta(35−x)Snx (x  = 0, 1, 3, 5 at%) alloys has been investigated using X-ray diffraction and electrochemical measurements. The results show that the β phase is stabilized when quenching after the addition of Sn into Ti65Ta35 alloy, with Ti65Ta30Sn5 alloy consisting of single β phase at room temperature. The corrosion resistance is enhanced with increase in the Sn content. When the Sn content increases up to 5%, the addition of Sn results in a decrease of corrosion current density from 0.690 µA/cm2 of the Ti65Ta35 alloy to 0.098 µA/cm2, and corresponding passive current density decreased from 37.7 µA/cm2 of the Ti65Ta35 alloy to 9.30 µA/cm2. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005824/abstract

Damage of stainless steel bars due to atmospheric corrosion / A. Burkert in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 264–270 Titre : Damage of stainless steel bars due to atmospheric corrosion Type de document : texte imprimé Auteurs : A. Burkert, Auteur ; J. Lehmann, Auteur Année de publication : 2012 Article en page(s) : pp. 264–270 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Atmospheric  corrosion;  EPR  test;  failure;  intercrystalline  corrosion;  stainless  steel Résumé : In addition to constructional requirements in civil engineering stainless steels often have to fulfil high visual demands. Unexpected impairments of the visual appearance of stainless steels under low corrosive conditions are a widespread problem today. Frequently it is supposed that this is caused by changes in the alloy composition, worse environmental conditions or improper handling. Within a research project the systematic investigation of several cases of damaged stainless steel bars has shown that the reasons are based on well-known material defects like chemical inhomogeneities (e.g. precipitations or local carburization) or geometrical defects (e.g. undercuts, rolling defects or shell formation). Thus, the failures could be clearly identified as production failures of the respective semi-finished products. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005701/abstract [article] Damage of stainless steel bars due to atmospheric corrosion [texte imprimé] / A. Burkert, Auteur ; J. Lehmann, Auteur . - 2012 . - pp. 264–270. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 264–270 Mots-clés : Atmospheric  corrosion;  EPR  test;  failure;  intercrystalline  corrosion;  stainless  steel Résumé : In addition to constructional requirements in civil engineering stainless steels often have to fulfil high visual demands. Unexpected impairments of the visual appearance of stainless steels under low corrosive conditions are a widespread problem today. Frequently it is supposed that this is caused by changes in the alloy composition, worse environmental conditions or improper handling. Within a research project the systematic investigation of several cases of damaged stainless steel bars has shown that the reasons are based on well-known material defects like chemical inhomogeneities (e.g. precipitations or local carburization) or geometrical defects (e.g. undercuts, rolling defects or shell formation). Thus, the failures could be clearly identified as production failures of the respective semi-finished products. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005701/abstract

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