Dépouillements

Recent advances in understanding metal dusting / D. J. Young in Materials and corrosion, Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 7–28 Titre : Recent advances in understanding metal dusting : a review Type de document : texte imprimé Auteurs : D. J. Young, Auteur ; J. Zhang, Auteur ; C. Geers, Auteur Année de publication : 2011 Article en page(s) : pp. 7–28 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : alloy  composition  Cementite  Coating  Coking  Metal  dusting  Second  phase  effect  Surface  catalysis Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Recent experimental investigations have widened the understanding of metal dusting significantly. Microscopic observations have been used to dissect dusting mechanisms. Iron dusts by growing a cementite surface scale, which catalyses graphite nucleation and growth. The resulting volume expansion leads to cementite disintegration. Cementite formation on iron can be suppressed by alloying with germanium. Nonetheless, dusting occurs via the direct growth of graphite into the metal, producing nanoparticles of ferrite. This process is faster, because carbon diffusion is more rapid in α-Fe than in Fe3C. Austenitic materials cannot form cementite, and dust via formation of graphite at external surfaces and interior grain boundaries. The coke deposit consists of carbon nanotubes with austenite particles at their tips, or graphite particles encapsulating austenite. TEM studies demonstrate the inward growth of graphite within the metal interior. It is therefore concluded that the dusting mechanism of austenitic materials like high alloy Cr–Ni steels and Ni base materials is one of graphite nucleation and growth within the near surface metal. In all alloys examined, both ferritic and austenitic, the principal mass transfer process is inward diffusion of carbon. Alloying iron with nickel leads to a transformation from one mechanism with carbide formation to the other without. Copper alloying in nickel and high nickel content stainless steels strongly suppresses graphite nucleation, as does also an intermetallic Ni–Sn phase, thereby reducing greatly the overall dusting rate. A surface layer of intermetallic Ni–Sn Fe-base materials facilitates the formation of a Fe3SnC surface scale which also prevents coking and metal dusting. Current understanding of the roles of temperature, gas composition and surface oxides on dusting rates are summarised. Finally, protection against metal dusting by coatings is discussed in terms of their effects on catalysis of carbon deposition, and on protective oxide formation. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005675/abstract [article] Recent advances in understanding metal dusting : a review [texte imprimé] / D. J. Young, Auteur ; J. Zhang, Auteur ; C. Geers, Auteur . - 2011 . - pp. 7–28. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 7–28 Mots-clés : alloy  composition  Cementite  Coating  Coking  Metal  dusting  Second  phase  effect  Surface  catalysis Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Recent experimental investigations have widened the understanding of metal dusting significantly. Microscopic observations have been used to dissect dusting mechanisms. Iron dusts by growing a cementite surface scale, which catalyses graphite nucleation and growth. The resulting volume expansion leads to cementite disintegration. Cementite formation on iron can be suppressed by alloying with germanium. Nonetheless, dusting occurs via the direct growth of graphite into the metal, producing nanoparticles of ferrite. This process is faster, because carbon diffusion is more rapid in α-Fe than in Fe3C. Austenitic materials cannot form cementite, and dust via formation of graphite at external surfaces and interior grain boundaries. The coke deposit consists of carbon nanotubes with austenite particles at their tips, or graphite particles encapsulating austenite. TEM studies demonstrate the inward growth of graphite within the metal interior. It is therefore concluded that the dusting mechanism of austenitic materials like high alloy Cr–Ni steels and Ni base materials is one of graphite nucleation and growth within the near surface metal. In all alloys examined, both ferritic and austenitic, the principal mass transfer process is inward diffusion of carbon. Alloying iron with nickel leads to a transformation from one mechanism with carbide formation to the other without. Copper alloying in nickel and high nickel content stainless steels strongly suppresses graphite nucleation, as does also an intermetallic Ni–Sn phase, thereby reducing greatly the overall dusting rate. A surface layer of intermetallic Ni–Sn Fe-base materials facilitates the formation of a Fe3SnC surface scale which also prevents coking and metal dusting. Current understanding of the roles of temperature, gas composition and surface oxides on dusting rates are summarised. Finally, protection against metal dusting by coatings is discussed in terms of their effects on catalysis of carbon deposition, and on protective oxide formation. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005675/abstract

Synthesis and mechanical properties of nickel-titania composite coatings / S. A. Lajevardi in Materials and corrosion, Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 29–34 Titre : Synthesis and mechanical properties of nickel-titania composite coatings Type de document : texte imprimé Auteurs : S. A. Lajevardi, Auteur ; T. Shahrabi, Auteur ; V. Hasannaeimi, Auteur Année de publication : 2011 Article en page(s) : pp. 29–34 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Composite  coatings  Electrocodeposition  Nickel  Titania  particles  Ultrasonic  waves Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Nickel-titania composite coatings were prepared under direct current conditions by codeposition of nano titania particles (21 nm) and nickel from a nickel Watts type bath. Current density, concentration of titania particles, effect of agitation, and ultrasonic waves were investigated and the optimum values of these parameters for reaching to maximum vol% of titania particles in the coating were determined. Microhardness of these coatings was investigated by Vickers method and their morphological properties and chemical composition were studied by SEM and EDS analysis, respectively. The results showed that optimal values of current density, concentration of particles, and agitation rate exist that maximum percent of particles codeposited in the coating. Also it is demonstrated that using the ultrasonic waves dramatically decrease the agglomeration of particles in the coating. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905467/abstract [article] Synthesis and mechanical properties of nickel-titania composite coatings [texte imprimé] / S. A. Lajevardi, Auteur ; T. Shahrabi, Auteur ; V. Hasannaeimi, Auteur . - 2011 . - pp. 29–34. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 29–34 Mots-clés : Composite  coatings  Electrocodeposition  Nickel  Titania  particles  Ultrasonic  waves Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Nickel-titania composite coatings were prepared under direct current conditions by codeposition of nano titania particles (21 nm) and nickel from a nickel Watts type bath. Current density, concentration of titania particles, effect of agitation, and ultrasonic waves were investigated and the optimum values of these parameters for reaching to maximum vol% of titania particles in the coating were determined. Microhardness of these coatings was investigated by Vickers method and their morphological properties and chemical composition were studied by SEM and EDS analysis, respectively. The results showed that optimal values of current density, concentration of particles, and agitation rate exist that maximum percent of particles codeposited in the coating. Also it is demonstrated that using the ultrasonic waves dramatically decrease the agglomeration of particles in the coating. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905467/abstract

The effect of recrystallization on corrosion and electrochemical behavior of 7150 Al alloy / G. S. Peng in Materials and corrosion, Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 35–40 Titre : The effect of recrystallization on corrosion and electrochemical behavior of 7150 Al alloy Type de document : texte imprimé Auteurs : G. S. Peng, Auteur ; K. H. Chen, Auteur ; H. C. Fang, Auteur Année de publication : 2011 Article en page(s) : pp. 35–40 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : 7150  Al  alloy  Cyclic  voltammetry  EIS  Potentiodynamic  polarization  Weight-loss  measurement Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : By weight loss, potentiodynamic polarization, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS) techniques complemented by optical and scanning electron microscopy observations, the effect of recrystallization on the corrosion, and electrochemical behavior of 7150 Al alloy was studied. The results indicated that the high recrystallization fraction 7150-1# was worse than the low recrystallization fraction 7150-2# on corrosion resistance. The analysis of EIS indicated that 7150-1# exhibited obvious pitting corrosion at 5 h immersion time, whereas 7150-2# showed no obvious pitting corrosion even at 33 h. The corrosion route developed along the grain boundary of recrystallization grains, not along the grain boundary of unrecrystallization grains. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905490/abstract [article] The effect of recrystallization on corrosion and electrochemical behavior of 7150 Al alloy [texte imprimé] / G. S. Peng, Auteur ; K. H. Chen, Auteur ; H. C. Fang, Auteur . - 2011 . - pp. 35–40. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 35–40 Mots-clés : 7150  Al  alloy  Cyclic  voltammetry  EIS  Potentiodynamic  polarization  Weight-loss  measurement Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : By weight loss, potentiodynamic polarization, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS) techniques complemented by optical and scanning electron microscopy observations, the effect of recrystallization on the corrosion, and electrochemical behavior of 7150 Al alloy was studied. The results indicated that the high recrystallization fraction 7150-1# was worse than the low recrystallization fraction 7150-2# on corrosion resistance. The analysis of EIS indicated that 7150-1# exhibited obvious pitting corrosion at 5 h immersion time, whereas 7150-2# showed no obvious pitting corrosion even at 33 h. The corrosion route developed along the grain boundary of recrystallization grains, not along the grain boundary of unrecrystallization grains. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905490/abstract

Corrosion inhibition of 70Cu–30Ni alloy in LiBr+ethylene glycol+H2O mixtures by inorganic compounds / M. A. Ramirez-Arteaga in Materials and corrosion, Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 41–46 Titre : Corrosion inhibition of 70Cu–30Ni alloy in LiBr+ethylene glycol+H2O mixtures by inorganic compounds Type de document : texte imprimé Auteurs : M. A. Ramirez-Arteaga, Auteur ; J. G. Gonzalez-Rodriguez, Auteur ; I. Rosales, Auteur Année de publication : 2011 Article en page(s) : pp. 41–46 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion  Ethylene  glycol  Inhibitor  Lithium  bromide Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion inhibition of a 70 wt% Cu–30Ni alloy in a 55 wt% lithium bromide (LiBr) + ethylene glycol + H2O by inorganic inhibitors has been evaluated at different temperatures by using electrochemical techniques. Inhibitors used included lithium chromate (Li2CrO4), lithium molybdate (LiMoO4), and lithium nitrate (LiNO3), in a concentration of 5 ppm at 25, 50, and 80 °C. Employed techniques included potenthiodynamic polarization curves, linear polarization resistance, and potentiostatic measurements. Results have shown that the alloy had an active–passive behavior at 25 and 50 °C, and the passive film properties were improved with the addition of inhibitors, whereas at 80 °C the inhibitors did not have any effect. Similarly, in general terms, the best corrosion performance at 25, 50, and 80 °C was obtained by adding Li2CrO4, LiNO3, and LiMoO4, respectively. However, the alloy was not susceptible to pitting corrosion in presence of inhibitors but it was highly susceptible towards pitting type of corrosion in absence of inhibitors. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905453/abstract [article] Corrosion inhibition of 70Cu–30Ni alloy in LiBr+ethylene glycol+H2O mixtures by inorganic compounds [texte imprimé] / M. A. Ramirez-Arteaga, Auteur ; J. G. Gonzalez-Rodriguez, Auteur ; I. Rosales, Auteur . - 2011 . - pp. 41–46. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 41–46 Mots-clés : Corrosion  Ethylene  glycol  Inhibitor  Lithium  bromide Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion inhibition of a 70 wt% Cu–30Ni alloy in a 55 wt% lithium bromide (LiBr) + ethylene glycol + H2O by inorganic inhibitors has been evaluated at different temperatures by using electrochemical techniques. Inhibitors used included lithium chromate (Li2CrO4), lithium molybdate (LiMoO4), and lithium nitrate (LiNO3), in a concentration of 5 ppm at 25, 50, and 80 °C. Employed techniques included potenthiodynamic polarization curves, linear polarization resistance, and potentiostatic measurements. Results have shown that the alloy had an active–passive behavior at 25 and 50 °C, and the passive film properties were improved with the addition of inhibitors, whereas at 80 °C the inhibitors did not have any effect. Similarly, in general terms, the best corrosion performance at 25, 50, and 80 °C was obtained by adding Li2CrO4, LiNO3, and LiMoO4, respectively. However, the alloy was not susceptible to pitting corrosion in presence of inhibitors but it was highly susceptible towards pitting type of corrosion in absence of inhibitors. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905453/abstract

Corrosion inhibition of copper in tetra-n-butylammonium bromide aqueous solution by benzotriazole / S. Liu in Materials and corrosion, Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 47–52 Titre : Corrosion inhibition of copper in tetra-n-butylammonium bromide aqueous solution by benzotriazole Type de document : texte imprimé Auteurs : S. Liu, Auteur ; J. M. Duan, Auteur ; R. Y. Jiang, Auteur Année de publication : 2011 Article en page(s) : pp. 47–52 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Benzotriazole  Copper  Inhibition  Tetra-n-butylammonium  bromide Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion inhibition behavior of benzotriazole (BTA) on copper in 17 wt% tetra-n-butylammonium bromide (TBAB) aerated aqueous solution was investigated by weight-loss tests, potentiodynamic polarization, electrochemical impedance spectroscopy, and scanning electron microscopy/energy dispersive X-ray spectroscopy. BTA is a good inhibitor in 17 wt% TBAB solution. The inhibition efficiency of BTA increases with increasing inhibitor concentration, attaining efficiencies of up to 90% calculated according to different methodologies. Adsorption of BTA in 17 wt% TBAB solution on the copper surface was found to obey the Langmuir adsorption isotherm. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905494/abstract [article] Corrosion inhibition of copper in tetra-n-butylammonium bromide aqueous solution by benzotriazole [texte imprimé] / S. Liu, Auteur ; J. M. Duan, Auteur ; R. Y. Jiang, Auteur . - 2011 . - pp. 47–52. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 47–52 Mots-clés : Benzotriazole  Copper  Inhibition  Tetra-n-butylammonium  bromide Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion inhibition behavior of benzotriazole (BTA) on copper in 17 wt% tetra-n-butylammonium bromide (TBAB) aerated aqueous solution was investigated by weight-loss tests, potentiodynamic polarization, electrochemical impedance spectroscopy, and scanning electron microscopy/energy dispersive X-ray spectroscopy. BTA is a good inhibitor in 17 wt% TBAB solution. The inhibition efficiency of BTA increases with increasing inhibitor concentration, attaining efficiencies of up to 90% calculated according to different methodologies. Adsorption of BTA in 17 wt% TBAB solution on the copper surface was found to obey the Langmuir adsorption isotherm. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905494/abstract

Anti-tarnish treatment of brass for coinage (II) color analysis, adsorption model, and quantum chemical calculations / C. Liang in Materials and corrosion, Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 53–60 Titre : Anti-tarnish treatment of brass for coinage (II) color analysis, adsorption model, and quantum chemical calculations Type de document : texte imprimé Auteurs : C. Liang, Auteur ; P. Wang, Auteur ; B. Wu, Auteur Année de publication : 2011 Article en page(s) : pp. 53–60 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : adsorption  model  Brass  EIS  Quantum  chemical  calculation Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The color and gloss of brass before and after anti-tarnish treatment were analyzed with color difference meter, and the inhibition effect of 1-phenyl-5-mercapto-tetrazole (PMTA) film on brass was investigated by means of electrochemical impedance spectroscopy (EIS). It was found that the treatment with PMTA brought few changes to the original color and gloss of brass. The adsorption of PMTA on brass surface obeyed Langmuir adsorption isotherm, it was a spontaneous and exothermic process accompanied by an increase in entropy. Further, quantum chemical calculation was applied to elucidate the corrosion inhibition mechanism of PMTA on brass surface. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905482/abstract [article] Anti-tarnish treatment of brass for coinage (II) color analysis, adsorption model, and quantum chemical calculations [texte imprimé] / C. Liang, Auteur ; P. Wang, Auteur ; B. Wu, Auteur . - 2011 . - pp. 53–60. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 53–60 Mots-clés : adsorption  model  Brass  EIS  Quantum  chemical  calculation Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The color and gloss of brass before and after anti-tarnish treatment were analyzed with color difference meter, and the inhibition effect of 1-phenyl-5-mercapto-tetrazole (PMTA) film on brass was investigated by means of electrochemical impedance spectroscopy (EIS). It was found that the treatment with PMTA brought few changes to the original color and gloss of brass. The adsorption of PMTA on brass surface obeyed Langmuir adsorption isotherm, it was a spontaneous and exothermic process accompanied by an increase in entropy. Further, quantum chemical calculation was applied to elucidate the corrosion inhibition mechanism of PMTA on brass surface. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905482/abstract

Cathodic protection of XL 52 steel under the influence of sulfate reducing bacteria / Garcia-Martinez, R. in Materials and corrosion, Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 61–67 Titre : Cathodic protection of XL 52 steel under the influence of sulfate reducing bacteria Type de document : texte imprimé Auteurs : Garcia-Martinez, R., Auteur ; G. Zavala Olivares, Auteur ; M. J. Hernandez Gayosso, Auteur Année de publication : 2011 Article en page(s) : pp. 61–67 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Cathodic  protection  Electrochemical  impedance  Polarization  resistance  SRB Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The effect of sulfate reducing bacteria (SRB) upon the cathodic protection of XL 52 steel was determined, in order to identify if the potential value of −0.950 V versus copper/copper sulfate electrode is good enough to protect the metal surface. During the experiments, different operational parameters were monitored: hydrogen sulfide production, iron concentration, electrolyte alkalinity, microorganisms' population, as well as the metal surface damage. At the same time, the corrosion rate was determined using two electrochemical techniques: polarization resistance (PR) and electrochemical impedance spectroscopy (EIS). According to the results, it was observed that the protection potential of −0.950 V versus copper/copper sulfate electrode is not enough to control the microbiologically induced corrosion. This situation is reinforced by the fact that significant iron concentration was found in the electrolyte. The microbiological activity is not affected by the protection potential. On the contrary, the population growth is slightly strengthened. The alkalinity generated by the applied potential did not stop the SRB growth. A type of localized corrosion was developed during the experiments with microorganisms, even when the protection potential was applied to the system. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905426/abstract [article] Cathodic protection of XL 52 steel under the influence of sulfate reducing bacteria [texte imprimé] / Garcia-Martinez, R., Auteur ; G. Zavala Olivares, Auteur ; M. J. Hernandez Gayosso, Auteur . - 2011 . - pp. 61–67. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 61–67 Mots-clés : Cathodic  protection  Electrochemical  impedance  Polarization  resistance  SRB Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The effect of sulfate reducing bacteria (SRB) upon the cathodic protection of XL 52 steel was determined, in order to identify if the potential value of −0.950 V versus copper/copper sulfate electrode is good enough to protect the metal surface. During the experiments, different operational parameters were monitored: hydrogen sulfide production, iron concentration, electrolyte alkalinity, microorganisms' population, as well as the metal surface damage. At the same time, the corrosion rate was determined using two electrochemical techniques: polarization resistance (PR) and electrochemical impedance spectroscopy (EIS). According to the results, it was observed that the protection potential of −0.950 V versus copper/copper sulfate electrode is not enough to control the microbiologically induced corrosion. This situation is reinforced by the fact that significant iron concentration was found in the electrolyte. The microbiological activity is not affected by the protection potential. On the contrary, the population growth is slightly strengthened. The alkalinity generated by the applied potential did not stop the SRB growth. A type of localized corrosion was developed during the experiments with microorganisms, even when the protection potential was applied to the system. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905426/abstract

Corrosion protection of stainless steel by separate polypyrrole electrode in acid solutions / J. Hu in Materials and corrosion, Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 68–73 Titre : Corrosion protection of stainless steel by separate polypyrrole electrode in acid solutions Type de document : texte imprimé Auteurs : J. Hu, Auteur ; H. Zhu, Auteur ; Y. Ma, Auteur Année de publication : 2011 Article en page(s) : pp. 68–73 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : 410-stainless  steel  Acid  solution  corrosion  Galvanic  anodic  protection  Polypyrrole Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Galvanic anodic protection (GAP) of stainless steels by doped polypyrrole (PPy) was investigated using chemically synthesized PPy. Separate PPy powder-pressed electrodes with different surface areas were prepared. Electrochemical properties of PPy electrodes were studied by open circuit potentials (OCPs) and potentiostatic polarization. PPy powder-pressed electrodes were coupled with 410-stainless steel electrodes in different concentrations of sulfuric acid solutions, 5 M phosphoric acid solution, and industrial phosphoric acid solution (5 M phosphoric acid + 0.05% chloride ion). Remarkable shift of OCP to the positive direction and sharp decrease of corrosion rate were observed during the coupling experiments, which implies that 410-stainless steel was transferred to passive state. Results also showed that PPy electrode with sufficient surface area can provide corrosion protection to 410-stainless steel electrode in highly corrosive acid solution. Based on the experiment results, GAP provided by PPy and PANi (synthesized under similar conditions) was compared. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905344/abstract [article] Corrosion protection of stainless steel by separate polypyrrole electrode in acid solutions [texte imprimé] / J. Hu, Auteur ; H. Zhu, Auteur ; Y. Ma, Auteur . - 2011 . - pp. 68–73. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 68–73 Mots-clés : 410-stainless  steel  Acid  solution  corrosion  Galvanic  anodic  protection  Polypyrrole Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Galvanic anodic protection (GAP) of stainless steels by doped polypyrrole (PPy) was investigated using chemically synthesized PPy. Separate PPy powder-pressed electrodes with different surface areas were prepared. Electrochemical properties of PPy electrodes were studied by open circuit potentials (OCPs) and potentiostatic polarization. PPy powder-pressed electrodes were coupled with 410-stainless steel electrodes in different concentrations of sulfuric acid solutions, 5 M phosphoric acid solution, and industrial phosphoric acid solution (5 M phosphoric acid + 0.05% chloride ion). Remarkable shift of OCP to the positive direction and sharp decrease of corrosion rate were observed during the coupling experiments, which implies that 410-stainless steel was transferred to passive state. Results also showed that PPy electrode with sufficient surface area can provide corrosion protection to 410-stainless steel electrode in highly corrosive acid solution. Based on the experiment results, GAP provided by PPy and PANi (synthesized under similar conditions) was compared. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905344/abstract

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