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Titre :
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Corrosion protection of stainless steel by separate polypyrrole electrode in acid solutions (2011)
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Auteurs :
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J. Hu, Auteur ;
H. Zhu, Auteur ;
Y. Ma, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Materials and corrosion (Vol. 62 N° 1, Janvier 2011)
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Article en page(s) :
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pp. 68–73
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Note générale :
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Génie Mécanique
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Langues :
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Anglais
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Index. décimale :
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620.1 (Essais des matériaux. Défauts des matériaux. Protection des matériaux)
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Tags :
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410-stainless steel Acid solution corrosion Galvanic anodic protection Polypyrrole
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Résumé :
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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.
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DEWEY :
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620.1
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ISSN :
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0947-5117
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En ligne :
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http://onlinelibrary.wiley.com/doi/10.1002/maco.200905344/abstract
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