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Characterization of the passive inorganic interphase and polypyrrole coatings formed on steel by the aqueous electrochemical process

1999; Wiley; Volume: 71; Issue: 12 Linguagem: Inglês

10.1002/(sici)1097-4628(19990321)71

1097-4628

Jude O. Iroh, Wencheng Su,

Corrosion Behavior and Inhibition

Journal of Applied Polymer ScienceVolume 71, Issue 12 p. 2075-2086 Characterization of the passive inorganic interphase and polypyrrole coatings formed on steel by the aqueous electrochemical process Jude O. Iroh, Corresponding Author Jude O. Iroh Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012===Search for more papers by this authorWencheng Su, Wencheng Su Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012Search for more papers by this author Jude O. Iroh, Corresponding Author Jude O. Iroh Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012===Search for more papers by this authorWencheng Su, Wencheng Su Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012Search for more papers by this author First published: 04 February 1999 https://doi.org/10.1002/(SICI)1097-4628(19990321)71:12 3.0.CO;2-QCitations: 46Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Polypyrrole coatings have been successfully formed on steel from aqueous oxalic acid-pyrrole solutions by electrochemical polymerization. Formation of the coatings was found to be dependent on the pH of the reaction solution and the applied current. In acidic medium, the formation of polypyrrole was characterized by an induction (passivation) period before electropolymerization of pyrrole. At the end of the induction period, a crystalline passive interphase was formed. The morphology and composition of the electrodeposited passive interphase and the resultant polypyrrole coatings were investigated by scanning electron microscopy, reflection-absorption infrared spectroscopy, and X-ray photoelectron spectroscopy. Our results reveal that the chemical composition of the passive interphase was similar to that of iron(II) oxalate dihydrate, FeC2O4 · 2H2O, crystals. 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