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Electrocoating of iron and other metals with polypyrrole

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Abstract

Galvanostatic electrodeposition of polypyrrole from more than 20 nonaqueous and aqueous electrolytes containing anions such as BF −4 , ClO −4 , HSO −4 , Tos−, HCO −3 , H2PO −4 , HPO 2−4 , H2BO −3 and NO −3 at the substrates Pt, Au, Cu, Ti, stainless steel/V2A and Fe was investigated. The passivating substrates Pt, Au, Ti and V2A could be electrocoated under a broad variety of conditions. Cu dissolved anodically. The same was true for Fe with only one important exception, namely aqueous nitrate. Smooth, well-adhering polypyrrole layers were obtained on iron at NO −3 concentrations of 0.01–1 M and at current densities of 0.5–10 mA cm−2. The degree of insertion for nitrate ions was abouty=0.25, confirmed by elemental analysis. Current efficiencies with regard to thisy were about 90%. The layers were stable in air for a long time.

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Authors and Affiliations

  1. University of Duisburg, FB 6-Elektrochemie, Lotharstr. 1, D-4100, Duisburg 1, FRG

    M. Schirmeisen & F. Beck

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  1. M. Schirmeisen
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  2. F. Beck
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Schirmeisen, M., Beck, F. Electrocoating of iron and other metals with polypyrrole. J Appl Electrochem 19, 401–409 (1989). https://doi.org/10.1007/BF01015243

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  • DOI: https://doi.org/10.1007/BF01015243

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