Protective properties of redox polymer film deposited on stainless steel |
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Authors: | Mariusz?T?Galkowski Email author" target="_blank">Pawel?J?KuleszaEmail author Krzysztof?Miecznikowski Malgorzata?Chojak Henryk?Bala |
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Institution: | (1) Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland;(2) Division of Chemistry, Department of Process and Materials Engineering and Applied Physics, Czestochowa University of Technology, Al. Armii Krajowej 19, 42-200 Czestochowa, Poland |
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Abstract: | We propose a novel composite organic-inorganic coating in the form of a redox polymer film for protection of stainless steel against general corrosion in strong acid medium (2 M H2SO4). We utilize an anion exchange polymer, protonated poly(4-vinylpyridine), into which hexacyanoferrate anions have been introduced. Owing to the presence of Fe(CN)63–/4– at the interface formed by the film and the steel, a sparingly soluble metal hexacyanoferrate (mostly Prussian blue, PB) is formed as an overcoating on the steels surface, presumably on the passive (metal oxide) layer. The redox polymer film on the steel seems to act as a composite three-dimensional bilayer-type coating in which hexacyanoferrate(III,II) anions (that are capable of effective charge storage) exist in the outer portions of the film, whereas the inner PB layer improves the systems overall adherence and stability. By analogy to a conducting polymer (e.g. polyaniline, polypyrrole), introduction of the redox polymer composite film leads to stabilization of the steel substrates potential within the passive range.Contribution to the 3rd Baltic Conference on Electrochemistry, Gdansk-Sobieszewo, Poland, 23–26 April 2003Dedicated to the memory of Harry B. Mark, Jr. (28 February 1934–3 March 2003) |
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Keywords: | Corrosion protection Hexacyanoferrate Poly(4-vinylpyridine) Prussian blue Stainless steel |
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