期刊
CORROSION SCIENCE
卷 49, 期 3, 页码 1635-1644出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2006.08.018
关键词
polypyrrole; conductive polymer; corrosion protection
Bi-layered polypyrrole (PPy) coating was investigated for corrosion prevention of steels. The PPy coating consisted of the inner layer doped with PMo12 40 (PMo12) and HPO42- ions and the outer layer doped with naphthalenedisulfonate (NDS) ions. PMo12 ions doped in the inner layer make the passive oxide film on steel stabilized and the outer layer doped with large organic ions of NDS restricts decomposition and release of PMo12 ions in the inner layer. Corrosion tests were made in 3.5% NaCl aqueous solution for the steels covered by the single PPy-PMo12, single PPy-NDS, and bi-layered PPy-PMo12/PPy-NDS coatings. The single PPy-PMo12 and PPy-NDS coatings maintained the steel in passive state for 34h and 24h, respectively. The bi-layered coating kept the steel in passive state and prevented corrosion of the steels for the longer time period. (c) 2006 Elsevier Ltd. All rights reserved.
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