Abstract
Bi-layered polypyrrole (PPy) coating was investigated for corrosion prevention of steels. The PPy coating consisted of the inner layer doped with PMo 12 O 40 3 - (PMo 12) and HPO 4 2 - ions and the outer layer doped with naphthalenedisulfonate (NDS) ions. PMo 12 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 PMo 12 ions in the inner layer. Corrosion tests were made in 3.5% NaCl aqueous solution for the steels covered by the single PPy–PMo 12, single PPy–NDS, and bi-layered PPy–PMo 12/PPy–NDS coatings. The single PPy–PMo 12 and PPy–NDS coatings maintained the steel in passive state for 34 h and 24 h, respectively. The bi-layered coating kept the steel in passive state and prevented corrosion of the steels for the longer time period.
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