Corrosion protection of steel by bi-layered polypyrrole doped with molybdophosphate and naphthalenedisulfonate anions |
| |
Authors: | Damian Kowalski Mikito Ueda Toshiaki Ohtsuka |
| |
Affiliation: | Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan |
| |
Abstract: | Bi-layered polypyrrole (PPy) coating was investigated for corrosion prevention of steels. The PPy coating consisted of the inner layer doped with PMo12 (PMo12) and 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 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. |
| |
Keywords: | A Polypyrrole A Conductive Polymer C Corrosion Protection |
本文献已被 ScienceDirect 等数据库收录! |