Passivation of Stainless Steel by Coating with Poly(o-phenylenediamine) Conductive Polymer
Passivation of Stainless Steel by Coating with Poly(o-phenylenediamine) Conductive Polymer
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DOI：
10.1149/1.2189257
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发表时间：
2006-06
影响因子：
3.9
通讯作者：
A. A. Hermas-A.;Z. X. Wu;M. Nakayama;K. Ogura
中科院分区：
文献类型：
--
作者：
A. A. Hermas-A.;Z. X. Wu;M. Nakayama;K. Ogura
采用循环伏安法，在304不锈钢上，以含邻苯二胺单体的硫酸溶液为电解液，成功地电聚合了聚邻苯二胺（PoPD）。形成具有梯形导电聚合物结构的薄的、粘附的和透明的PoPD层。该层有利于不锈钢在酸性溶液中的钝化。剥离聚合物层后，在酸性溶液中老化得到的底层氧化物进行了研究，并与聚苯胺层下形成的氧化物进行了比较，并通过施加恒定的正电位。与其他受检钝化膜相比，PoPD下的钝化膜在充气3%NaCl中表现出上级耐点蚀性。结果表明，在PoPD下的钝化膜具有高的Cr含量，包括SS的其他成分。该膜已被表征为羟基氧化物结构。在此讨论了PoPD对SS的保护作用。
Poly(o-phenylenediamine) (PoPD) has been successfully electropolymerized by cyclic voltammetery on 304 stainless steel from sulfuric acid solution containing o-phenylenediamine monomer. Thin, adherent, and transparent layers of PoPD which have a ladder conductive polymer structure were formed. The layers facilitated the passivation of the stainless steel (SS) in acid solution. The underlying oxides obtained by aging in acid solution are investigated after peeling off the polymer layers and compared with those formed under polyaniline layers and by applying a constant positive potential. The passive film under PoPD exhibits a superior resistance for pitting in aerated 3% NaCI to other examined passive films. It is shown that the passive film under PoPD has a high Cr content, including other constituents of SS. The film has been characterized as an oxyhydroxide structure. The protection role of PoPD for SS is discussed here.