316L不锈钢表面电化学合成聚苯胺及其防护特性

Electropolymerization of PANI on Stainless Steel and Its anti-corrosive performance

在0.3 M草酸与0.1 M苯胺单体组成的水溶液中,用循环伏安法(CV)在316 L不锈钢(SS)表面电化学合成了导电聚苯胺(PANI)薄膜。用傅里叶变换红外光谱(FTIR)对聚苯胺膜进行结构分析,用扫描电子显微镜(SEM)观察表面形貌。结果发现所合成的PANI为具有苯-醌交替的中间氧化态结构,PANI膜呈现细圆颗粒堆积形态。在0.2 M H2SO4中研究了聚苯胺的耐腐蚀性能,结果表明,电化学沉积的聚苯胺膜,其耐腐蚀性能明显高于316L不锈钢,能够对不锈钢基体提供腐蚀保护。

Conducting polyaniline（PANI） coating was electrochemically synthesized on the surface of 316 L stainless steel（SS） by cyclic voltammetry（CV） in aqueous solution containing 0.3 M oxalic acid and 0.1 M aniline. The product was characterized by Fourier Transform Infrared（FT-IR） spectroscopy and Scanning Electron Microscopy（SEM） techniques, it was found that the PANI was in the middle oxidation state containing benzene ring and quinone ring, polyaniline presented in fine particle accumulation form. The corrosion resistance of PANI was studied in 0.2 M H2 SO4. The results showed that the corrosion resistance of polyaniline coating obtained by electrochemical synthesis was significantly higher than that of 316 L SS, so it can provide corrosion protection for stainless steel substrate.