姜文印，周婉秋*，赵玉明，刘晓安，辛士刚，康艳红（沈阳师范大学化学化工学院，辽宁 沈阳 110034）
摘要：为了防止不锈钢双极板在?#39318;?#20132;换膜燃?#31995;?#27744;(PEMFC)工作环境下发生腐蚀，在由0.1 mol/L 苯胺单体与0.2 mol/L H2SO4组成的水溶液中采用循环伏安法在316L 不锈钢(SS)表面电化学合成了导电聚苯胺(PANI)薄膜。采用傅里叶变换红外光谱(FT-IR)分析了PANI 的化学结构，采用扫描电镜(SEM)观察了表面形貌，发现所合成的PANI 具有苯−醌交替的中间氧化态结构，PANI 膜呈现纤维状形貌特征。采用极化曲线和电化学阻抗谱(EIS)对比研究了在0.2 mol/L H2SO4 中氧气对PANI/316L SS 和无涂层316L SS 耐腐蚀性能的影响。结果表明，氧气促进了PANI/316L SS 界面处保护性氧化膜的形成，使PANI/316L SS 体系的耐腐蚀性能提高。
文章编号：1004 – 227X (2019) 04 – 0166 – 08
Effect of oxygen gas on corrosion resistance of polyaniline/316L stainless steel system // JIANG Wen-yin,ZHOU Wan-qiu*, ZHAO Yu-ming, LIU Xiao-an, XIN Shi-gang, KANG Yan-hong
Abstract：In order to prevent stainless steel bipolar plates from corrosion under PEMFC (proton exchange membrane fuel cell) working environment, electrosynthesis was performed on the surface of 316L stainless steel (SS) in an aqueous solution composed of 0.1 mol/L aniline and 0.2 mol/L H2SO4 by cyclic voltammetry. The chemical structure of polyaniline (PANI)was analyzed by Fourier-transform infrared spectroscopy (FT-IR). The surface morphology was observed by scanning electron microscopy (SEM). It was found that the synthesized polyaniline was in an alternating benzene–quinone intermediate oxidation state, and the PANI film showed a fibrous morphology. The effect of oxygen on corrosion resistance of PANI/316L SS and uncoated 316L SS in 0.2 mol/L H2SO4 was studied by polarization curve measurement and electrochemical impedance spectroscopy (EIS). The results showed that oxygen promoted the formation of protective oxide film at the interface of PANI/316L SS, which improved the corrosion resistance of PANI/316L SS system.
Keywords: proton exchange membrane fuel cell; bipolar plate; stainless steel; polyaniline; electrosynthesis; cyclic voltammetry; corrosion resistance; oxygen
First-author’s address: College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China