刘　东, 吴振宇，常伟晓，李岩岩，丁一刚

(1 武汉工程大学 化学与环境工程学院, 武汉430073;2 武汉工程大学 绿色化工过程教育部重点实验室, 武汉430073)



电化学合成聚苯胺涂层防护性能的研究

刘东1,2, 吴振宇1，常伟晓1，李岩岩1，丁一刚2,*

(1 武汉工程大学 化学与环境工程学院, 武汉430073;2 武汉工程大学 绿色化工过程教育部重点实验室, 武汉430073)

摘要采用循环伏安法在Q235钢表面电化学合成了聚苯胺涂层，通过极化曲线评价了扫描方式、电位区间、扫描速率、循环次数等电聚合参数对聚苯胺涂层在Q235钢耐腐蚀性能方面的影响,结果表明：合成条件对聚苯胺涂层的防护性能影响显著.在0.1 mol/L 苯胺 + 0.3 mol/L草酸溶液中，循环电位区间- 0.5～1.6 V，扫速10 mV/s，连续扫描5个循环，可获得最佳防护性能.该涂层在3.5 % NaCl溶液中对Q235钢具有较好的保护作用.扫描电镜观察表明：聚苯胺膜具有颗粒状纤维状结构.

关键词Q235钢；聚苯胺薄涂层; 循环伏安; 电化学合成; 极化曲线；耐腐蚀

Study of the Electrochemical Synthesis Conditions on Anti-corrosion Performance of Polyaniline Coating

LiuDong1, 2,WuZhenyu1,ChangWeixiao1,LiYanyan1,DingYigang2,*

(1 School of Chemistry and Environmental Engineering,Wuhan Institute of Technology, Wuhan 430073, China;2 Key Lab for Green Chemical Process of Ministry of Education,Wuhan Institute of Technology, Wuhan 430073, China)

AbstractPolyaniline (PANI) coating was synthesized on Q235 steel by cyclic voltammetry (CV). The effect of electro-polymerization parameters (scan method, potential range, scan rate and cycle number) on anti-corrosion resistance of PANI for Q235 steel were studied from polarization curves. The results showed that synthetic conditions significantly affected the anti-corrosion resistance of PANI. The best protection performance could be obtained by CV between -0.5 and 1.6 V (SCE) with a scan rate of 10 mV/s for 5 cycles in a solution containing 0.3 mol/L oxalic acid and 0.1 mol/L aniline. The PANI coating demonstrated good protective performance in 3.5% sodium chloride solutions. Scanning electron microscopy showed that PANI had granular and fibrous structure.

KeywordsQ235 steel; polyaniline coating; cyclic voltammetry; electrochemical synthesis; polarization curves; anti-corrosion

导电高分子因具有独特的电磁和光学性能备受关注.由于导电高分子可构成一种物理屏障以抵御腐蚀溶液的侵蚀，覆盖在金属表面的聚合物膜能改变底层金属基体的电势减缓腐蚀，故被广泛应用于金属的防护.聚苯胺(PANI)是研究最多的一类导电聚合物，它能通过苯胺在无机酸、有机酸中发生聚合反应制成，其制备方法包括化学聚合和电化学聚合，其中电化学法可一步完成高聚物的聚合、掺杂和成膜，克服了化学法成膜难的问题，简单易行.

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