聚苯胺修饰镍电极的防腐蚀性能  

Preparation of Polyaniline-Modified Nickel Electrode and Evaluation of Its Anticorrosion Behavior

作　　者：张淑英[1] 阮北[2,3] 武克忠[3] 

机构地区：[1]中国人民武装警察部队学院基础部,河北廊坊065000 [2]北京科技大学冶金与生态工程学院,北京100083 [3]河北师范大学化学与材料科学学院,河北石家庄050024

出　　处：《材料保护》2013年第6期25-27,50,共4页Materials Protection

基　　金：国家自然科学基金(21246006);河北省自然科学基金(B2012205034);河北师范大学应用开发基金(L2011K04)资助

摘　　要：为了扩大导电聚合物聚苯胺的应用范围,采用循环伏安法在镍电极表面电化学合成聚苯胺(PANI),制备了聚苯胺修饰镍(PANI-镍)电极。用极化曲线、开路电位-时间曲线及交流阻抗谱分析了PANI-镍电极的防腐蚀性能。结果表明:与镍电极相比,PANI-镍电极的自腐蚀电位正移了150 mV,自腐蚀电流降低为原来的1/19;PANI-镍电极在3%NaCl溶液浸泡4 000 min后PANI膜逐渐失去作用,16 000 min后开始大面积剥离;PANI膜对镍电极的保护机理是屏蔽作用。Polyaniline( denoted as PANI) was synthesized by cyclic voltammetry and then coated onto the surface of nickel electrode to afford Ni electrode modified by PANI( denoted as PANI-Ni).The anticorrosion behavior of as-prepared PANI-Ni electrode was evaluated in relation to measurements of polarization curve,open circuit potential-time curve,and electrochemical impedance spectrum.Results showed that,the corrosion potential of PANI-Ni electrode rose by about 150 mV as compared with that of un-modified Ni electrode,and its corrosion current declined to one nineteenth of that of un-modified Ni electrode.In the meantime,PANI coating of PANI-Ni electrode gradually failed after immersion in 3% NaCl solution for 4 000 min,and flaked off in large area after immersion in the same medium for 16 000 min.Moreover,PANI coating functioned to protect Ni electrode via shielding mechanism.

关 键 词：聚苯胺修饰镍电极 循环伏安法 交流阻抗谱 极化曲线 防腐蚀性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]