铁基金属表面苯胺及其衍生物电化学修饰膜的缓蚀作用

研究结果表明,苯胺及其衍生物的电化学修饰膜对铁基金属有很好的保护作用,在氯化钠溶液以及弱酸性和强碱性溶液中有良好的阻蚀性能。18-8不锈钢经修饰后在3％NaCl溶液中的耐孔蚀性能大为提高,在硫酸溶液中的钝化特性明显改善。根据实验结果,探讨了修饰膜的缓蚀机理以及修饰物质的结构、取代基的位置对修饰膜耐蚀性的影响。

A STUDY OF CORROSION RESISTANCE OF ELECTROCHEMICAL MODIFIED FILMS OF ANILINE AND ITS DERIVATIVES ON IRON-BASED ALLOY

Electrochemical modification of surface films on metals is an effective means for anti-corrosion brought forward recently. The modification of aniline and its derivatives on iron-based alloy was investigated in this work. The anti-corrosion performance of modified films was studied in various solutions under different modification conditions by using some electrochemical techniques, such as polarization resistance method, polarization carve and impedance measurements. The surface morphology, composition and structure of modified films were analysed by modern physical analysis techniques, such as AES, XPS, SEM, etc. The results show that the modified films of aniline and its derivatives on iron-based metal surface have good anti-corrosion performance,and pitting resistance and passivity of modified films on 18-8SS are greatly improved. The protection mechanism of modified films and the effect of both structure of modification substances and substitute group position on corrosion resistance were discussed.