铬酸盐预处理铝合金对环境及人体有毒害作用,需探寻能代替其且行之有效的"绿色"表面处理技术.采用酸催化双-[3-(三乙氧基)硅丙基]硫化物(BTESPT)进行水解,以形成的水溶胶作为处理液,采用浸涂法在YL12铝合金表面形成BTESPT涂层,经100℃,12 h固化后通过盐雾试验,以动电位极化和电化学阻抗谱(EIS)法表征了该涂层在3.5%NaCl溶液中的腐蚀特性,并与铬酸盐处理工艺进行了比较.结果表明,BTESPT涂层的耐蚀性能优于铬酸盐转变涂层的耐蚀性,该处理方法基本上能代替铬酸盐预处理.
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