铝合金稀土磷化与铬的磷化之比较.docVIP

铝合金稀土磷化与铬磷化之比较 张圣麟1.2.*张明明1 陈华辉2 1中国矿业大学 机电与信息工程学院 北京 100083 2河南师范大学 化学与环境科学学院 河南省 新乡市 453007 摘 要 采用电化学测试、全浸腐蚀试验和结合力测试，研究了6061铝合金铬磷化处理和以稀土为添加剂的磷酸盐处理所形成的化学转化膜的工艺性能。动力学研究表明,两者的成膜过程是不相同的。极化曲线测试结果显示，在弱极化区范围内，两者抗蚀性能相近，而在强极化区，铬磷化转化膜的抗蚀性优于以稀土为添加剂的磷酸盐化学处理所形成的转化膜,全浸腐蚀实验有类似的结果。结合力测试结果则表明,以稀土为添加剂的磷酸盐化学处理所形成的转化膜与有机涂层间的结合力要优于铬磷化转化膜。 关键词:铝合金；磷化；耐蚀性；结合力； 中图分类号: TG178 文献标识码:A 文章编号：1005-748X（2008）03-000×-0 Comparison of Rare earth Phosphating and Chormic Phosphating on Aluminum Alloy ZHANG Sheng-lin 1.2.* ZHANG Ming-ming2 CHEN Hua- hui1 1. School of Mechanical, Electronic and Information Engineering, China university of MT Beijing P.R. China 100083 2. Chemistry Environmental Science College, Henan Normal University Henan Xinxiang P.R. China 453007 Abstract： In this paper, the technologic performances of the chemical conversion coatings formed on 6061-aluminum alloy with chromic phosphate process and phosphate process taking rare earth as additive was studied by electrochemical measurement, immersing corrosion test and adhesion test. It was discovered from the results of dynamics that both of the forming process were different. The results of polarization curve showed that, in the weak polarized scope, both of the corrosion resistances were close, but in the strong polarized scope, the corrosion resistance of chromic phosphate process was better than that of phosphate process taking rare earth as additive. Immersing corrosion test had the similar results. Adhesion test results indicated that adhesion force between the conversion coatings formed with phosphate process taking rare earth as additive and the organic coating surpassed that of chromic phosphate process. Keywords： Aluminum alloy；Phosphating；Corrosion resistance；Adhension. 铝合金是在铝中加入镁、锌、铜等合金元素，使之具有各种优异的性能，由于铝合金比重小，机械强度大，而被飞机、汽车、家电、仪表、建筑、日用五金等行业大量使用。铝及其合金经化学转化膜处理，可以改善其耐蚀性，也可作为涂装底层和润滑底层。其中涂装底层处理主要：铬酸 (或硫酸)阳极化、阿洛丁化学氧化和磷化处理[1] 等方法。阳极化处理需要电解槽、电源等设施，投资较大，同时阳极化处理也会降低铝合金的机械性能，尤其对抗疲劳性能影响最大；阿洛丁处理对工件表面的前、