铝合金环境友好型非铬化学转化表面处理技术的研究

Study of the non-chromate environmental friendly chemical conversion coating on aluminium alloy

为替代有毒的铝合金表面铬酸盐传统处理工艺,研究以Ce(NO3)3为主盐、H2O2为成膜氧化剂的稀土转化膜处理液,采用正交试验优化转化膜制备工艺,探讨SrCl4、NH4VO3两种成膜促进剂对改善成膜效果的影响,通过SEM、EDX、XRD等微观分析,对表面转化膜的微观形貌与成分组成进行分析。研究结果表明,通过氧化剂的引入与工艺优化可以在40℃低温下生成有较好外观与耐蚀性的转化膜,处理溶液中添加一定浓度的成膜促进剂能够改善成膜效果,转化膜的主要元素组成为Al与Ce的氧化物。

In order to substitute the traditional chromate treatment,a process to form an environmental friendly coating on aluminum alloys was developed by the use of the Ce（NO3）3 as the main salt and H2O2 as the oxidant. An orthogonal experiment was conducted to optimize the preparing parameters of the coating-formation, and two coating-formation accelerants of SrCl4, NH4VO3 were added to the preparing solution to improve the formed coating performance. SEM,EDX and XRD were used to study the coating surface morphology and composition, Results of the experiment show that the coating-formation accelerant plays a positive role in the coating performance, and the coating with a good corrosion-resistance and appearance grows quickly at the solution temperature of 40℃.