6061铝合金表面稀土铈盐法处理工艺研究

Study on Treatment Process of Rare Earth Ceriometry on Surface of 6061 Aluminum Alloy

采用稀土盐Ce(NO_3)_3·6H_2O作为主盐、H_2O_2为强氧化剂,研究出新型6061铝合金无铬转化工艺,并通过抗蚀性能测试、转化膜膜厚测试等方法对其转化后的耐腐蚀性能进行分析。结果表明,最佳成膜工艺参数,Ce(NO_3)_3·6H_2O浓度为15g·L^(-1);H_2O_2浓度为4m L·L^(-1);处理温度为35℃,处理时间为10 min;pH为3.5。稀土铈转化膜的生成可以显著降低6061铝合金的腐蚀速率,提高金属基体的耐腐蚀性能。

The new surface chromium-free conversion processes of 6061 aluminum alloy is introduced in this paper,and rare earth salt Ce（ NO3）36H2O is used as main salt,H2O2 is strong oxidant. The performance of corrosion resistance is analyzed by measuring corrosion resistance and the film thickness. The results show that the optimum technological conditions,such as concentrations of Ce（ NO3）3·6H2O is 15 g·L^-1,concentrations of H2O2 is 4 m L·L^-1,the temperature is 35℃,the processing time is 10 minutes,pH is 3.5. The corrosion rate of 6061 aluminum alloy can be reduced significantly and the corrosion resistance of metal matrix can be improved by the generation of rare earth cerium conversion film.