铝合金表面无铬钝化的研究

摘要

The effects of the mass concentration of sulfuric acid,sodium sulfate,anhydrous cupric sulfate and urea,and passivation temperature as well as passivation time on the corrosion resistance of chrome-free passivation films on aluminum alloy were investigated.Result showed that,the best formula of passivation solution was as follows:sulfuric acid 60～80 g/L,sodium sulfate 40 ～ 60 g/L,anhydrous cupric sulfate 6 ～ 8 g/L,urea 20 ～ 30 g/L,passivation temperature 30～40 ℃,passivation time 10～20 s.%研究了硫酸的质量浓度、硫酸钠的质量浓度、无水硫酸铜的质量浓度、尿素的质量浓度、钝化温度及钝化时间对铝合金表面无铬钝化膜耐蚀性的影响.得到钝化液的最佳配方为:硫酸60～80 g/L,硫酸钠40～60 g/L,无水硫酸铜6～8 g/L,尿素20～30 g/L,钝化温度30～40℃,钝化时间10～20 s.