摘要
为了提升汽车铝合金零部件的表面耐蚀性,采用硫酸铬化学钝化方案,研究了5052铝合金表面钝化工艺及钝化膜的耐蚀性能。探究了钝化液中Cr;(SO;);浓度、K;ZrF;活性剂浓度及钝化时间对钝化质量的影响,并采用中性盐雾试验、硫酸铜点滴试验评价了钝化膜的耐蚀性能。试验结果表明:硫酸铬浓度1.0 g/L,氟锆酸钾浓度2.5 g/L,钝化时间3 min时,钝化膜成膜连续均匀,光泽度好,满足240 h盐雾要求,耐蚀性最佳,可满足汽车铝合金外观件的防腐要求。
In order to improve the surface corrosion resistance of automotive aluminum alloy components, the chemical passivation of chromium sulfate was selected to study the surface passivation process and corrosion resistance of passive film of 5052 aluminum alloy. The influences of the Cr;(SO;);concentration, K;ZrF;active agent concentration in passivation solution, and the passivation time on the passivation quality were investigated. In addition, the corrosion resistance of passive film was studied by neutral salt spray test and cupric sulfate dropping corrosion test. Results showed when the conditions were 1.0 g/L Cr;(SO;);, 2.5 g/L K;ZrF;, and 3 min of the passivation time, the obtained passivation film was continuous, uniform, and had good gloss. The passive film met the requirements of 240 h salt spray test and had the best corrosion resistance, which could meet the anti-corrosion requirements of automotive aluminum alloy appearance parts.
作者
陈二军
党璐玮
CHEN Er-jun;DANG Lu-wei(Automobile Engineering Institute,Shaanxi Heavy Duty Truck Co.,Ltd.,Xi’an 710200,China)
出处
《材料保护》
CAS
CSCD
2022年第1期142-146,共5页
Materials Protection
基金
国家重点研发计划课题(2017YFB0103504)资助。
关键词
铝合金
化学钝化
耐蚀性能
aluminum alloys
chemical passivation
corrosion resistance
