铝合金中温直接化学镀镍

Direct Electroless Nickel Plating on Aluminum Alloys at Medium Temperature

为了实现铝合金在中温(70℃)条件下直接化学镀镍,在化学镀液中加入活化剂(含氟化合物),并对主配合剂进行调整.适宜浓度的活化剂可以加快化学沉积镍的速度,改善镀层的综合性能;氨基乙酸为主配合剂,能明显改善镀层的耐蚀性能,提高了镀层腐蚀电势,降低腐蚀电流,增强镀层的抗色变性能;在含有2g.dm-3 KF和8g.dm-3氨基乙酸的镀液中化学镀镍,能得到综合性能良好的Ni-P镀层.

In order to realize direct electroless nickel plating on aluminum alloy under the middle tem- perature of 70 ℃, an activator （fluoride） was added and the main complexing agent was adjusted in the chemical bath. Appropriate concentration of activator can accelerate the electroless nickel plating and im- prove the comprehensive performance of coatings. When citric acid was replaced by aminoacetic acid as the main complex agent, the corrosion resistance of coating was obviously improved. The corrosion potential increased, the corrosion current decreased and the resistance of color degeneration was also obviously en- hanced. The Ni-P coatings with good comprehensive performance were produced in the bath containing 2 g · dm^-3 KF and 8 g ·dm-3 aminoacetic acids.