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在化学镀Ni-P/PVDF合金镀液中添加稀土元素Y~(3+)和La~(3+)制备Ni-P/PVDF(RE)复合镀层,用电化学腐蚀测试系统测试复合镀层的耐蚀性,研究了稀土元素的添加量对镀层耐蚀性能的影响。结果表明,在基础镀液中加入适量稀土元素后,所获得的Ni-P/PVDF(RE)复合镀层的晶粒较Ni-P/PVDF镀层更为细小,表面更加均匀和致密;镀层的耐蚀性随着稀土元素加入量的增加呈现先增强后减弱的趋势;在稀土元素的添加量为0.1g/L时,复合镀层的耐蚀性最好。在PVDF微粒和稀土元素的共同影响下,进一步提高Ni-P/PVDF(RE)镀层的耐蚀性。
The composite coating of Ni-P / PVDF (RE) was prepared by adding rare earth element Y ~ (3+) and La ~ (3+) to electroless Ni-P / PVDF alloy plating bath and the electrochemical corrosion test system was used to test the composite coating Corrosion resistance, the effects of rare earth elements on the corrosion resistance of the coating were studied. The results show that the grain size of the Ni-P / PVDF (RE) composite coating is much smaller than that of the Ni-P / PVDF coating and the surface is more uniform and dense after the proper amount of rare earth elements are added into the base plating solution. The corrosion resistance tends to increase firstly and then weaken with the addition of rare earth elements. When the amount of rare earth elements is 0.1 g / L, the corrosion resistance of composite coatings is the best. Under the common influence of PVDF particles and rare earth elements, the corrosion resistance of the Ni-P / PVDF (RE) coating is further improved.