镁合金化学镀Ni-Cu-P,Ni-Ce-P镀层耐蚀性能的研究

摘要

在AZ 91D镁合金基体上分别制备三元化学镀Ni-Cu-P,Ni-Ce-P镀层,用失重法将试样分别放入质量分数为3.5％的NaCl溶液和质量分数为5％的醋酸溶液中进行耐蚀性对比实验.结果表明:相对于AZ 91D基体,Ni-Cu-P镀层和Ni-Ce-P镀层在质量分数为5％的醋酸溶液中耐蚀性分别提高了50倍和12.8倍,在质量分数为3.5％的NaCl溶液中分别提高了2.76倍和91.63倍；经封孔和热处理封孔后的耐蚀性均有明显提高.实验表明:在AZ91D镁合金表面化学沉积Ni-Ce-P镀层的综合耐蚀性能优于化学沉积Ni-Cu-P镀层的.该实验有助于解决镁合金的耐蚀性问题、提高其表面性能和拓宽其应用前景.%The ternary electroless Ni-Cu-P and Ni-Ce-P coatings were prepared respectively on AZ 91D magnesium alloy substrate. Their samples were put into NaCl solution with a mass concentration of 3. 5 % and acetate solution with a mass concentration of 5 % respectively to perform a comparative experiment for testing their corrosion resistance by weight loss method. The results show that the corrosion resistances of the Ni-Cu-P and Ni-Ce-P coatings in 5 % acetate solution have been improved by 50 and 12. 8 times respectively; in the NaCl solution with a mass fraction of 3. 5 % by 2. 76 and 91. 63 times respectively! And the corrosion resistances of both coating have been improved remarkably after pore sealing and heat treatment sealing. The experiment shows that the comprehensive corrosion resistance of Ni-Ce-P coating on AZ 91D surface is superior to that of Ni-Cu-P coating. This experiment is helpful to solving corrosion, improving surface performance, broadening its application prospect and other key problems for magnesium alloys.