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采用机械研磨化学复合镀工艺在模具锌合金表面获得Ni-P-Al2O3复合镀层,研究镀液成分、纳米Al2O3加入量和工艺条件对镀速的影响.结果表明:硫酸镍、次亚磷酸钠和纳米Al2O3在镀液中的含量均存在极限值,超过极限值后镀速开始下降;在镀液不发生分解时,pH值和温度的提高使镀速迅速上升;机械研磨使镀速显著减小,但玻璃球直径大小对镀速影响不大.优化工艺条件下镀速可达12～13μm/h,在此工艺下获得的镀层硬度高、耐蚀性好.
Ni-P-Al2O3 composite coating was obtained on the surface of the die-cast zinc alloy by mechanical grinding chemical composite plating process to study the influence of bath composition, nano-Al2O3 loading and process conditions on the plating speed.The results show that nickel sulfate, sodium hypophosphite and The content of nano-Al2O3 in the plating solution all had the limit value, and the plating speed started to decrease after exceeding the limit value. When the plating solution did not decompose, the plating speed increased rapidly due to the increase of pH value and temperature. , But the diameter of the glass ball has little effect on the plating rate.The optimal coating speed can reach 12 ~ 13μm / h under the optimal process conditions, and the coating obtained under this process has high hardness and good corrosion resistance.