以熔模铸造Mg-9 mass%Zn-3 mass%Al（ZA93）镁合金为基底，分别研究碘离子、乳酸和氟化氢铵对化学镀镍的镀液稳定性和镀层沉积速度的影响规律及其反应机理，并在此基础上优化了镀液配方。用扫描电子显微镜（SEM）、能谱（EDX）和X射线衍射（XRD）等方法对优化镀液中试镀得到的Ni-P镀层的显微组织、相结构以及元素组成进行了分析。结果表明，碘离子与氟化氢铵在一定浓度范围内，可以同时提高镀液的稳定性和镀层沉积速度，但乳酸对镀液的影响机制较为复杂。优化配方镀液的稳定性相对原镀液有了明显的提高，同时保持了较高的镀速，得到的镀层组织均匀、致密和结合良好，为非晶态结构。
The effects of the concentration of iodine ion, ammonium bifluoride and lactic acid on the stability and deposition rate of Ni plating solution have been investigated using investment casting ZA93 alloy as base material. The composition of the plating solution was also optimized. SEM, EDX and XRD have been applied to analyze the microstructure, phase identification, and the elements distribution of the coating. The results showed that the ammonium bifluoride and iodine ion increased both the stability of the plating solution and the deposition rate, but the effect of lactic acid on the plating solution was more complicated. Compared to the former one, the optimized plating solution showed higher deposition rate and was much more stable. The coating was homogeneous, compact with good adhesion to the base and the structure was amorphous.
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