研究了铝硅合金基体化学镀Ni-Co-P镀层的工艺对镀层性能的影响.通过正交试验,得出镀液pH值、硫酸镍、硫酸钴以及次磷酸钠的含量对镀层厚度、硬度和成分的影响规律,发现增大镀液pH值和增加硫酸镍含量、次磷酸钠含量适中、降低硫酸钴含量,有利于增加镀层膜厚;增大镀液pH值、硫酸镍和次磷酸钠含量适中、降低硫酸钴含量,有利于提高镀层硬度.%The influence of electroless plating process parameters on the performances of Ni-Co-P coating on a hyper-eutectic Al-Si casting alloy is studied by orthogonal experiment. The effects of process parameters, such as pH and the component in electroless plating bath on the performance of Ni-Co P layer, such as the thickness and hard-ness,have been obtained. It is indicated that the thickness of Ni-Co P electroless plated layer increases with the increase of pH and the NiSO4 · 6H2O concentration, the moderate NaH2PO2 · H2O concentration, and the decreasing of the CoSO4· 7H2O concentration. The hardness of coating can be increased by increasing pH, using the moderate NiSO4 · 6H2O concentration and NaH2 PO2· H2O concentration, and decreasing the COSO2 · 7H2O concentration.
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