Ni-Co-P化学镀工艺优化及性能研究

Process Optimization and Performance for Electroless Plating of Ni-Co-P

以A3钢为基底进行化学复合镀Ni-Co-P,采用正交试验法得到了一种Ni-Co-P的最佳配方及工艺条件,并对镀层的形貌、硬度、厚度、结合力、耐蚀性等进行了检测和分析。实验得出了最佳配方及工艺条件:硫酸镍35.0 g/L,硫酸钴4.0 g/L,次亚磷酸钠30.0 g/L,柠檬酸三钠60.0 g/L,硼酸35.0 g/L,乳酸12.0m L/L,十二烷基苯磺酸钠0.05 g/L,硫脲2 mg/L,p H值为7.0,温度90℃,施镀时间2 h。在该条件下,镀层沉积速率较快,可达89.83 g/(m2·h),镀层具有较强的耐蚀性,硫酸铜点滴时间可达285 s;该镀层表面分布均匀,孔隙率分布较小,与基体结合力较好。

A3 steel is used as the base material steel in electroless Plating of Ni-Co-P, The best formula and process conditions are acquired by using the orthogonal experiment methods. The morphology, corrosion resistance, hard- ness, thickness and binding force of coating are tested and analysed. The optimum formula and the technological conditions are required as follows：35.0 g/L NiSO4 · 6H20, COSO4 ·7H20 4.0 g/L, NaH2PO2 · H2O 30.0 g/L, Na3C6H5O7 · 2H2O 60.0 g/L, H3BO3 35.0 g/L C3H6O3 12.0 mL/L, C18H29NaO3S 0.05 g/L, CN2H4S 2 mg/L, pH value of 7.0, the tempera- ture of 90℃, and the plating time of 2 h. Under this condition, the deposition rate is faster, up to 89.83 g/（m2 · h）, the coating has stronger corrosion resistance, copper sulfate drip experiment time is 285 s; the surface of the coating is smooth and uniform;the distribution of porosity is smaller;there is better binding force with substrate.