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目的确定快速化学镀Ni-Zn-P合金的工艺。方法通过一系列实验,研究主盐含量、pH值、温度、时间等对镀层沉积速度及镀层锌镍比的影响,确定最优工艺条件。借助SEM,EDS,XRD及电化学方法分析镀层微观形貌、成分及耐蚀性。结果在ZnSO4·7H2O8 g/L,NiSO4·6H2O 35 g/L,NaH2PO2·H2O20 g/L,NH4Cl 50 g/L,C6H5Na3O7·2H2O 70 g/L,稳定剂1.5 mg/L,p H=9.0,温度90~95℃的条件下,化学镀Ni-Zn-P合金沉积速度为5~6μm/h,镀层中Zn质量分数为8%~10%,P质量分数为6%左右,Ni质量分数为80%~85%。Zn的存在使Ni呈现出晶态结构,在XRD谱图上2θ=45°及2θ=52°位置分别出现了Ni(111),Ni(200)衍射峰。施镀时间不会影响镀层成分,但会影响镀层耐蚀性。施镀1.5 h时,镀层厚度约为9~10μm,其耐蚀性略好于相同厚度的Ni-P镀层。结论 Ni-Zn-P化学镀沉积速度较快,8%~10%的Zn使镀层中Ni呈晶态结构,且改善了镀层耐蚀性。
Objective To determine the rapid electroless Ni-Zn-P alloy plating process. Methods Through a series of experiments, the effects of main salt content, pH value, temperature and time on the deposition rate and zinc-nickel ratio of the coating were studied to determine the optimum process conditions. The microstructure, composition and corrosion resistance of the coatings were analyzed by SEM, EDS, XRD and electrochemical methods. The results showed that when the concentration of ZnSO4 · 7H2O8 g / L, NiSO4 · 6H2O 35 g / L, NaH2PO2 · H2O20 g / L, NH4Cl 50 g / L, C6H5Na3O7 · 2H2O 70 g / L, stabilizer 1.5 mg / Under the conditions of 90 ~ 95 ℃, the deposition rate of electroless Ni-Zn-P alloy is 5 ~ 6μm / h, the mass fraction of Zn in the coating is 8% ~ 10%, the mass fraction of P is 6% 80% ~ 85%. The presence of Zn makes Ni show a crystalline structure. Ni (111) and Ni (200) diffraction peaks appear at the positions of 2θ = 45 ° and 2θ = 52 ° on the XRD spectrum respectively. Plating time will not affect the coating composition, but will affect the coating corrosion resistance. 1.5 h plating, the coating thickness of about 9 ~ 10μm, the corrosion resistance slightly better than the same thickness of Ni-P coating. Conclusion The deposition rate of Ni-Zn-P electroless plating is fast, and Zn in the coating is 8% ~ 10% and the corrosion resistance of the coating is improved.