Zr-Al合金化学镀Ni-P镀层工艺研究

摘要

采用化学镀技术在经磷化处理后的A1含量为8.0％(质量分数)的Zr-A1合金表面进行施镀,得到了表面镀覆均匀、为明显胞状物的非晶Ni-P镀层.并对镀层进行显微硬度测试、电化学腐蚀极化行为、XRD和SEM分析.研究确定了磷化液的配方:H3PO4为15 g/L(质量浓度,下同),ZnSO4为3 g/L,NaF为1.5 g/L,有机胺(硫脲)为0.15 g/L,pH值为2.5～3.0,温度为45℃,时间为2 min;镀液配方:NiSO4为20 g/L,Na H2PO2为40 g/L,(NH4)2SO4为40 g/L,CH3COONa为40 g/L,(CH3COO)2Pb为1 mg/L,控制pH值为5.5～6.0,温度为80℃,施镀1h.结果表明,Zr-Al合金化学镀Ni-P后镀层的耐蚀性能、显微硬度显著提高.%The purpose of this paper is to get the electroless Ni-P plating on the surface of Zr-8 Al alloy. The Ni-P plating was even, cystiform and amorphous. The ingredient of phosphating solution was obtained as follows: 15 g/L H3PO4, 3 g/L ZnSO4, 1. 5 g/L NaF, 0.15 g/L organic amine. Phosphating was carried at 45℃ for 2 minutes with pH value of 2. 5～3. 0. The ingredient of electroless bath was: 20 g/LNiSO4,40 g/LNaH2PO2, 40 g/L(NH4)2SO4,40 g/L CH3COONa, 1 mg/L (CH3COO)2Pb. Electroless plating was carried at 80℃ for 1 hour with pH value of 5. 5～6. 0. From microhardness, electrochemical polarization, XRD and SEM results, it is shown that the corrosion resistance and microhardness of Zr-Al alloy with Ni-P plating were remarkably improved.