化学镀Ni-P-ZrO_2工艺及性能

Process and properties of electroless plating Ni-P-ZrO_2 alloy

以NiSO4 为施镀主盐 ,次亚磷酸钠为还原剂研究了化学镀法在工件表面获得良好性能的Ni P ZrO2 镀层的工艺 .用正交试验法确定了镀液的最佳成分 ,考察了施镀温度、搅拌速度、ZrO2 微粒的添加量对镀层形成的影响 ,并用X射线衍射和电子探针对镀层的结构进行了分析 .结果表明 ,镀液的最佳组成为 :NiSO4 30g·L-1,配合剂 18g·L-1,稳定剂 2g·L-1,次亚磷酸钠 2 0g·L-1,促进剂 15g·L-1;施镀工艺条件为 :施镀温度 85～ 90℃ ,ZrO2 微粒加入量 10～ 2 0g·L-1,在施镀过程中采用间歇式搅拌法 ;经过 30 0℃以下的热处理后镀层结构仍为非晶态结构 ,经过 30 0℃以上的热处理后 ,则变为晶体结构 ;用以上方法获得的镀层为高磷镀层 .此外 ,用浓度为 10 % (质量分数 )的盐酸检验镀层的耐蚀性 ,结果表明ZrO2 微粒的加入不会影响Ni P基质层的抗蚀性 .因此 ,采用本工艺能获得性能优良的Ni P ZrO2 合金镀层 ,且性能比Ni

Using NiSO_4 as dissolving salt, NaH_2PO_4 as reductant in the solution, the process of electroless plating of Ni-P-ZrO_2 alloy was studied. The solution′s composition was set up with the orthogonal layout. The composition of the solution were as follows: NiSO_4 30 g·L -1, accessory ingredient 18 g·L -1, stabilize 2 g·L -1, NaH_2PO_4 20 g·L -1, accelerant 15 g·L -1. It is found that temperature, speed of stirring and content of ZrO_2 particles have effects on the forming of the claddig. By X-ray analysis, the Ni-P-ZrO_2 cladding remains amorphous material with heat treating below 300 ℃, but above 300 ℃, the cladding becomes crystal. The tissue and construction of the cladding have an effect on the properties of the cladding. The results of cladding corrosion resistance test show that ZrO_2 particles have effects on the cladding corrosion resistance, a fine Ni-P-ZrO_2 cladding could be prepared by the process, and its properties were obviously better than that of Ni-P alloy.