Ni-P-Al_2O_3复合镀层

Electroless Composite Plating of Ni P Al 20 3 Amorphous Alloy

在以硫酸镍、次亚磷酸钠为主盐的酸性化学镀液中加入氧化铝微粒，通过共沉积获取了在基材表面呈弥散分布的ＮｉＰＡｌ２Ｏ３复合镀层的最佳工艺参数，并讨论了各参数与性能、成分之间的关系。采用光度法分析了镀层成分，其中ｗ（Ａｌ２Ｏ３）为９％～１０％，ｗ（Ｐ）为８％～１１％；采用Ｘ射线衍射仪测定了镀层的结构为非晶态。该镀层经４００℃热处理后，维氏硬度值最高可达１１８２，比ＮｉＰ镀层在该温度下的维氏硬度提高了１５％；磨损实验证实了该温度下耐磨性能提高了４０％，耐蚀性也得到提高。

The technological parameters of electroless composite plating of Ni P Al_2O_3 amorphous alloy were obtained. The relationships between paramters, properties and compositon were also disscussed. The alloy was analysed by weighted method and photometer. The structure of the Ni P Al_2O_3 was determined by x ray. The result shows that the alloy contains (Al_2O_3) 9%～10% and phosphorous (P)8%～11%. After an heating at 400 ℃, the hardness of the alloy is as high as 1 182 HV, which is 15 percent higher than Ni P alloy. The Ni P Al_2O_3 has excellent wear resistance,which has been increased by 40 percent,and corrosion resistance,is also improved.