镁锆合金表面Ni-P非晶化学镀工艺研究

镁锆合金是一种轻质、高阻尼的新型合金,但耐蚀性极差.采用化学镀方法,系统研究了Mg-0.57Zr合金表面Ni-P非晶化学镀的预处理及施镀工艺.研究结果表明:1)采用复合酸洗,有利于提高镀层与基体的结合力、镀层的沉积均匀性和金属光泽度;2)直接化学镀镍比预浸锌后再化学镀镍的工艺方案,更利于提高镀速、降低镀层孔隙率;3)采用所推荐的化学镀工艺,获得了与基体结合力高、孔隙率低、耐蚀性较好的Ni-P非晶镀层,其平均镀速为11.44 μm/h,镀层硬度比合金基体提高10.7倍.

Research on the Amorphous Electroless Ni-P Plating on the Surface of the Mg-Zr Alloy

Mg-Zr alloy,which is a new type of alloy,has many advantages such as lightness,high damping and so on.However,poor corrosion resistance is one of the main causes to restrict its applications.In this paper,pretreatment and process of amorphous electroless Ni-P plating were systemically studied on the surface of Mg-0.57wt%Zr alloy.The results indicated that:(1) compound acid cleaning was propitious to improve the binding strength of coating,uniformity of deposition and metal luster;(2) compared with electroless plating after immersing Zn,direct electroless plating was propitious to increase plating velocity and decrease porosity;(3) the amorphous coating which had high binding strength,low porosity and better corrosion resistance was attained successfully by using proposed technology.The average velocity was equal to 11.44 um per hour.Moreover,the micro hardness increased 10.7 times.