【摘要】 采用钯盐对SiCp/Al复合材料表面进行活化,化学镀后在复合材料表面获得Ni-P镀层。利用扫描电镜(SEM)、能谱成分分析仪(EDS)、极化曲线、X射线衍射仪(XRD)以及热震测试等手段对镀层的性能进行了研究,并观察了镀覆过程中镀层表面形貌的变化。结果表明:钯盐的活化作用较好,钯原子优先在复合材料的基体晶界、SiCp/Al界面及SiCp表面粗糙处形成催化活化中心;铝合金基体与SiCp增强相表面均被镀覆,且镀层光亮、致密、连续,耐蚀性好,结合力高,属于中磷镀层。更多还原

【Abstract】 A Ni-P coating was obtained on the surface of SiCp/Al composite material after Pd activation and electroplating.The properties of the coating were investigated by means of SEM,EDS,polarization curve,XRD,thermal shock test,etc.,and the changes of the coating surface morphology during plating were also observed.The results show that the composite material is well activated by Pd,Pd atoms preferentially forming a catalytic and active centre in the grain boundary of aluminum alloy matrix,SiCp/Al interface and rough area of SiCp surface.Both the surfaces of aluminum alloy matrix and SiCp reinforcing phase are covered.And the coating is bright,compact and continuous,with a good corrosion resistance and a high binding force,belonging to medium phosphorous coating.更多还原