Study on performance of Ni-P-Cr composite coating prepared by combination of electroless plating and pack cementation
The method of pack cementation was applied to prepare a chromized layer on the surface of an electroless Ni-P coating to further improve its mechanical property and corrosion resistance,and then the microstructure,chemical composition,and performance of the achieved coatings were investigated.The results indicated that the double-layered Ni-P-Cr composite coating was composed of an inner Ni-P layer and an outer Cr-Ni-P layer.Meanwhile,the thickness of the composite coating become larger and more Cr was found as chromizing time increased.By comparison,the double-layered coating with the chromizing time of 9 h showed a higher hardness than electroless Ni-P coatings and double-layered coatings with a shorter chromizing time.In addition,all the double-layered coatings generally displayed higher corrosion resistance than electroless coatings.Also,increasing chromizing time was beneficial to reduce the defects of the double-layered coatings ascribed to the dense oxide film,and thus improved corrosion resistance.
Double-layered Ni-P-Cr composite coating Electroless plating Pack cementation Mechanical property Electrochemistry Corrosion resistance
王勤英 徐姣 刘双 唐怡荣 林元华 西宇辰 白树林
西南石油大学材料科学与工程学院,成都 610500 北京大学工学院,北京 100871
国内会议
四川自贡
英文
37-45
2018-05-25（万方平台首次上网日期，不代表论文的发表时间）