5052铝合金表面化学镀Ni-P镀层的组织与性能

Microstructure and properties of Ni-P coatings prepared bychemical plating on surface of 5052 aluminium alloy

利用化学镀在5052铝合金表面制备了Ni-P镀层,通过SEM、EDS和XRD等手段对镀层表面和界面的形貌、物相、组成、结构和性能进行了表征和分析。结果表明：化学镀Ni-P合金镀层为非晶态,成分以Ni为主,由直径为10~50-m的颗粒组成,颗粒分布较均匀,界面结合状态良好;化学镀对表面粗糙度的影响在500 nm以内,镀后镀层表面粗糙度Ra为384.49 nm;镀层残余应力状态为拉应力,其值达到（521±168.0）MPa。

The Ni-P coating was prepared on the surface of 5052 type aluminium alloy with chemical plating, the surface and interface morphologies, compositions, microstructures and properties were characterized and analyzed by SEM, EDS and XRD, respectively. The results show that the Ni-P alloy coating by chemical plating is in an amorphous state and mainly composed of Ni element. The particles are in the diameters of 10-50μm and evenly distributed. The interface bonding state is good; the affected scope of chemical plating on its roughness is less than 500 nm, and the roughness Ra is 384.49 nm. Its residual stress state is tensile residual stress with value of （521±168.0） MPa.