镁合金表面化学镀Ni-P和Ni-P-SiC的对比  

Comparative Study of Electroless Ni-P and Ni-P-SiC on AZ91D Magnesium Alloy

作　　者：沟引宁[1] 黄伟九[1] 朱翊[1] 

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054

出　　处：《表面技术》2014年第1期16-20,43,共6页Surface Technology

基　　金：重庆市教委科技研究项目(KJ070602)~~

摘　　要：目的提高镁合金的耐磨性、耐蚀性,扩大其应用领域。方法采用"磷酸+钼酸铵酸洗→HF活化"的方法进行前处理,直接在AZ91D镁合金表面化学镀Ni-P合金镀层和Ni-P-SiC复合镀层。对两种镀层的表面和截面形貌、成分、结构、硬度、耐蚀性及耐磨性进行了系统比较。结果在Ni-P合金镀层中引入SiC粉末后,镀层的胞状颗粒细化,硬度提高至643HV,但其腐蚀电流密度有所增大。结论与Ni-P合金镀层相比,Ni-P-SiC复合镀层的耐蚀性有所下降,但耐磨性能大大提高。Objective To improve the corrosion resistance and wear resistance of AZ91D magnesium alloy. Methods Ni-P-SiC composite coating and Ni-P coating were directly fabricated by electroless plating using phosphoric acid ＋ ammonium molybdate pickling and HF activation. For comparison, electroless Ni-P coating was prepared at the same time. The morphology, composi- tion, structure, hardness, corrosion resistance and wear resistance of the two coatings were compared systematically. Results The cellular grains of coating were refined by adding SiC powder. SiC phase appeared in the Ni-P-SiC composite coating without chan- ging the basic structure of Ni-P alloy. The hardness of the Ni-P-SiC composite coating reached up to 643HV. The corrosion current density increased slightly in terms of the Ni-P alloy coating. Conclusion Compared with the Ni-P coating, the corrosion resistance of the Ni-P-SiC composite coating declined slightly, but its wear resistance increased greatly.

关 键 词：镁合金 化学镀 NI-P Ni-P-SiC 耐蚀性 耐磨性 

分 类 号：TQ153.2[化学工程—电化学工业]