AZ31镁合金表面化学镀镍工艺研究

腐蚀科学与防护技术, 2009, 21(4): 370-373.

AZ31镁合金表面化学镀镍工艺研究

石西昌杨慧兰肖湘徐徽陈白珍杨喜云

中南大学冶金科学与工程学院

School of Metallurgical Science and Engineering

Central South University

Changsha 410083

基金项目: 国家科技攻关项目（2005BA639C）

关键词： AZ31镁合金 , electroless plating , Ni-P , corrosion resistance

ELECTROLESS NICKEL PLATING ON AZ31 MAGNESIUM ALLOY SURFACE

SHI Xi-chang

Keywords： AZ31 magnesium alloy , 化学镀 , Ni-P , 耐蚀性

研究了在AZ31镁合金表面直接化学镀镍工艺,得到了镀液的最佳配方,镀液的成分为25 g/L NiSO₄•6H₂O、25 g/L次亚磷酸钠、15 g/L柠檬酸、10 g/L NH4F、1 mg/L硫脲.在温度为85℃、pH=9.0、反应时间1小时条件下可以在AZ31镁合金表面得到性能良好的NiP合金化学镀层,镀层厚度超过10 μm.用SEM、XRD和EDS研究了镀层的形貌和物相组成;在3.5%NaCl水溶液中通过测定Tafel极化曲线研究了镀层的耐腐蚀性能.结果表明,Ni-P镀层比基体AZ31镁合金的耐腐蚀性能有极大的提高.

It was studied that the process of direct electroless plating on the surface of AZ31 magnesium alloy.The optimum formula of the bath is NiSO₄·6H₂O 25 g/L,NaH₂PO₂·H₂O 25 g/L,citric acid 15 g/L,NH4F 10 g/L and thiourea 1 mg/L.The good electroless plated coating consisted of Ni-P was obtained in the bath with pH=9.0 at 85℃ for 1 hour.The thickness of the electroless plating is more than 10 μm.The morphology of the nickel-phosphorus coating was studied using SEM.Its phase constituent and composition were examined by XRD and EDS.The corrosion behavior of the nickel-phosphorus coating was studied by Tafel polarization in a 3.5% NaCl solution.The results showed that nickelphosphorus coatings had a significantly better corrosion resistance than AZ31.

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