镁合金化学镀镍层的性能研究  

Properties of Electroless Nickel Coating on Magnesium Alloy

作　　者：单大勇[1] 周婉秋[1] 韩恩厚[1] 柯伟[1] 

机构地区：[1]中国科学院金属研究所腐蚀与防护国家重点实验室,辽宁沈阳110015

出　　处：《材料保护》2004年第3期1-2,共2页Materials Protection

基　　金：863项目 ( 2 0 0 1AA3 3 10 3 0 -0 3 )资助

摘　　要：化学镀镍是镁合金保护的重要手段。为探讨化学镀镍对镁合金的保护效果 ,本文利用电化学极化曲线、X射线衍射和扫描电镜等手段研究了镁合金化学镀镍前处理方法及镀层性能。镁合金上化学镀镍层厚度达到 15μm时已没有惯穿镀层的孔隙 ,2 0 0℃以上热处理可显著提高镀层结合力 ;由于镀层和镁合金间强烈的电偶腐蚀作用 ,在户外或潮湿环境中 ,化学镀镍对镁合金而言是一种有较大风险的防护方法。为获得更好的保护效果 。Electroless nickel coating is an important measure for protection of magnesi am alloy.A pretreatment process of electroless nickel plating on magnesium alloy was developed,and the properties of coating were investigated by means of polarization curves,XRD and SEM.No pores penetrate through the coating while the thickness of nickel layer is higher than 15 μm.Heat treatment above 200℃can greatly improve the adhesion between substrate and coating.Electroless nickel coating is a protection method with higher venture for magnesium alloys used in the aggressive atmosphere environment because of serious galvanic corrosion between coating and magnesium alloy.The multi-layer electroless plating or combination of electroplating and electroless plating is preferable choice that can achieve better protection.

关 键 词：化学镀镍 镁合金 性能 

分 类 号：TQ153[化学工程—电化学工业]