摘要
采用重量损失、扫描电镜和Ｘ射线光电子能谱等方法对镁合金化学镀镍预处理的表面状况进行了研究。结果表明,镁合金在碱性除油和活化阶段由于表面上Ｍｇ(ＯＨ)２和ＭｇＦ２膜层的形成,受到的腐蚀很小,不同配方的酸性浸蚀溶液导致不同的腐蚀程度和表面形貌,浸蚀后表面形成的含ＣｒＯＯＨ的膜层在活化后消失。
Changes of the surface state during the pretreatment of eiectroless nickel plating (EN) on magnesium alloys were studied using weight loss method, scanning electron microscopy (SEM) and X - ray photoelectron spectroscopy (XPS). The results showed that the pretreatment of eiectroless nickel plating on magnesium alloys was a process of one protective film replacing another and magnesium was protected all the time. Due to the formation of Mg(OH)2 and MgF2 film on the surface, alkaline cleaning and activating made little attack to the substrate. Different etching solutions gave different etch rates and resultant morphologies. The CrOOH - containing film, which was formed during etching, disappeared after activation. Effects of the changes of surface state during the pretreatment on subsequent EN procedure were also discussed.
出处
《中国腐蚀与防护学报》
CAS
CSCD
2001年第6期340-344,共5页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金项目(50101007)
关键词
化学镀镍
镁合金
预处理
表面形貌
electroless nickel plating, magnesium alloy, pretreatment, surface
