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 pretreatmen t of electroless nickel plating (EN) on magnesium alloys were studied using weig ht loss method,scanning electron microscopy (SEM) and X-ray photoelectron spectr oscopy (XPS).The results showed that the pretreatment of electroless nickel plat ing on magnesium alloys was a process of one protective film replacing another a nd magnesium was protected all the time.Due to the formation of Mg(OH)2 and Mg F2 film on the surface,alkaline cleaning and activating made little attack to the substrate.Different etching solutions gave different etch rates and resultan t morphologies.The CrOOH- containing film,which was formed during etching,disapp eared after activation.Effects of the changes of surface state during the pretre atment on subsequent EN procedure were also discussed.
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