【摘要】 通过扫描电镜和GDA辉光放电光谱分析仪等手段,研究了压铸镁合金化学镀Ni-P的沉积过程,结果表明镁合金化学镀的前处理使基材表面呈现孔洞结构,活化形成比较平整的疏松网孔状MgF2和AlF3层;镁合金化学镀Ni-P的初始沉积过程,首先是Ni的还原析出,并不含P;随着Ni形核数量的增多和长大,有自催化能力的Ni层产生,镍磷共沉积开始;镀层中存在铬化物、氟化物与镀液成分以及Ni的混杂层。更多还原

【Abstract】 This paper studied the deposit process of electroless Ni-P on die casting magnesium alloys using SEM and GDA spectrum analysis instrument etc. The results indicated that pre-treatment made magnesium alloys surface netted-porous, loose MgF2 and AlF3 layer formed after activation process. The initial deposit process of electroless Ni-P was precipitation of Ni without P atom, followed by Ni nucleating and growing up, the Ni of self-catalysis formed, the nickel phosphorus began to co-deposit. There exited mixing layer composed of complex compound, fluoride, plating liquid and Ni in the initial deposit coating.更多还原