谢治辉.一种无铬低氟的镁合金化学镀镍前处理工艺[J].稀有金属材料与工程,2016,45(1):192~196.[xiezhihui.A Chromium-free and Low Fluoride Pre-treatment Process of Electroless Nickel Plating on Magnesium Alloys[J].Rare Metal Materials and Engineering,2016,45(1):192~196.]
一种无铬低氟的镁合金化学镀镍前处理工艺
投稿时间:2014-01-23  修订日期:2014-06-26
中文关键词:  镁合金,化学镀,酸洗活化,环保,腐蚀
基金项目:四川省教育厅自然科学项目资助(14ZB0147)、化学合成与污染控制四川省重点实验室项目基金资助(CSPC2014-4)和四川省西华师范大学基本科研业务费专项资金(批准号13E006)
中文摘要:
      为了获得一种更加环保的镁合金化学镀镍前处理工艺,本文通过多种方法和手段对比研究了三种不同的酸洗活化工艺对镁合金化学镀镍的影响。其中通过开路电势-时间(OCP-t)曲线解释了不同前处理方法导致不同沉积速度的原因。采用SEM、EDX和XRD分析发现,三种工艺所得镀层均为高磷合金镀层(P含量约为11%),镀层的表面形貌和结构比较接近。动电位极化曲线表明,采用H3PO4+HNO3酸洗,K4P2O7和NH4HF2分别活化的前处理工艺所得镀层耐蚀能力略优于传统工艺镀层。新工艺酸洗液对镁合金存在横向的刻蚀作用,可增强镀层与基底间的机械咬合作用,使得镀层的结合力更强。
A Chromium-free and Low Fluoride Pre-treatment Process of Electroless Nickel Plating on Magnesium Alloys
英文关键词:Magnesium alloys  electroless plating  pickling-activation  environmentally friendly  corrosion
英文摘要:
      The effects of three different pretreatments on direct electroless nickel plating of magnesium alloys have been studied by several methods and techniques in order to obtain an environmentally friendly process of pretreatment. The reason of different pretreatments lead to different deposition rates on magnesium alloy was clarified by open circuit potential-time curves. The surface morphology, chemical composition and structure of these coatings were characterized using SEM, EDX and XRD. The results show that all of these nickel coatings have high P content (about 11%), similar surface morphology and structure. Polarization curves show that the corrosion resistance of the coating obtained by H3PO4+HNO3 pickling, K4P2O7 and NH4HF2 activation, respectively, was slightly stronger than the traditional chromic acid methods. The mechanical occlusive force between the coatings and the substrates was increased result from the etched deep cavities by the new pretreatment. Thus, the adherence between the coating and the substrate was improved ultimately.
作者单位E-mail
谢治辉 西华师范大学 zhihuixie@yeah.net 
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