AZ91D镁合金表面环境友好直接化学镀镍工艺研究  

Process of environmentally-friendly direct electroless nickel plating on AZ91D magnesium alloy surface

作　　者：宿辉 刘辉 张春波 SU Hui;LIU Hui;ZHANG Chun-bo(College of Materials and Chemical Engineering,Heilongjiang Institute of Technology,Harbin 150050,China;Harbin Zhongfei New Technology Co.,Ltd.,Harbin 150060,China)

机构地区：[1]黑龙江工程学院材料与化学工程学院,哈尔滨150050 [2]哈尔滨中飞新技术股份有限公司,哈尔滨150060

出　　处：《材料工程》2020年第8期163-168,共6页Journal of Materials Engineering

基　　金：哈尔滨市应用技术与开发“优秀学科带头人A类”项目(2016RAXXJ043)。

摘　　要：为高效、环保地提高镁合金的耐蚀、耐磨性能。采用无氟、无铬、无氰、无锌直接化学镀镍方法,在AZ91D镁合金表面制备耐蚀、耐磨沉积层。利用SEM,EDS,XRD及电化学工作站等分别表征沉积前后镁合金表面的形貌、成分、物相及性能。结果表明:主盐-还原剂比例为1:1.4、络合剂浓度为16 g·L^-1、pH=7、温度为(85±0.5)℃,镁合金表面沉积层平整、致密,由细小、均匀的胞状组织组成,主要成分为Ni,P,其中Ni含量为85.25%(质量分数),为非晶态结构。镁合金硬度由72HV(基体)提高到285HV,腐蚀电位由-1.524 V(基体)提高到-0.513 V,腐蚀电流密度降低了约3个数量级。基体与沉积层间结合力良好,无起皮、脱落现象,沉积层厚度约为38μm。In order to improve the corrosion resistance and wear resistance of magnesium alloy efficiently and environmentally,the corrosion resistant and wear resistant coating were prepared on AZ91D magnesium alloy by direct electroless nickel plating without fluorine,chromium,cyanogen and zinc.The surface morphology,composition,phase and corrosion resistance properties were characterized and compared by SEM,EDS,XRD and electrochemical workstation respectively.The results show that the coatings are smooth and compact,consisting of fine and uniform cellular structure being mainly composed of 85.25%(mass fraction)amorphous Ni and P in the ratio of main salt to reductant is 1:1.4,complexing agent concentration is 16 g·L^-1,pH=7 and the temperature is(85±0.5)℃.The hardness is increased from 72HV of substrate to 285HV.Corrosion potential is enhanced from-1.524 V(substrate)to-0.513 V,meanwhile the corrosion current density is decreased by about 3 orders of magnitude.The cohesion between the substrate and the deposition layer is good without peeling and falling off,and the thickness of the deposition layer is approximately 38μm.

关 键 词：镁合金 直接化学镀 AZ91D 环境友好 耐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理]