钝化液中金属杂质对镀锌层三价铬钝化的影响  

Effects of metal impurities in passivator on trivalent chromium passivation of electroplated zinc coating

作　　者：奚军生 袁景追 喻岚 严寒 刘威 王帅星[2] 唐华 杜楠[2] XI Junsheng;YUAN Jingzhui;YU Lan;YAN Han;LIU Wei;WANG Shuaixing;TANG Hua;DU Nan(AECC Guizhou Honglin Aero-engine Control Technology Corporation Ltd.,Guiyang 550009,China;School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;AVIC Chengdu Aircraft Industrial(Group)Co.,Ltd.,Chengdu 610092,China)

机构地区：[1]中国航发贵州红林航空动力控制科技有限公司,贵州贵阳550009 [2]南昌航空大学材料科学与工程学院,江西南昌330063 [3]航空工业成都飞机工业(集团)有限责任公司,四川成都610092

出　　处：《电镀与涂饰》2024年第6期117-122,共6页Electroplating & Finishing

基　　金：中国航空发动机集团产学研合作项目(HFZL2020CXY026)。

摘　　要：[目的]研究金属杂质离子对镀锌三价铬钝化效果的影响,为钝化液中金属杂质离子含量的控制提供参考。[方法]采用添加不同质量浓度的Fe^(2+)、Cu^(2+)和Zn^(2+)的三价铬钝化液对镀锌层进行钝化处理。通过三维视频显微镜、动电位极化曲线测试等研究了上述3种金属杂质离子对钝化膜外观及耐蚀性的影响。[结果]钝化液中Fe^(2+)的质量浓度超过0.1 g/L或Cu^(2+)的质量浓度超过0.03 g/L时即可导致钝化膜不均匀、颜色变暗甚至起粉,以及耐蚀性显著变差。钝化液中Zn^(2+)质量浓度小于2 g/L时对钝化膜外观和耐蚀性影响不大,但不小于4.0 g/L时会导致钝化膜耐蚀性严重下降,因此钝化液中Zn^(2+)的质量浓度应控制在4.0 g/L以内。[结论]3种金属杂质均会导致钝化膜性能下降,必须严格控制三者在钝化液中的含量。[Introduction]The effects of metal impurity ions on trivalent chromium passivation of electroplated zinc coating need to be studied to provide reference for controlling the concentration of metal impurity ions in passivator.[Method]Trivalent chromium passivation was conducted on the surface of electroplated zinc coating in a passivator with different mass concentrations of Fe^(2+),Cu^(2+),or Zn^(2+).The effects of the above three kinds of metal impurity ions on the appearance and corrosion resistance of passivation film were studied by three-dimensional video microscopy and potentiodynamic polarization curve measurement.[Result]When the mass concentration exceeded 0.1 g/L for Fe^(2+)or 0.03 g/L for Cu^(2+)in passivator,the passivation film became ununiform,dark,or even powdering,as well as showed a significant deterioration in corrosion resistance.Zn^(2+)had little effect on the appearance and corrosion resistance of passive film when the mass concentration of Zn^(2+)was lower than 2 g/L.The mass concentration of Zn^(2+)should be controlled lower than 4.0 g/L,or else the corrosion resistance of passive film would be seriously degraded.[Conclusion]The three kinds of metal impurities studied in this paper can lead to a decrease in properties of trivalent passive film,it is necessary to strictly control their concentrations in passivator.

关 键 词：电镀锌 三价铬钝化 金属杂质 外观 耐蚀性 

分 类 号：TQ153.6[化学工程—电化学工业]