方波电位幅值和极性对锌铝合金热浸镀层表面三价铬化学转化膜性能的影响  

Effect of square wave potential polarity and amplitude on property of trivalent chromium conversion coating applied on Zn−Al hot-dip coating

作　　者：潘杰 程洋 丁雅静 赵瑞程 蒋涛 冯振亮 李焰 Jie PAN;Yang CHENG;Ya-jing DING;Rui-cheng ZHAO;Tao JIANG;Zhen-liang FENG;Yan LI(School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)材料科学与工程学院,青岛266580

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第10期3067-3082,共16页中国有色金属学报（英文版）

基　　金：financial support from the National Natural Science Foundation of China(No.51979282);the Fundamental Research Funds for the Central Universities of China(No.27RA2108004)。

摘　　要：揭示热浸镀锌铝合金镀层表面Cr(Ⅲ)化学转化膜(TCC)的构建过程,对比研究阴极和阳极方波电位(φp)改善转化膜性能的作用效果。通过EIS和极化曲线测试获得TCC在含氯离子介质中的耐蚀性。结合表面宏/微观3D形貌观察和XPS、AES、FTIR以及拉曼光谱等化学组分分布分析,系统讨论耐蚀性提升与表面组织结构之间的联系。结果表明,阴极方波电位φp相较阳极电位在提高TCC耐蚀性和降低TCC表面Cr(Ⅵ)含量方面的作用更为显著。另外,由于微纳结构的重构,TCC的疏水性以及与环氧底漆之间的结合力得到提升。The formation of Cr(III)chemical conversion coating(TCC)on Zn−Al hot-dip coating was unraveled and cathode or anode square wave potential(φp)was applied during the TCC construction progress in terms of comparatively investigating the effectiveness ofφp.Corrosion resistance of TCC in chloride-containing solution was obtained by EIS and polarization curve measurements,combined with the discussion of macro/micro-morphology using 3D microscope and chemical composition distribution analysis using XPS,AES,FTIR and Raman spectra.The results showed that the cathodeφp enhanced the corrosion resistance and reduced the content of Cr(VI)on the surface of freshly-prepared TCC better than anodeφp.Besides,the hydrophobicity of TCC and adhesion to epoxy primer were also improved due to the reconstruction of the micro−nano structure.

关 键 词：热浸镀层 Cr(Ⅲ)化学转化膜 方波电位 表面粗糙度 

分 类 号：TG174.4[金属学及工艺—金属表面处理]