引用本文:李泽民,王胜民,张俊,赵晓军.氧化石墨烯掺杂对机械镀锌层腐蚀性能的影响[J].中国表面工程,2019,32(6):81~89
LI Zemin,WANG Shengmin,ZHANG Jun,ZHAO Xiaojun.Effects of GO Doping on Corrosion Performance of Mechanical Galvanized Plating[J].China Surface Engineering,2019,32(6):81~89
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氧化石墨烯掺杂对机械镀锌层腐蚀性能的影响
李泽民, 王胜民, 张俊, 赵晓军
昆明理工大学 材料科学与工程学院, 昆明 650093
摘要:
为了增强传统机械镀锌层的耐腐蚀性能，采用机械镀方法，在Q235基体表面制备了Zn-GO纳米薄片复合镀层。利用拉曼光谱、场发射扫描电镜和X射线衍射等表征了复合镀层的表面、截面形貌；采用极化曲线、电化学阻抗谱(EIS)分析了复合镀层浸泡在3.5% NaCl溶液中的电化学行为，并通过中性盐雾加速腐蚀试验测试复合镀层的耐腐蚀性能。结果表明：GO薄片以吸附、镶嵌、夹杂3种方式与锌颗粒共沉积。与未添加GO的镀层相比，GO细化锌粉团使复合镀层更加紧密，同时GO起到电连接作用，可使复合镀层发生钝化现象，自腐蚀电位从-1.189 V正移到-1.130 V，腐蚀电流密度从749 μA/cm2降低到398 μA/cm2；GO具有很好的化学惰性和屏障效应，线性极化电阻增大了5倍；耐盐雾腐蚀试验出现白锈和红锈时间比纯锌镀层分别延长了12 h和140 h。因此，一定含量的GO掺杂能提高锌基镀层的耐腐蚀性能。
关键词:  机械镀  氧化石墨烯(GO)  锌粉  电连接  屏障效应  耐腐蚀性能
DOI：10.11933/j.issn.1007-9289.20190524003
分类号:TG174.44
基金项目:国家自然科学基金（51561017）
Effects of GO Doping on Corrosion Performance of Mechanical Galvanized Plating
LI Zemin, WANG Shengmin, ZHANG Jun, ZHAO Xiaojun
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Abstract:
In order to enhance the corrosion resistance of the traditional mechanical zinc plating, Zn-GO nanosheet composite coating was prepared on the surface of Q235 substrate by mechanical plating. The surface and cross section morphologies of the composite coating were characterized by Raman spectroscopy, field emission scanning electron microscopy and X-ray diffraction. Electrochemical behavior of composite coating immersed in 3.5% NaCl solution was analyzed by polarization curve and electrochemical impedance spectroscopy (EIS). Corrosion resistance of the composite plating was tested by neutral salt spray accelerated corrosion test. The results show that GO flakes are co-deposited with zinc particles in three ways: adsorption, inlay and inclusion. Compared with the coating without GO, GO fine zinc powder group make the composite coating more compact, and GO plays the role of electric connection, which could make the composite coating passivated. The self-corrosion potential moves from -1.189 V to -1.130 V, and the corrosion current density decreases from 749 to 398 μA/cm2. GO has good chemical inertness and barrier effect, and linear polarization resistance increases by 5 times. The time of white rust and red rust is extended by 12 h and 140 h, respectively. Therefore, a certain amount of GO doping can improve the corrosion resistance of zinc-based plating.
Key words:  mechanical deposited  graphene oxide (GO)  zinc powder  electrical connection  barrier effect  corrosion resistance
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