环氧涂层中锌铬黄颜料对镁合金的防蚀机理
Inhibition Mechanism of Zinc Chromate in Epoxy Coatings for Magnesium Alloys
摘 要
采用电化学阻抗、动电位极化、开路电位监测和X射线光电子能谱(XPS)等手段, 研究了环氧涂层中锌铬黄颜料对镁合金的腐蚀防护作用, 并分析了其防蚀机理。结果表明, 锌铬黄防锈颜料均匀分散在涂层中, 增强了涂层的屏蔽性能以及涂层与镁合金基体的结合力; 在3% NaCl水溶液中, 锌铬黄是一种阳极型缓蚀剂, 它依靠铬酸根离子的阳极钝化作用形成钝化膜, 阻滞了阳极腐蚀过程, 造成涂层试样开路电位正移, 使涂层试样的阳极极化增大。
环氧涂层
锌铬黄
缓蚀机理
magnesium alloy
epoxy coatings
zinc chromate
inhibition mechanism
Abstract
By means of electrochemical impedance spectroscopy (EIS), dynamic potential polarization, open circuit potential monitoring and XPS, the corrosion protection mechanism of zinc chromate in epoxy coatings for magnesium alloys was studied. The experimental results showed that zinc chromate antirust pigment could be uniformly dispersed in the coatings and improved the shielding effect of the coatings as well as the adhesion force between coating and magnesium substrate. In 3%NaCl solution, zinc chromate was an anodic type corrosion inhibitor. On the surface of the magnesium alloy, passive film was formed by anodic passivation effects of the chromate ions, and thus inhibited the anodic corrosion process and resulted in a positive shift of corrosion potential and an euhacement of anodic polarization of the coated sample.
中图分类号 TG174.46
所属栏目 试验研究
基金项目 教育部科学技术重点项目(No.108129)
收稿日期 2011/5/6
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备注左禹, 教授,
引用该论文: LIU Jing,ZHAO Xu-hui,TANG Yu-ming,ZUO Yu. Inhibition Mechanism of Zinc Chromate in Epoxy Coatings for Magnesium Alloys[J]. Corrosion & Protection, 2012, 33(3): 186
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【2】俞敦义, 史铁京. 用电化学方法评价防锈颜料[J]. 材料保护, 1997, 30(6):1-2.
【3】佐藤靖.防锈、防蚀涂装技术[M]. 北京:化学工业出版社, 1987.
【4】谭勇军, 吴翠兰, 杨华诠. 电化学方法研究有机涂层锌铬黄防锈机理[J]. 涂料工业, 1995(4):7-10.
【5】王泳厚. 实用涂料防腐蚀技术问答[J]. 涂料工业, 1996(1):38-39.
【6】金广泉, 曹跃云. 纳米复合铁钛防锈颜料的研制及产业化进展[J]. 现代涂料与涂装, 2006(4):37-41.
【7】袁爱群, 黄平. 三聚磷酸铝防锈颜料[J]. 四川化工与腐蚀控制, 2000, 2(3):19-21.
【8】Amirudin A. Application of electrochemical impedance spectroscop to study efficiently of anticorrosive pigments in epoxy-polyamide resin[J]. British Corrosion Journal, 1995, 30(2):128-132.
【9】Gordon B, Kerry A, Brian H, et al. Ionic liquid enhanced electrochemical characterization of organic coatings[J]. Progress in Organic Coatings, 2008, 63:250-259.
【10】曹楚南, 张鉴清. 电化学阻抗谱导论[M]. 北京: 科学出版社, 2004.
【11】魏福明, 魏宝明. 金属腐蚀理论及应用[M]. 北京: 化学工业出版社, 2008.
【12】Philip G, Nicholas C, Wayne D. The nature of the chromium species formed during the thermal activation of chromium-promoted tin(IV) oxide catalysts: an EPR and XPS study[J]. J Phys Chem B, 1998, 102:10672-10679.
【13】Yao H B, Li Y, Wee A T S. An XPS investigation of the oxidation / corrosion of melt-spun Mg[J]. Applied Surface Science, 2000, 158:112-119.
【14】Kwo Zong Chong, Teng Shih Shih. Conversion-coating treatment for magnesium alloys by a permanganate-phosphate solution[J]. Materials Chemistry and Physics, 2003, 80:191-200.
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