| 环氧涂层中锌铬黄颜料对镁合金的防蚀机理 |
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| 引用本文： | 刘静,赵旭辉,唐聿明,左禹. 环氧涂层中锌铬黄颜料对镁合金的防蚀机理[J]. 腐蚀与防护, 2012, 0(3): 186-189,230 |
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| 作者姓名： | 刘静 赵旭辉 唐聿明 左禹 |
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| 作者单位： | 北京化工大学材料科学与工程学院 |
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| 基金项目： | 教育部科学技术重点项目(No.108129) |
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| 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。
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| 关 键 词： | 镁合金 环氧涂层 锌铬黄 缓蚀机理 |
Inhibition Mechanism of Zinc Chromate in Epoxy Coatings for Magnesium Alloys |
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| 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, 0(3): 186-189,230 |
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| Authors: | LIU Jing ZHAO Xu-hui TANG Yu-ming ZUO Yu |
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| Affiliation: | (College of Material Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China) |
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| 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. |
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| Keywords: | magnesium alloy epoxy coatings zinc chromate inhibition mechanism |
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