引用本文:莫格,崔学军,张颖君,李明田,宁闯明.AZ31B镁合金表面微弧氧化/聚苯胺改性环氧涂层的腐蚀失效行为[J].中国表面工程,2020,33(2):37~46
Mo Ge,Cui Xuejun,Zhang Yingjun,Li Mingtian,Ning Chuangming.Corrosion Failure Behavior of Micro-arc Oxidation / Polyaniline Modified Epoxy Resin Coatings on AZ31B Mg Alloy[J].China Surface Engineering,2020,33(2):37~46
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AZ31B镁合金表面微弧氧化/聚苯胺改性环氧涂层的腐蚀失效行为
莫格1, 崔学军1,2, 张颖君1, 李明田1, 宁闯明1
1.四川轻化工大学 材料科学与工程学院, 自贡 643000;2.四川轻化工大学 精细化工助剂及表面活性剂四川省高校重 点实验室, 自贡 643000
摘要:
为进一步增强微弧氧化(MAO) 处理后镁合金的耐蚀性能,通过涂装聚苯胺改性环氧树脂( PMER) 制备了 MAO/ PMER 复合涂层,并利用扫描电子显微镜(SEM)、电化学工作站、中性盐雾试验箱等表征手段研究了涂层的结构、 耐蚀性能及其长期腐蚀行为。 结果表明:MAO 涂层样品在盐雾试验第 5 d 时已经出现明显的腐蚀条纹,而复合涂层样品在至少 15 d 后才发生明显的鼓泡现象;与 MAO 涂层样品相比,复合涂层样品的腐蚀电流密度下降了 3 个数量级,极化电阻提高了 2 个数量级,PMER 涂层显著提高了 MAO 涂层对镁合金基体的腐蚀防护能力,并且随着 PMER 涂层厚度从 40 μm 增加到 110 μm,复合涂层的腐蚀防护能力变得更佳。 在 30 天的中性盐雾腐蚀过程中,复合涂层样品的阻抗值在 10~ 1010Ω·cm2内波动,而 MAO 样品在 10 d 后阻抗值降低至 200 Ω·cm2左右。 MAO 涂层易受氯离子破坏而导致涂层失效,而 PMER 涂层不仅起到优异的物理屏障作用,还具有低一定的缓蚀及自修复能力,这将能有效地提高对镁合金 MAO 的后长效防腐寿命。
关键词:  镁合金  微弧氧化  改性环氧树脂  聚苯胺  腐蚀行为
DOI：10.11933/j.issn.1007-9289.20200217001
分类号:TG174.451
文章编号:1007-9289(2020)02-0037-10
文献标识码:A
基金项目:中央引导地方科技发展专项(20208Y0053)； 精细化工助剂及表面活性剂四川省高校重点实验室开放基金(2020JXY05)； 国 家自然科学基金(51801131)
Corrosion Failure Behavior of Micro-arc Oxidation / Polyaniline Modified Epoxy Resin Coatings on AZ31B Mg Alloy
Mo Ge1, Cui Xuejun1,2, Zhang Yingjun1, Li Mingtian1, Ning Chuangming1
1.School of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000 , China;2.Key Laboratories of Fine Chemicals and Surfactants in Sichuan Provincial Universities, Sichuan University of Science and En- gineering, Zigong 643000 , China
Abstract:
To further improve the corrosion resistance performance of micro-arc oxidation (MAO) coated magnesium alloys, the MAO/ polyaniline modified epoxy resin (PMER) composite coatings was fabricated. The structure of the composite coating was investigated by scanning electron microscope ( SEM), their long-term corrosion behavior and corrosion resistance perform- ance were studied by electrochemical workstation and neutral salt spray test chamber. The results show that the MAO coated sam- ples appear corrosion stripe on the 5th day of the salt spray test, while the composite coated samples appear obvious bubble until the 15th day later. Compared with the MAO coated samples, the corrosion current density of the composite coated samples de-crease by about three orders of magnitude, and the polarization resistance increase by about two orders of magnitude. It indicatsthat the PMER layer significantly improved the corrosion protection ability of MAO coatings to the AZ31B magnesium alloy, and the corrosion protection ability of composite coatings become better with the increase of thickness of PMER layer from 40 to 110 μm. In 30 days of neutral salt spray corrosion process, the impedance value of the composite coated samples fluctuates in the range of 109-1010Ω·cm2, while MAO coated samples only remaines around 200 Ω·cm2after 10 days of salt spray corrosion. MAO coatings are easily damaged by chloride ion, which will fail to protect AZ31B magnesium alloy. The PMER layer not only has excellent physical barrier effect, but also has excellent corrosion inhibition and self-repair ability, which can effectively in- crease the long-term anticorrosion life of magnesium alloy after MAO process.
Key words:  magnesium alloy  micro-arc oxidation  modified epoxy resin  polyaniline  corrosion behavior
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