Corrosion resistance of a self-healing micro-arc oxidation/polymethyltrimethoxysilane composite coating on magnesium alloy AZ31
Corrosion resistance of a self-healing micro-arc oxidation/polymethyltrimethoxysilane composite coating on magnesium alloy AZ31
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DOI：
10.1016/j.corsci.2017.01.025
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发表时间：
2017-04-01
影响因子：
8.3
通讯作者：
Han, En-Hou
中科院分区：
文献类型：
--
作者：
Cui, Lan-Yue;Gao, Shang-Dong;Han, En-Hou
采用微弧氧化（MAO）工艺制备了一种微弧氧化/聚甲基三甲氧基硅烷（PMTMS）复合涂层。采用FE-SEM、FTIR、XRD、电化学和析氢测试等方法对涂层的表面形貌、化学成分和耐蚀性进行了研究。结果表明，碱处理有利于硅烷处理，PMTMS膜能有效地封闭微弧氧化膜层。由于自修复功能，微弧氧化/PMTMS涂层显著提高了AZ 31合金的耐腐蚀性能。此外，我们还提出并讨论了涂层的腐蚀机制。(C)2017爱思唯尔有限公司版权所有
A micro-arc oxidation (MAO)/polymethyltrimethoxysilane (PMTMS) hybrid coating was fabricated via MAO processing and subsequent sealing with alkaline treatment and PMTMS. The surface morphologies, chemical compositions and corrosion resistances of the coatings were investigated using FE-SEM, FTIR, XRD and electrochemical and hydrogen evolution measurements. The results indicated that the alkaline treatment was beneficial to the silane treatment and that the MAO coating was efficiently sealed by the PMTMS film. The MAO/PMTMS coating significantly enhanced the corrosion resistance of the AZ31 alloy due to its self-healing function. Additionally, we suggest and discuss a corrosion mechanism for the coating. (C) 2017 Elsevier Ltd. All rights reserved.