Assessment of duplex coating combining plasma electrolytic oxidation and polymer layer on AZ31 magnesium alloy
Assessment of duplex coating combining plasma electrolytic oxidation and polymer layer on AZ31 magnesium alloy
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DOI：
10.1016/j.surfcoat.2012.05.091
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发表时间：
2012-06-25
影响因子：
5.4
通讯作者：
Matykina, E.
中科院分区：
文献类型：
--
作者：
Arrabal, R.;Mota, J. M.;Matykina, E.
对经过等离子体电解氧化 (PEO) 预处理的聚合物涂层 AZ31 镁合金进行机械和腐蚀测试。将结果与氟钛酸盐-锆酸盐转化涂层预处理进行比较。机械性能通过标准化附着力 (ISO 2409:2007)、冲击 (ISO 6272-1:2004) 和冲击 + 附着力 (ISO 6272/ASTMD2794) 通过/失败测试进行评估。使用电化学阻抗谱 (EIS)、交流/直流/交流测量以及根据 ASTM B117 连续暴露于盐雾和根据 VDA 621-415 (VDA) 循环暴露来监测腐蚀行为。 PEO + 聚合物涂层的耐冲击性较低，但比 Ti/Zr + 聚合物涂层具有更好的耐腐蚀性。事实证明，在评估所研究涂层的腐蚀性能时，交流/直流/交流程序比 EIS 测量更快。 (c) 2012 Elsevier B.V. 保留所有权利。
Mechanical and corrosion tests were performed on a polymer-coated AZ31 magnesium alloy pre-treated by plasma electrolytic oxidation (PEO). Results were compared with a fluorotitanate-zirconate conversion coating pre-treatment. Mechanical performance was assessed by standardized adhesion (ISO 2409:2007), impact (ISO 6272-1:2004) and impact + adhesion (ISO 6272/ASTMD2794) pass/fail tests. Corrosion behavior was monitored using electrochemical impedance spectroscopy (EIS), ac/dc/ac measurements and continuous exposure to salt fog per ASTM B117 and cyclic exposure per VDA 621-415 (VDA). The PEO + polymer coating revealed lower impact resistance but better corrosion resistance than the Ti/Zr + polymer coating. The ac/dc/ac procedure demonstrated to be faster than EIS measurements for evaluation of the corrosion performance of studied coatings. (c) 2012 Elsevier B.V. All rights reserved.