Improvement of Corrosion Resistance of 7075 Aluminum Alloy by Micro Arc Oxidation after Hole Sealing Treatment

2022 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) Pub Date : 2022-08-08 DOI:10.1109/3M-NANO56083.2022.9941662

Jian Li, Yiquan Li, Qianqian Cai

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Abstract

Aluminum alloys are widely used in aerospace and marine transportation industries because of their excellent properties. However, the aluminum oxide film on the surface of aluminum alloy in service is easy to be damaged by corrosive media, resulting in matrix corrosion cracking, which also hinders the wide application of aluminum alloy in more fields. In this paper, the PEO/SOT composite coating was prepared by plasma electrolytic oxidation (PEO) combined with surface oiling treatment (SOT). Oiling treatment can effectively cover the discharge channels and cracks on the PEO surface, so as to prevent corrosive ions from contacting through the coating and damaging the aluminum alloy matrix. The corrosion resistance of the composite coating was tested by electrochemical workstation. The results show that PEO/SOT composite coating has better corrosion resistance in corrosive environment than the substrate and PEO coating. This will help to expand the application of aluminum alloy in the field of higher requirements.

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孔封后微弧氧化提高7075铝合金耐蚀性

铝合金因其优异的性能而广泛应用于航空航天和海洋运输行业。然而，在使用中铝合金表面的氧化铝膜容易被腐蚀介质破坏，导致基体腐蚀开裂，这也阻碍了铝合金在更多领域的广泛应用。采用等离子体电解氧化(PEO)和表面上油处理(SOT)相结合的方法制备了PEO/SOT复合涂层。涂油处理可以有效地覆盖PEO表面的放电通道和裂纹，防止腐蚀性离子通过涂层接触而破坏铝合金基体。利用电化学工作站对复合涂层的耐蚀性进行了测试。结果表明，在腐蚀环境中，PEO/SOT复合涂层比基体和PEO涂层具有更好的耐腐蚀性。这将有助于扩大铝合金在更高要求领域的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2022 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO)

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