Benzoxazine/Micro-Arc Oxidation High-Temperature-Resistant Composite Coating With Superior Corrosion Protection Performance on Magnesium Alloy

IF 2.7 3区化学 Q2 POLYMER SCIENCE

Journal of Applied Polymer Science Pub Date : 2025-02-09 DOI:10.1002/app.56817

Hongxia Zhu, Xuejun Cui, Sicheng Peng, Yuming Qi, Yiqing Xia, Qingchuan Ren, Fei Cheng

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Abstract

In this study, to seal the pores of a micro-arc oxidation (MAO) coating, benzoxazine (BZ) is used to form a highly heat-resistant MAO/BZ composite coating with excellent anti-corrosion performance on a magnesium alloy. The as-prepared BZ coating, which has a static water contact angle of 111.52° ± 2.6°, is bonded firmly to the MAO coating and can withstand a temperature of 300°C. The results of electrochemical tests indicate that the composite coating prepared by BZ with a concentration of 40% demonstrates a low corrosion current density of 9.01 × 10⁻¹² A cm⁻² in a 3.5 wt.% NaCl aqueous solution. Moreover, the composite coating exhibits an outstanding corrosion resistance after a neutral salt spray test for 82 days. Furthermore, it is concluded that an increased concentration of BZ can significantly increase the coating thickness with a dense curing crosslinking structure, which is a key factor in the corrosion protection of MAO coatings.

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来源期刊

Journal of Applied Polymer Science 化学-高分子科学

CiteScore

5.70

自引率

10.00%

发文量

1280

审稿时长

2.7 months

期刊介绍： The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.