MAO/PMTMS复合涂层对AZ80镁合金电化学腐蚀和应力腐蚀开裂行为的影响

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-08 DOI:10.1016/j.corsci.2025.113308

Xing Qi , Zihan Zhuo , Yafeng He , Xiang Su , Cheng Yang , Bo Jiang , Renguo Song

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引用次数: 0

摘要

采用微弧氧化(MAO)/聚甲基三甲氧基硅烷（PMTMS）相结合的水解处理方法，在AZ80镁合金表面制备了多种微弧氧化(MAO)/聚甲基三甲氧基硅烷（PMTMS）复合涂层。外层PMTMS层密封MAO涂层中的微孔和裂纹，并与MAO涂层交联，形成致密的双层涂层。试验结果表明，MAO/PMTMS涂层能显著提高镁合金的耐蚀性，尤其是MAO/PMTMS3涂层。与基体相比，涂层后AZ80镁合金的腐蚀电位更正，腐蚀电流密度降低了3个数量级，应力腐蚀开裂敏感性（SCC， IUTS）降低了45.9% %。在SSRT过程中，OCP值的变化表明MAO/PMTMS涂层延缓了裂纹的萌生和扩展。

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Effect of an MAO/PMTMS composite coating on the electrochemical corrosion and stress corrosion cracking behavior of an AZ80 magnesium alloy

Various micro arc oxidation (MAO)/polymethyltrimethoxysilane (PMTMS) composite coatings are prepared on an AZ80 magnesium alloy by MAO treatment combined with a hydrolysis reaction. The outer PMTMS layer seals the micropores and cracks in the MAO coating and cross-links with the MAO coating, contributing to a compact double-layer coating. The test results show that the MAO/PMTMS coating can significantly improve the corrosion resistance of the Mg alloy, especially for the MAO/PMTMS3 coating. Compared with that of the substrate, the corrosion potential of the AZ80 magnesium alloy with this coating is more positive, the corrosion current density is three orders of magnitude lower, and its susceptibility to stress corrosion cracking (SCC, IUTS) decreases by 45.9 %. The change in OCP values during the SSRT indicates that the MAO/PMTMS coating retards crack initiation and propagation.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.