Fabricating a corrosion-protective Li2CO3/Mg(OH)2 composite film on LA141 magnesium‑lithium alloy by hydrothermal method

材料科学 腐蚀 溶解 合金 镁合金 图层(电子) 复合数 层状结构 冶金 双层 扫描电子显微镜 热液循环 复合材料 化学工程 生物 工程类 遗传学
作者
Fangping Mou,Zhongwei Wang,Hao Zeng,Yanlong Ma,Fei Guo,Linjiang Chai,Zuxin She,Lunwu Zhang
出处
期刊:Surface & Coatings Technology [Elsevier BV]
卷期号:472: 129939-129939 被引量:7
标识
DOI:10.1016/j.surfcoat.2023.129939
摘要

Magnesium‑lithium (MgLi) alloys are currently the lightest metallic structural materials. However, their chemical activity is significantly increased by Li element which leads to poor corrosion resistance. The spontaneously formed Li2CO3 film in natural environments on MgLi alloy has a corrosive protection effect, however, it is not dense and thick enough and could only provide limited protection. In this study, a Li2CO3/Mg(OH)2 composite film was fabricated on LA141 MgLi alloy by using hydrothermal method to improve its corrosion resistance. The growth process of the film was observed by X-ray diffraction (XRD) and second electron microscope (SEM). The corrosion protection performance and failure mechanism of the film were investigated with electrochemical methods. The experimental results showed that the corrosion rate of the alloy was decreased by 98.93 % with the protection of the as-prepared film. The film had a bilayer structure: the inner layer was dense and had a higher Li2CO3/Mg(OH)2 ratio, and the outer layer was loose and had a lamellar structure with a lower Li2CO3/Mg(OH)2 ratio. The corrosion protection performance was mainly provided by the inner layer. During the failure process, the outer layer of the film first underwent uniform dissolution, followed by local damage on the inner layer.
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