A Novel Mg-Al-Co LDH/ MAO Composite Films on LA103Z Magnesium-Lithium Alloy and Its Active Anti-corrosion Performance

IF 1.5 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS Transactions of the Indian Ceramic Society Pub Date : 2021-10-02 DOI:10.1080/0371750X.2021.2004239

Ju‐mei Zhang, Kai Wang, X. Duan, An‐rong Hou, Jia‐cheng Li, Hui Cai, Zhihu Wang

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引用次数: 2

Abstract

In order to further improve the corrosion resistance of the micro-arc oxidization (MAO) film on LA103Z magnesium-lithium alloy, a Mg-Al-Co layered double hydroxide (LDH) film was fabricated on MAO film by an in-situ hydrothermal method. The results showed that with the extension of hydrothermal treatment time, the dense LDH film sealed the micro-pores and cracks in the MAO film successfully. In addition, LDH film treated with a hydrothermal treatment at 90°C for 24 h has the best electrical insulation. The hydrogen evolution rates (mL.cm–2.h−1) of the LDH/MAO composite films rank as LDH/MAO-24 h ≈ LDH/MAO-30 h (0.12) < LDH/MAO-18 h (0.15) < LDH/MAO-12 h (0.16) < MAO (0.25). Meanwhile, the results of potentiodynamic polarization curves showed that the corrosion potential of LDH/MAO-24 h film increased from –1.5349 to −1.388 V, and the corrosion current density decreased by three orders of magnitude. Therefore, the LDH/MAO film has better corrosion resistance than a single MAO film and adds long-term corrosion resistance to the magnesium alloy, which owes to the sealing effect of LDH on inherent defects and trapping effect on corrosion ions. GRAPHICAL ABSTRACT

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LA103Z镁锂合金表面新型Mg-Al-Co-LDH/MAO复合膜及其主动防腐性能

为了进一步提高LA103Z镁锂合金微弧氧化（MAO）膜的耐蚀性，采用原位水热法在MAO膜上制备了Mg-Al-Co层状双氢氧化物（LDH）膜。结果表明，随着水热处理时间的延长，致密的LDH膜成功地封闭了MAO膜中的微孔和裂纹。此外，经90°C水热处理24小时的LDH膜具有最佳的电绝缘性。LDH/MAO复合膜的析氢速率（mL.cm–2.h−1）为LDH/MAO-24 h≈LDH/MAO-30 h（0.12）＜LDH/MAO-18 h（0.15）＜LDH/MAO-12 h（0.16）＜MAO（0.25），腐蚀电流密度降低了三个数量级。因此，LDH/MAO膜比单一的MAO膜具有更好的耐腐蚀性，并为镁合金增加了长期的耐腐蚀性能，这归因于LDH对固有缺陷的密封作用和对腐蚀离子的捕获作用。图形摘要

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来源期刊

Transactions of the Indian Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

2.40

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Transactions of the Indian Ceramic Society is a quarterly Journal devoted to current scientific research, technology and industry-related news on glass and ceramics. The Journal covers subjects such as the chemical, mechanical, optical, electronic and spectroscopic properties of glass and ceramics, and characterization of materials belonging to this family. The Editor invites original research papers, topical reviews, opinions and achievements, as well as industry profiles for publication. The contributions should be accompanied by abstracts, keywords and other details, as outlined in the Instructions for Authors section. News, views and other comments on activities of specific industries and organizations, and also analyses of industrial scenarios are also welcome.