碳酸盐添加剂对Mg–9Li–3Al合金等离子电解氧化涂层显微组织和耐蚀性的影响

靳思远; 马晓春; 巫瑞智; 李廷取; 王甲秀; Boris L Krit; 侯乐干; 张景怀; 王桂香

doi:10.1007/s12613-021-2377-0

Volume 29 Issue 7

Jul. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(7): 1453-1463

Siyuan Jin, Xiaochun Ma, Ruizhi Wu, Tingqu Li, Jiaxiu Wang, Boris L Krit, Legan Hou, Jinghuai Zhang, and Guixiang Wang, Effect of carbonate additive on the microstructure and corrosion resistance of plasma electrolytic oxidation coating on Mg–9Li–3Al alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1453-1463. https://doi.org/10.1007/s12613-021-2377-0

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Siyuan Jin, Xiaochun Ma, Ruizhi Wu, Tingqu Li, Jiaxiu Wang, Boris L Krit, Legan Hou, Jinghuai Zhang, and Guixiang Wang, Effect of carbonate additive on the microstructure and corrosion resistance of plasma electrolytic oxidation coating on Mg–9Li–3Al alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1453-1463. https://doi.org/10.1007/s12613-021-2377-0

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研究论文

碳酸盐添加剂对Mg–9Li–3Al合金等离子电解氧化涂层显微组织和耐蚀性的影响

1)
哈尔滨工程大学超轻材料与表面技术教育部重点实验室，哈尔滨 150001，中国
2)
吉林化工学院材料科学与工程学院，吉林 132022，中国
3)
黑河学院理学院，黑河 164300，中国
4)
Moscow Aviation Institute, National Research University, Moscow 125993, Russia

通讯作者:
巫瑞智 E-mail: rzwu@hrbeu.edu.cn

李廷取 E-mail: ltq2000@163.com

文章亮点

(1) 在电解液中添加 Na₂CO₃ 有效地改变了Mg–Li合金表面的PEO涂层的微观结构。

(2) 碳酸盐的加入使涂层在涂层中生成更稳定、更耐腐蚀的Li₂CO₃。

(3) 碳酸盐的加入可有效提高涂层的耐腐蚀性能，可延长涂层的长期保护能力。

中文摘要

等离子电解氧化技术因其工艺简单、电解液环保、硬度高、涂层结合力等优异性能而受到广泛关注。但由于强放电和气体的逸出造成涂层多孔，在长时间的腐蚀过程中很容易丧失对基体的保护能力。因此将碳酸盐添加到硅酸盐体系电解质中以提高 Mg–9Li–3Al (wt%, LA93) 合金上等离子电解氧化涂层的耐腐蚀性。采用扫描电子显微镜、能谱仪、X射线衍射和X射线光电子能谱研究了碳酸盐对涂层形貌、结构和相组成的影响。涂层的耐腐蚀性通过电化学实验、析氢和浸渍试验来评价。结果表明，碳酸盐的加入导致涂层更致密，硬度增加，并形成了耐腐蚀的Li₂CO₃相。电化学实验表明，与不含碳酸盐的涂层相比，碳酸盐涂层的腐蚀电位正移（24 mV），腐蚀电流密度降低了约一个数量级。添加碳酸盐的涂层具有较高的耐腐蚀性和长期保护能力。

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Research Article

Effect of carbonate additive on the microstructure and corrosion resistance of plasma electrolytic oxidation coating on Mg–9Li–3Al alloy

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Abstract

Abstract

Carbonate was added to the silicate system electrolyte to improve the corrosion resistance of the plasma electrolytic oxidation coating on Mg–9Li–3Al (wt%, LA93) alloy. The influences of carbonate on the morphology, structure, and phase composition of the coating were investigated by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, and X-ray photoelectron spectroscopy. The corrosion resistance of the coating was evaluated by electrochemical experiment, hydrogen evolution, and immersion test. The results showed that the addition of carbonate resulted in a denser coating with increased hardness, and the corrosion-resistant Li₂CO₃ phase was formed. Electrochemical experiments showed that compared with the coating without carbonate, the corrosion potential of the carbonate coating positively shifted (24 mV), and the corrosion current density was reduced by approximately an order of magnitude. The coating with carbonate addition possessed a high corrosion resistance and long-term protection capability.
- Mg–Li alloy;
- plasma electrolytic oxidation;
- corrosion resistance;
- carbonate

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