镁合金自密封等离子电解氧化膜的制备及性能

马宸; 王东; 刘金玉; 彭宁; 尚伟; 温玉清

doi:10.1007/s12613-022-2542-0

Volume 30 Issue 5

May 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(5): 959-969

Chen Ma, Dong Wang, Jinyu Liu, Ning Peng, Wei Shang, and Yuqing Wen, Preparation and property of self-sealed plasma electrolytic oxide coating on magnesium alloy, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 959-969. https://doi.org/10.1007/s12613-022-2542-0

Cite this article as:

Chen Ma, Dong Wang, Jinyu Liu, Ning Peng, Wei Shang, and Yuqing Wen, Preparation and property of self-sealed plasma electrolytic oxide coating on magnesium alloy, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 959-969. https://doi.org/10.1007/s12613-022-2542-0

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研究论文

镁合金自密封等离子电解氧化膜的制备及性能

桂林理工大学化学与生物工程学院，电磁化学功能物质广西区重点实验室，桂林 541004，中国

通讯作者:
尚伟 E-mail: 2001018@glut.edu.cn

温玉清 E-mail: 2006027@glut.edu.cn

文章亮点

(1) 该涂层是通过将四次电压和TiO₂溶胶添加相结合来制备的。

(2) 该自密封涂层的氧化和密封同步进行，比传统的氧化然后密封工艺操作简单。

(3) 该自密封涂层的孔隙率降低，耐腐蚀性能提高。

(4)分析了PEO涂层自密封行为的机理。

中文摘要

等离子体电化学氧化（PEO）是一种应用广泛的在镁合金表面形成陶瓷涂层的表面改性技术。但是，在升压过程中，由于产生的电火花不断破坏涂层，在涂层表面形成微孔和微裂纹，为材料的腐蚀埋下隐患。材料科学中的一个长期追求是开发基于单一材料的自密封涂层，无需先氧化然后密封。因此，本文报道了一种通过四次电压和溶胶添加制备自密封PEO涂层的新方法。通过扫描电子显微镜（SEM）、能量色散X射线光谱（EDS）和X射线衍射仪（XRD）对其形貌和结构进行了表征。使用Image Pro Plus 6.0测定涂层的孔隙率，涂层孔隙率从8.53%降至0.51%。同时，涂层厚度比传统PEO涂层增加了四倍。使用电化学测试评估了每个样品的耐蚀性能，结果表明，该自密封涂层的i_corr从9.152 × 10⁻²降低到6.152 × 10^–4 mA·cm⁻²，样品的R_T从2.19 × 10⁴提高到2.33 × 10⁵ Ω·cm²。盐雾试验表明，涂层表面仅在336 h出现腐蚀点。此外，本文还分析了PEO涂层自密封行为的机理。

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Research Article

Preparation and property of self-sealed plasma electrolytic oxide coating on magnesium alloy

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Abstract

Abstract

Plasma electrochemical oxidation (PEO) is a surface modification technology to form ceramic coatings on magnesium alloys. However, its application is limited due to its defects. This work reports a novel preparation of in-situ sealing of PEO coatings by four-layer voltage and sol addition. The morphology and structure were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffractometer (XRD). Image-Pro Plus 6.0 was used to determine the porosity of the coating, which was decreased from 8.53% to 0.51%. Simultaneously, the coating thickness was increased by a factor of four. The anti-corrosion performance of each sample was evaluated using electrochemical tests, and the findings revealed that the corrosion current density of coatings (i_corr)of the samples were lowered from 9.152 × 10^–2 to 6.152 × 10^–4 mA·cm⁻², and the total resistance (R_T) of the samples were enhanced from 2.19 × 10⁴ to 2.33 × 10⁵ Ω·cm². The salt spray test used to simulate the actual environment showed that corrosion points appeared on the surface of the coating only at the 336 h. In addition, the mechanism of PEO self-sealing behavior was described in this article.
- magnesium alloy;
- in-situ sealing;
- plasma electrolytic oxidation;
- corrosion resistance

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