Microstructure and Corrosion Resistance of Plasma Electrolytic Oxidized Recycled Mg Alloy

Acta Metallurgica Sinica (English Letters) - Tập 35 - Trang 961-974 - 2021
You Lv1,2, Chao Zhang3, Yupeng Zhang1,2, Qishi Wang1, Xinxin Zhang1,2, Zehua Dong1,2
1Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, China
2Hubei Engineering Research Centre for Biomaterials and Medical Protective Materials, Huazhong University of Science and Technology, Wuhan, China
3China Railway Major Bridge Engineering Group Material and Equipment, Supply Co. Ltd., Wuhan, China

Tóm tắt

The wide application of Mg is hindered by its low corrosion resistance, especially for recycled Mg. In this work, a novel plasma electrolytic oxidation (PEO) process was conducted on a recycled Mg alloy with a high content of Al (~  2.3 wt%), which results in a polycrystalline PEO coating. The PEO coating displays a three-layered structure with a uniform elemental distribution. Unlike the outer layer decorated by channels of micrometre scales, the middle layer mainly contains submicron-sized pores associated with plasma discharges, whereas the fine pores originated from oxygen evolution were detected in the inner layer. The electrochemical measurements, hydrogen evolution tests and salt spray tests were conducted, indicating the superior corrosion resistance of PEO-coated recycled Mg alloy. Hence, the purposed PEO method could dramatically enhance the corrosion resistance of recycled Mg, which may broaden its application in the future.

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