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<p>By adding NaAlO<sub>2</sub> to the KF-KOH basic electrolyte, coatings were formed on AZ61 Mg alloy by plasma electrolytic oxidation <b>(</b>PEO) process, and AlO<sub>2</sub><sup>−</sup> effects on phase composition, porosity, corrosion and wear resistance of the coating were investigated. This showed that the new phase MgAl<sub>2</sub>O<sub>4</sub> was mainly introduced into the PEO coatings because of the addition of AlO<sub>2</sub><sup>−</sup>, leading to the reduction of porosity, improvement of surface morphology and enhancement of corrosion and wear resistance in this study. When the NaAlO<sub>2</sub> concentration was 15&#xa0;g/L, the sample possessed the best microstructure and performance, with the smallest porosity of 3.23%, the most positive corrosion potential of − 0.93&#xa0;V/SCE, the lowest corrosion current of 4.88 × 10<sup>−8</sup> A cm<sup>−2</sup>, the minimum friction coefficient of 0.55 and the lowest wear rate of 0.88 mm<sup>3</sup>/N m. The results demonstrate that introducing AlO<sub>2</sub><sup>−</sup> in the PEO process is indeed a feasible and effective way to promote the quality of Mg alloy coating.</p>

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AlO2− Effects on Plasma Electrolytic Oxidation Coating of AZ61 Mg Alloy in KF-KOH Electrolyte

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Mengjiao Jin,
  • Peng Zhang,
  • Weiyi Zhang,
  • Xiaoqian Sun,
  • Yunhui Du

摘要

By adding NaAlO2 to the KF-KOH basic electrolyte, coatings were formed on AZ61 Mg alloy by plasma electrolytic oxidation (PEO) process, and AlO2− effects on phase composition, porosity, corrosion and wear resistance of the coating were investigated. This showed that the new phase MgAl2O4 was mainly introduced into the PEO coatings because of the addition of AlO2−, leading to the reduction of porosity, improvement of surface morphology and enhancement of corrosion and wear resistance in this study. When the NaAlO2 concentration was 15 g/L, the sample possessed the best microstructure and performance, with the smallest porosity of 3.23%, the most positive corrosion potential of − 0.93 V/SCE, the lowest corrosion current of 4.88 × 10−8 A cm−2, the minimum friction coefficient of 0.55 and the lowest wear rate of 0.88 mm3/N m. The results demonstrate that introducing AlO2− in the PEO process is indeed a feasible and effective way to promote the quality of Mg alloy coating.