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Effect of treatment time on a PEO-coated AZ31 magnesium alloy
Materials and Corrosion ( IF 1.8 ) Pub Date : 2021-07-24 , DOI: 10.1002/maco.202112552
Yu Zhang 1, 2 , Yao Chen 1 , Xiangyu Duan 1 , Yanwei Zhao 2
Affiliation  

Plasma electrolytic oxidation (PEO) coatings were formed in a phosphate–silicate-based electrolyte containing K2ZrF6 on an AZ31 Mg alloy. The physical and chemical properties of the coatings were investigated using scanning electron microscopy, atomic force microscopy, X-ray diffraction (XRD), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The results showed that the thickness of the PEO coatings increased linearly with increased treatment times. Additionally, the micropores on the coating surfaces increased in size, but decreased in porosity with increased PEO treatment time. The XRD results showed that the coatings were mainly composed of MgO, MgF2, MgSiO3, and ZrO2, and the electrochemical tests revealed that the corrosion resistance of the coatings increased with increased treatment time. Besides, the EIS results correlated well with the potentiodynamic polarization test results.

中文翻译:

处理时间对 PEO 涂层 AZ31 镁合金的影响

等离子电解氧化 (PEO) 涂层是在AZ31 镁合金上含有 K 2 ZrF 6的磷酸盐-硅酸盐基电解质中形成的。使用扫描电子显微镜、原子力显微镜、X 射线衍射 (XRD)、动电位极化和电化学阻抗谱 (EIS) 研究了涂层的物理和化学性质。结果表明PEO涂层的厚度随着处理时间的增加而线性增加。此外,涂层表面的微孔尺寸增加,但孔隙率随着 PEO 处理时间的增加而减少。XRD结果表明涂层主要由MgO、MgF 2、MgSiO 3和ZrO 2 组成,电化学测试表明涂层的耐腐蚀性能随着处理时间的增加而增加。此外,EIS 结果与动电位极化测试结果具有很好的相关性。
更新日期:2021-07-24
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