Abstract Graphene oxide (GO) integrated composite coatings were deposited on AZ91 magnesium alloys by the PEO (Plasma Electrolytic Oxidation) and the treatment which has a post-PEO hydrothermal process. For the first group samples, PEO was performed in the silicate/phosphate-based electrolyte including 5–10 µm in size the GO particles synthesized using the Tour Method. For the second group samples, after PEO treatment, the post-PEO hydrothermal process was carried out in the oven in the GO-distilled water mixture containing GO produced with the same protocol. The effects of GO on wear behavior, structural and morphological features of composite coatings were examined with a pin-on-disc tribometer, X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy, respectively. The results showed that the addition of GO improved significantly the adhesion to the substrate material of composite coatings, increased the coating thickness and hardness. Post-PEO hydrothermal process resulted in the formation of partial a thin solid lubricant GO film on the surface of composite coatings and thus exhibited the best wear and friction resistance.

中文翻译：

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添加氧化石墨烯对AZ91镁合金等离子电解氧化（PEO）复合涂层磨损行为的影响

摘要 通过PEO（等离子电解氧化）和PEO后水热工艺在AZ91镁合金上沉积了氧化石墨烯（GO）集成复合涂层。对于第一组样品，PEO 在硅酸盐/磷酸盐基电解质中进行，包括使用 Tour 方法合成的 5-10 µm GO 颗粒。对于第二组样品，经过 PEO 处理后，PEO 后水热过程在烘箱中在含有 GO 的 GO 蒸馏水混合物中进行，使用相同的方案。GO 对复合涂层的磨损行为、结构和形态特征的影响分别用针盘摩擦计、X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和拉曼光谱进行了检查。结果表明，GO的加入显着提高了复合涂层对基体材料的附着力，增加了涂层厚度和硬度。PEO后的水热过程导致在复合涂层表面形成部分薄的固体润滑剂GO薄膜，从而表现出最佳的耐磨性和耐磨性。