In this paper, a new composite coating was prepared on the surface of pure aluminum (Al) by combining the micro-arc oxidation (MAO) technology with the polyethylene glycol (PEG 400) carbonization technology. The composite coating and the single MAO coating were observed by a scanning electron microscope, and an energy-dispersive spectrometer, finding that the single MAO coating surface with volcano-like pores and microcracks, was covered by the carbonized layer of the composite coating where the overall coating thickness was around 19.5 µm, including 17.5 µm of inner MAO coating. The material properties of the composite coating were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The wear resistance of the composite coating was tested under dry friction conditions, finding that the wear width on the composite coating surface was 909.6 µm only, which was around 55.7%, 50.4%, and 58.2% of those for pure Al substrate, single carbonized coating, and single MAO coating, respectively. Then the comprehensive wear resistance of the composite coating was explored under different sliding speeds and lubrication mediums. Finally, the wear-resisting mechanism of the composite coating was discussed, concluding that the composite coating could effectively reduce adhesive wear and abrasive wear of the Al substrate.

中文翻译：

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纯铝表面耐磨碳化陶瓷复合涂层的制备及性能

本文将微弧氧化（MAO）技术与聚乙二醇（PEG 400）碳化技术相结合，在纯铝（Al）表面制备了一种新型复合涂层。通过扫描电子显微镜和能谱仪观察复合涂层和单微弧氧化涂层，发现单微弧氧化涂层表面有火山状孔隙和微裂纹，被复合涂层的碳化层覆盖，其中总涂层厚度约为 19.5 µm，包括 17.5 µm 的内部 MAO 涂层。通过X射线衍射和X射线光电子能谱表征了复合涂层的材料性能。在干摩擦条件下测试了复合涂层的耐磨性，发现复合涂层表面的磨损宽度仅为 909.6 µm，分别约为纯铝基体、单一碳化涂层和单一 MAO 涂层的磨损宽度的 55.7%、50.4% 和 58.2%。然后探讨了复合涂层在不同滑动速度和润滑介质下的综合耐磨性能。最后讨论了复合涂层的耐磨机理，得出复合涂层能有效降低Al基体的粘着磨损和磨粒磨损。