Micro-arc oxidation (MAO) is a surface treatment technology that enhances the performance of metal surfaces by growing ceramic layers on the valve metal surface to meet the demand of the application. This paper aims to improve the performance of ceramic coatings on pure aluminum surfaces by varying the concentration of polyethylene glycol (PEG) in electrolytes. As an active agent, the PEG extends the ionic activity, and the increasing rate of ion migration in electrolytes improves the reaction rate. And the PEG long chain is also beneficial to electron conduction, which will promote the discharge effect in the MAO process. The MAO coating was characterized by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), the wear resistance of MAO coating was evaluated by tribological experiments, and the corrosion resistance of MAO coating was evaluated by the Neutral salt spray test (NSST). The experimental results showed that the MAO coating had the best wear resistance when the concentration of PEG was 2 g/L. The coatings prepared by adding PEG to the electrolyte have good wear and corrosion resistance, which enhance the service life and application range of the metal and are expected to promote the development of valve metal in application fields.

微弧氧化（MAO）是一种表面处理技术，通过在阀门金属表面生长陶瓷层来满足应用需求，从而增强金属表面的性能。本文旨在通过改变电解质中聚乙二醇 (PEG) 的浓度来提高纯铝表面陶瓷涂层的性能。作为活性剂，PEG扩展了离子活性，提高了电解质中离子迁移率，提高了反应速率。而且PEG长链也有利于电子传导，会促进MAO过程中的放电效应。采用X射线光电子能谱（XPS）和X射线衍射（XRD）对MAO涂层进行表征，通过摩擦学实验评价MAO涂层的耐磨性，MAO涂层的耐腐蚀性能通过中性盐雾试验(NSST)进行评价。实验结果表明，当PEG浓度为2 g/L时，MAO涂层的耐磨性最好。在电解液中加入PEG制备的涂层具有良好的耐磨性和耐腐蚀性，提高了金属的使用寿命和应用范围，有望推动阀门金属在应用领域的发展。