The cold-spray kinetically metallized (CS) carbon nanotube-aluminum (CNT-Al) and pure Al coatings were treated using plasma electrolytic oxidation (PEO) process to obtain CNT-Al+PEO and Al+PEO duplex coatings on AZ91 Mg alloy, respectively. The phase composition, microstructure, mechanical properties, wear and corrosion resistance of the PEO ceramic coatings were studied. The results showed that the PEO ceramic coating was mainly composed of α-Al₂O₃ and γ-Al₂O₃, moreover, the small amount of CNT was also retained during the PEO process. The mechanical properties and wear resistance of the PEO ceramic coatings were significantly improved compared to the respective CS coatings. In particular, the hardness and elastic modulus of the PEO-CNT coating reached 13.9 GPa and 185.4 GPa, which were 21.0% and 23.4% higher than the respective CS coating. Moreover, the wear rate of the PEO-CNT coating was only 4.83 × 10⁻⁵ mm³/N·m with a relatively low coefficient of friction of 0.65, which were 59.8% and 15.6% lower than the corresponding CS coating. The corrosion current density of the PEO-treated CNT-Al coating was 3.734 × 10⁻⁶A/cm², which was similar to the untreated CS coating. In short, the PEO treatment greatly improves the mechanical properties and wear resistance of the CS CNT-Al coating.

使用等离子体电解氧化（PEO）工艺处理冷喷涂动力学金属化（CS）碳纳米管-铝（CNT-Al）和纯铝涂层，在AZ91镁合金上获得CNT-Al+PEO和Al+PEO双相涂层，分别。研究了PEO陶瓷涂层的相组成、微观结构、力学性能、耐磨性和耐腐蚀性能。结果表明，PEO陶瓷涂层主要由α-Al ₂ O ₃和γ-Al ₂ O _{3 组成。}此外，在 PEO 过程中也保留了少量的 CNT。与相应的 CS 涂层相比，PEO 陶瓷涂层的机械性能和耐磨性显着提高。特别是PEO-CNT涂层的硬度和弹性模量分别达到13.9 GPa和185.4 GPa，比各自的CS涂层高21.0%和23.4%。此外，PEO-CNT涂层的磨损率仅为4.83×10 ^-5 mm ³ /N·m，摩擦系数相对较低，为0.65，比相应的CS涂层低59.8%和15.6%。PEO处理的CNT-Al涂层的腐蚀电流密度为3.734×10 ^-6 A/cm ²，这类似于未经处理的 CS 涂层。总之，PEO处理大大提高了CS CNT-Al涂层的力学性能和耐磨性。