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在含有不同浓度纳米Cr_2O_3微粒的硅酸盐体系电解液中对2024-T4铝合金进行微弧氧化处理,使用SEM观察陶瓷膜的表面形貌、截面形貌、磨痕形貌。使用EDS能谱仪分析膜层中各主要成分沿截面方向的分布,使用XRD分析陶瓷膜的相结构,使用纳米压痕硬度计测量陶瓷膜的硬度,使用粗糙度仪测量陶瓷膜的表面粗糙度,使用摩擦磨损试验机测量陶瓷膜的摩擦系数,使用激光共聚焦显微镜测量磨痕体积,评估磨损率。结果表明:在电解液中加入纳米Cr_2O_3微粒后,制备的陶瓷膜中出现了Cr_2O_3相,电解液中纳米Cr_2O_3微粒浓度达到2.4 g/L时,陶瓷膜的硬度最高,摩擦系数最小,磨损率最低,耐磨性最好。
The 2024-T4 aluminum alloy was treated by micro-arc oxidation in silicate electrolyte containing different concentrations of nano-Cr 2 O 3 particles. The surface morphology, cross-sectional morphology and wear scar morphology of the ceramic film were observed by SEM. The distribution of the main components in the film along the cross-section was analyzed by EDS EDS. The phase structure of the ceramic film was analyzed by XRD. The hardness of the ceramic film was measured by nanoindentation hardness tester. The surface roughness of the ceramic film was measured by using a roughness tester , The friction coefficient of the ceramic film was measured using a friction and wear tester, the wear scar size was measured using a laser confocal microscope, and the wear rate was evaluated. The results show that the Cr_2O_3 phase appears in the prepared ceramic membrane after the nano-Cr_2O_3 particles are added into the electrolyte. When the concentration of nano-Cr_2O_3 particles in the electrolyte reaches 2.4 g / L, the ceramic membrane has the highest hardness, the lowest friction coefficient and the lowest wear rate , The best wear resistance.