7475铝合金阳极氧化膜摩擦与磨损性能（英文）

Friction and Wear Performances of 7475 Aluminium Alloy after Anodic Oxidation

采用阳极氧化法在7475铝合金表面制备一层氧化膜,在摩擦磨损试验机上考察不同载荷情况下氧化膜摩擦磨损性能。利用XPS、扫描电镜、硬度计和X射线应力仪对膜层原子结合能谱、阳极氧化前后表面磨损形貌、表面硬度变化和表面残余应力变化进行了分析。结果表明,阳极氧化后表面较致密,氧化膜是以Al_2O_3形式存在,其界面为扩散型结合形式;阳极氧化后平均摩擦系数减小,摩擦性能得到提高;原始状态试样的磨损机理为粘着磨损,并伴随着磨粒磨损,而阳极氧化后试样的磨损机理为磨粒磨损;表面的高硬度是提高耐磨性能的主要因素。

A layer of oxide film was prepared on the surface of 7475 aluminum alloy by anodic oxidation. The friction and wear performance of the film at different loads were investigated with the friction and wear tests. The atomic binding energy spectrum, the wear morphologies, the surface hardness and the residual stress were analyzed with XPS, SEM, hard meter and XRD stress tester, respectively. The results show that the oxide film on the surface is relatively dense after anodic oxidation, existing in the form of Al2O3, and diffusion type bonding is contained at the interface. The average friction coefficient is decreased after anodic oxidation, indicating that the friction performance is improved. The wear mechanism of the original sample is adhesive wear and tear, accompanied with abrasive wear, and the wear mechanism of the sample after the anodic oxidation is abrasive wear, where high surface hardness is the main factor of the wear resistance.