铝合金表面喷涂不锈钢热处理涂层的微观结构及摩擦磨损性能

Microstructure and Friction-wear Properties of Stainless Steel Heat-treatment Coatings on Aluminum Alloy Surface

为提高铝合金耐磨性能并延长铝合金产品的使用寿命,利用电弧喷涂对铝合金进行316 L不锈钢涂层喷涂,喷涂后进行350℃×5 h的热扩散处理。采用OM和SEM进行涂层的微观组织分析,采用EDX对涂层与基体界面进行元素分析,并用维氏硬度计对涂层的硬度进行测试,并分析了涂层的磨损机理。结果表明:经热扩散处理,铝合金与涂层界面出现扩散层,提高了涂层的粘结性能。涂层表面的硬度达325 HV0.3,比铝合金硬度提高了3倍。所制备的涂层能有效提高铝合金的耐磨性,明显减少了铝合金表面的粘着和犁沟磨损,磨损量减少了60%。

To improve the wear resistance and extend the service life of aluminum alloy, 316L stainless steel coating on Al alloy was sprayed by electric arc spraying, and after spraying, the 350 ℃ ×5 h heat diffusion treatment was carried out. The microstructure of the coating was analyzed by OM and SEM. The element analysis at the interface between the coating and the substrate was carriced out by EDX, and the hardness of the coating was tested by Vickers hardness tester. The wear mechanism of the coating was analyzed. The results indicate that after heat diffusion treatment, the diffusion layer can be found at the interface between Al alloy and coating, which can improve the bonding performance of the coating. The surface hardness of the coating is 325 HV0.3, which is 3 times higher than that of aluminum alloy. The prepared coating can effectively improve the wear resistance of Al alloy, the adhesion and ploughing wear on AI alloy surface significantly reduce, and the wear mass loss decreases by 60%.