表面处理对7075铝合金与1J50软磁合金胶接性能的影响

Effece of surface treatment on bonding properties of 7075 aluminum alloy and 1J50 soft magnetic alloy

以7075铝合金板和1J50软磁合金板为研究对象,用光学接触角测试仪和扫描电镜(SEM)研究不同表面处理方式对金属表面微观形貌、湿润性和表面自由能的影响规律,揭示合金单搭接头强化机制。结果表明:喷砂与硫酸阳极化处理通过形成均匀分布凹坑和氧化膜层,提高合金表面粗糙度、润湿性和自由能。1J50软磁合金喷砂前后表面自由能分别为45.7、57.9 mJ/M^(2);7075铝合金经喷砂+阳极氧化复合表面处理后(S4组),表面自由能和剪切强度达极大值,分别为66.5mJ/M^(2)和6.48 MPa,破坏机制由原始的界面失效转化为内聚失效。因此,最佳胶接工艺为7075铝合金喷砂+硫酸阳极氧化处理。1J50合金喷砂处理为最佳表面处理方式。

7075 aluminum alloy and 1J50 soft magnetic alloy plate were studied.The effects of different surface treatment methods on the microstructure,wett ability and surface free energy of metals were studied by optical contact angle tester and scanning electron microscope(SEM),and the strengthening mechanism of single lap joint was reached.The results show that the surface roughness,wettability and free energy of the alloy can be significantly improved by sandblasting and sulfuric acid anodic oxidation treatment through the formation of uniformly distributed pitsand oxide film.The surface free energies of 1J50 soft magnetic alloy before and after sand blasting treatment are 45.7 mJ/M^(2)and 57.9 mJ/M^(2),respectively.The surface free energy and shear strength of 7075 aluminum alloy after sand blasting plus sulfuric acid anodic oxidation treatment reach the maximum values,66.5 mJ/M^(2)and 6.48 MPa.The failure mechanism changes from the original interface failure to cohesive failure.In conclusion,the optimum bonding process is that 7075 aluminum alloy is suitably treated with sand blasting plus sulfuric acid anodic oxidation treatment,and 1J50 soft magnetic alloy is treated by sand blasting.