采用微弧氧化方法在硅酸盐电解液里在2219铝合金搅拌摩擦焊接头表面均匀生长一层50 μm陶瓷膜, 分析了铝合金基体和焊缝区陶瓷膜的形貌、相组成和显微硬度分布, 探讨了合金显微组织和微弧氧化膜生长过程的相互影响. 结果表明, 铝合金显微组织对微弧氧化膜的生长影响较小, 铝合金基体和焊缝区的微弧氧化膜特性几乎相同, 陶瓷膜都是由α-Al2O3、γ-Al2O3和莫来石(3Al2O3·2SiO2)相组成; 不同区域膜层的显微硬度相等, 其平均硬度约为HV 1500. 另外, 微弧放电高温过程对膜/基界面附近的铝合金显微组织没有影响.
A ceramic coating of 50 μm thick on the surface of friction stir welding (FSW) joint on 2219 aluminum alloy was fabricated by microarc oxidation (MAO) technique in the silicate electrolyte. The surface morphology, phase constituent and microhardness of the coatings on the parent phase and FSW joint of aluminum alloy were investigated, furthermore the interactions of alloy microstructure and MAO coating growth were analyzed. The results show that the effect of microstructure of aluminum alloy on growth of MAO coating is weak, and the properties of MAO coatings on the parent phase and FSW joint of aluminum alloy are almost same. The ceramic coatings at different zones of joint consist of α-Al2O3, γ-Al2O3 and mullite (3Al2O3·2SiO2) phases. The microhardness of coatings on the parent phase and FSW joint of aluminum alloy is same, which average microhardness is about HV 1500. In addition, the microstructure of aluminum alloy near the coating/alloy interface is not influenced by high-temperature process of microarc discharge.
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