【摘要】 利用微弧氧化技术在7N01-T5铝合金搅拌摩擦焊(FSW)接头表面制备陶瓷涂层.通过SEM和XRD技术测试微弧氧化涂层的微观形貌、物相组成等,并采用中性盐雾试验研究微弧氧化及封孔处理对焊接接头耐蚀性能的影响.结果表明,微弧氧化可在FSW接头区域生成均匀的陶瓷涂层;陶瓷涂层表面残留许多火山口状放电微孔和熔融烧结痕迹,并且主要由α-Al2O3与γ-Al2O3两相构成;微弧氧化涂层具有较好耐腐蚀性,沸水封孔能生成水合氧化铝,使孔壁膨胀、孔径变小,进一步增强涂层的耐蚀能力,经96 h盐雾腐蚀后的单位面积失重量仅为2.6 mg.更多还原

【Abstract】 The ceramic coatings were prepared on surface of friction stir welded joint of 7N01-T5 aluminum alloy by micro arc oxidation technology.The morphology and phase constituent of the micro arc oxidation coatings were studied by SEM,XRD.The corrosion resistance of the friction stir welded joint oxidized and sealed was tested through the neutral salt spray(NSS) test.The results show that micro arc oxidation coating formed on the FSW joint is uniform,and there are many discharge micro-porous like crater and melting,sintering traces on the surface,and which are mainly composed of α-Al2O3 and γ-Al2O3 phase.Micro arc oxidation ceramic coating has excellent corrosion resistance.Boiling water seal treatment can generate a hydrated alumina,which makes the hole wall inflated and the pore size decreaed,the corrosion resistance of the coatings can be greatly enhanced,and the weight loss is only 2.6 mg after enduring 96 h in NSS test.更多还原