摘要
采用以铝酸盐为主的碱性水溶液,对7075超高强度铝合金进行不同时间的微弧氧化表面处理,通过SEM和XRD对氧化陶瓷层的组织结构进行分析,研究不同微弧氧化时间对显微硬度、磨损性能和电化学性能的影响。结果表明:制备的陶瓷层致密,厚度大于50μm,与基体材料形成冶金结合;陶瓷膜层由γ-Al2O3和α-Al2O3两相组成,其中γ-Al2O3相含量较多,并且随着微弧氧化时间的延长,表面粗糙度增加,α-Al2O3相数量增加,陶瓷层具有高的显微硬度(1 423HV0.1),且抗蚀性和抗耐磨性能增强。
Ceramic oxide coatings were fabricated on 7075 ultra high strength aluminum alloy by micro-arc oxidation（MAO）for different oxidation time in an alkaline aqueous solution with aluminate.The microstructures were investigated by SEM and XRD,and the effect of different oxidation time on micro hardness,wear and electrochemical properties of the ceramic coatings was examined. The results indicate that the prepared ceramic oxide coatings with thickness of more than 50 μm are compact and combined with the substrate very well. The ceramic coatings are composed of both γ-Al2O3 and α-Al2O3 phase,in which the content of γ-Al2O3 phase is higher. The amount of α-Al2O3 phase and hardness of ceramic oxide coatings increase with increasing oxidation time,the ceramic layer has high micro hardness（1 423HV0.1）,and the corrosion resistance and wear resistance of7075 ultra strength Al alloy are enhanced after micro-arc oxidation.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2015年第3期55-58,共4页
Ordnance Material Science and Engineering
基金
广州市对外合作项目资助(2012J5100045)
关键词
铝合金
微弧氧化时间
陶瓷膜层
组织和性能
aluminum alloy
micro-arc oxidation time
ceramic coatings
microstructure and property
