5083铝合金喷洒式微弧氧化局部膜层的制备及性能  

Preparation and Properties of Local Coatings on 5083 Aluminum Alloy by Spraying Micro-arc Oxidation

作　　者：邱骥[1] 帅刚[1] 马世宁[1] 王红美[1] 蔡嘉辉 

机构地区：[1]装甲兵工程学院装备维修与再制造工程系,北京100072

出　　处：《中国表面工程》2015年第5期105-110,共6页China Surface Engineering

基　　金：装备预先研究项目(51327040101)

摘　　要：以传统浸入式微弧氧化为参照对象,利用自行研制的喷洒式微弧氧化装置在5083铝合金表面局部区域制备一层氧化膜,考察厚度、硬度、粗糙度和电流随时间的变化规律,通过三维形貌仪,扫描电子显微镜(SEM),X射线衍射仪(XRD)分析膜层的微观形貌和组织结构,并在电化学工作站中评价其腐蚀性能,由此比较浸入式和喷洒式微弧氧化的异同,从而证明喷洒式微弧氧化的可行性。结果表明:浸入式和喷洒式微弧氧化制备的膜层相近。其中,膜层厚度、硬度、粗糙度以及电流都随时间呈规律性变化;两者膜层表面不平整,大部分是O和Al元素,主要由γ-Al2O3构成;膜层的电化学性能较铝合金基体都明显改善。因此,在不宜采用浸入式处理方法的环境下,可采用喷洒式微弧氧化代替。Taking the traditional immerging micro-arc oxidation as the reference subject, ceramic coatings were pre- pared on local area of 5083 aluminum alloy by self-developed spraying micro-arc oxidation（MAO） equipment. Changes of thickness, hardness, roughness and current with the time were studied,the micro-morphology and structure of the coating were observed by 3-D morphology analyzer, SEM and XRD, and the corrosion performance was evaluated in electrochemical workstation, thus comparing the difference between the spraying and immerging rnicro-arc oxidation, and proved the feasibility of the spraying micro-arc oxidation. The results show that the coating prepared by spraying and ira- merging micro-arc oxidation is similar. Thickness, hardness, roughness of the coatings and the current changing with time transform regularly. The uneven coating surface, most are O and A1, is mainly composed of γ- Al2O3, and the elec- trochemical properties are significantly improved compared with the aluminum alloy substrate. Therefore, the spraying MAO can be taken instead in the condition which the immerging MAO is not suitable.

关 键 词：铝合金 微弧氧化 喷洒式 局部膜层 电化学 

分 类 号：TG174.44[金属学及工艺—金属表面处理]