| 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。 |
| 关键词: 铝合金 微弧氧化 喷洒式 局部膜层 电化学 |
| DOI：10.11933/j.issn.1007-9289.2015.05.016 |
| 分类号: |
| 基金项目: |
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| Preparation and Properties of Local Coatings on 5083 Aluminum Alloy by Spraying Micro-arc Oxidation |
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QIU Ji, SHUAI Gang, MA Shining, WANG Hongmei, CAI Jiahui
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Department of Equipment Maintenance and Remanufacturing, Academy of Armored Forces Engineering
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| Abstract: |
| Taking the traditional immerging microarc oxidation as the reference subject, ceramic coatings were prepared on local area of 5083 aluminum alloy by selfdeveloped spraying microarc oxidation(MAO) equipment. Changes of thickness, hardness, roughness and current with the time were studied，the micromorphology and structure of the coating were observed by 3D morphology analyzer, SEM and XRD, and the corrosion performance was evaluated in electrochemical workstation, thus comparing the difference between the spraying and immerging microarc oxidation, and proved the feasibility of the spraying microarc oxidation. The results show that the coating prepared by spraying and immerging microarc 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 Al, is mainly composed of γ Al2O3, and the electrochemical 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. |
| Key words: aluminum alloy microarc oxidation(MAO) spraying local coating electrochemical |
