摘要
采用扫描式微弧氧化(SMAO)技术在A356铝合金表面制备了陶瓷涂层。测定了反应过程中涂层的电压-时间、动力学生长曲线,研究了涂层的显微组织、成分分布,分析涂层的相组成及显微硬度分布,并比较了氧化前后极化曲线的变化。结果表明,在硅酸盐溶液中获得的涂层主要由α-Al_2O_3、γ-Al_2O_3和莫来石组成,涂层与基体呈现良好的冶金结合。与A356传统式微弧氧化(CMAO)涂层相比,SMAO涂层中α-Al_2O_3含量略多、孔隙率更低,显微硬度更高。此外,两种氧化处理之后,铝合金的耐腐蚀能力均得到显著提高。
Al-alloy A356 was treated by scanning micro arc oxidation （SMAO） method. The voltage- time and coating thickness-time curves were recorded. The microstructure, composition, phase constitu- ent and microhardness profile of coatings werecharacterized. The corrosion behavior of the composite was evaluated by polarization test. Results show that the coating deposited in silicate electrolyte consists of α-Al2O3, γ-Al2O3 and mullite. The coating and the substrate presented excellent metallurgical bonding. Compared with the common micro arc oxidation （CMAO） coatings on A356 alloy, the SMAO coating con- tained higher amount of α-Al2O3 phase withless porous, and possessed higher micro hardness. However, af- ter treatment by either CMAO or SMAO, the corrosion resistance of A356 alloy was significantly improved. KEY WORDS materials failure and protection, Al-alloy, scanning micro arc oxidation, ceramic coating, corrosion resistance
作者
夏伶勤
韩建民
杨莎
杨智勇
李卫京
XIA Lingqin HAN Jianmin YANG Sha YANG Zhiyong LI Weijing(School of Mechanical Electric and Control Engineering, Beijing Jiaotong University, Beijing 100044, China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2016年第12期914-920,共7页
Chinese Journal of Materials Research
基金
国家自然科学基金51371022
中央高校基本科研业务费专项资金2015JBM076
中国铁路总公司科技研究开发计划课题2015008-C资助项目~~
关键词
材料失效与防护
铝合金
扫描式微弧氧化
陶瓷膜
腐蚀性能
materials failure and protection, AI-alloy, scanning micro arc oxidation, ceramic coating,corrosion resistance
