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粉末冶金材料科学与工程  2018, Vol. 23 Issue (5): 503-510    
  工艺技术 本期目录 | 过刊浏览 | 高级检索 |
氧化时间对铝合金微弧氧化膜层结构及耐腐蚀性能的影响
方雷, 马运柱, 刘文胜, 刘阳, 刘超, 颜焕元
中南大学 粉末冶金国家重点实验室,长沙 410083
Effects of oxidation time on microstructure and corrosion resistance of micro-arc oxidation film on aluminum alloy
FANG Lei, MA Yunzhu, LIU Wensheng, LIU Yang, LIU Chao, YAN Huanyuan
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083
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摘要 在硅酸盐体系(Na2SiO3+KOH)电解液中,采用微弧氧化技术在5052铝合金表面原位生成微弧氧化膜层。并利用SEM、EDS和XRD等仪器设备,分析微弧氧化膜层形貌、元素分布和相组成,着重分析氧化时间对膜层厚度、表面孔隙率和最大孔洞直径及膜层耐腐蚀性的影响。结果表明:微弧氧化膜层表面有典型的“火山堆积”形貌生成,且膜层厚度、表面孔隙率和最大孔洞直径随氧化时间的增加而增大;膜层主要元素为O和Al,相组成为γ-Al2O3和α-Al2O3,且主要为γ-Al2O3;微弧氧化处理可显著提高试样的耐腐蚀性能,腐蚀电流密度至少下降2个数量级,电化学阻抗模值|Z|至少增加2个数量级,随氧化时间从10 min延长到50 min试样的耐腐蚀性能先提升后降低,氧化时间为20 min的试样耐腐蚀性能最好。
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方雷
马运柱
刘文胜
刘阳
刘超
颜焕元
关键词 5052铝合金微弧氧化氧化膜膜层结构耐腐蚀性    
Abstract:Micro-arc oxidation (MAO) films were fabricated on 5052 aluminum alloy by micro-arc oxidation in silicate system (Na2SiO3+KOH) solution. The morphology, elemental distribution and phase composition of MAO films were analyzed by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD).The effects of oxidation time on the film thickness, surface porosity, the maximum hole diameter and the corrosion resistance of the film were analyzed emphatically. The results show that the surface of the micro-arc oxidation film has “volcano deposit” morphology, and the film thickness, surface porosity and pore diameter increase with increasing oxidation time. The film mainly with O and Al elements, is composed of γ-Al2O3 and α-Al2O3 phases, in which the content of γ-Al2O3 phase is higher. The corrosion resistance of MAO treated sample is obviously improved, the corrosion current density is decreased by at least two order of degree magnitude, and the electrochemical impedance modulus |Z| is increased at least two order of degree magnitude. With the oxidation time increasing from 10 min to 50 min, the corrosion resistance of the sample first increases and then decreases. When the oxidation time is 20 min, the sample shows the best corrosion resistance.
Key words5052 aluminum alloy    micro-arc oxidation    oxidation film    film structure    corrosion resistance
收稿日期: 2018-03-25      出版日期: 2019-07-12
ZTFLH:  TG178  
基金资助:国家重点基础研究发展规划资助项目(61xxxx02)
通讯作者: 马运柱,教授,博士。电话:0731-88877825;E-mail: zhuzipm@csu.edu.cn   
引用本文:   
方雷, 马运柱, 刘文胜, 刘阳, 刘超, 颜焕元. 氧化时间对铝合金微弧氧化膜层结构及耐腐蚀性能的影响[J]. 粉末冶金材料科学与工程, 2018, 23(5): 503-510.
FANG Lei, MA Yunzhu, LIU Wensheng, LIU Yang, LIU Chao, YAN Huanyuan. Effects of oxidation time on microstructure and corrosion resistance of micro-arc oxidation film on aluminum alloy. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 503-510.
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