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中国腐蚀与防护学报  2013, Vol. 33 Issue (6): 475-480    
  研究论文 本期目录 | 过刊浏览 |
阴极电流密度对LY12铝合金微弧氧化膜致密性的影响
王 勇1 田 颖2 郭泉忠1 郭兴华1 杜克勤1 王福会1
1. 中国科学院金属研究所 金属腐蚀与防护国家重点实验室 沈阳 110016;
2. 大连交通大学环境与化学工程学院 大连 116021
Effect of Cathodic Current Density on Compactness of Micro Arc Oxidation Film on LY12 Al Alloy
WANG Yong1, TIAN Ying2, GUO Quanzhong1, GUO Xinghua1, DU Keqin1, WANG Fuhui1
1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116021, China
全文: PDF(2894 KB)  
摘要: 采用双极性脉冲电源,在一定的阳极电流密度 (ja) 下,通过改变制备过程中阴极电流密度 (jc) 的大小,在LY12铝合金表面制备微弧氧化膜。采用SEM,EIS和中性盐雾实验研究微弧氧化膜的表面微观形貌、致密性以及实际服役性能的变化,进而分析jc对LY12铝合金微弧氧化膜致密性的影响。结果表明:施加适当的jc可以制备致密性较好的氧化膜;当jc较低或较高时,微等离子体在基体表面放电火花分布不均,无法获得致密性氧化膜;当ja=5 A/dm2jajc=1∶1时,获得的LY12铝合金微弧氧化膜的致密性最佳。
关键词 铝合金微弧氧化阴极电流密度电化学阻抗谱致密性    
Abstract:A micro arc oxidation (MAO) ceramic film on LY12 Al alloy was prepared by using bipolar pulsed power supply with changing cathodic current density (jc) while keeping a constant anodic current density (ja). The morphology, barrier property and practical service performance of the film were studied by scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS) and neutral salt spray test. Then, the effect of jc on the film compactness was analyzed. Experimental results showed that the jc value was a key factor responsible to the film compactness. The film prepared by an appropriate jc value exhibited a good compactness, however, by a value above or below which the compactness of the films became worse due to that the electro-sparks ununiformly distributed throughout the Al alloy surface. When ja=5 A/dm2 and jajc=1∶1, the MAO film on LY12 alloy showed the best compactness and protection performance.
Key wordsaluminum alloy    micro arc oxidation    cathodic current density    electrochemical
impedance spectrum
   compactness
收稿日期: 2013-03-25     
ZTFLH:  TG174.4  
基金资助:十二五国家科技支撑计划项目 (2011BAE22B05-4) 和国防基础科研项目 (A0920110028) 资助
通讯作者: 杜克勤,E-mail:kqdu@imr.ac.cn   
作者简介: 王勇,男,1986年生,研究方向为金属的表面处理

引用本文:

王勇, 田颖, 郭泉忠, 郭兴华, 杜克勤, 王福会. 阴极电流密度对LY12铝合金微弧氧化膜致密性的影响[J]. 中国腐蚀与防护学报, 2013, 33(6): 475-480.
WANG Yong, TIAN Ying, GUO Quanzhong, GUO Xinghua, DU Keqin, WANG Fuhui. Effect of Cathodic Current Density on Compactness of Micro Arc Oxidation Film on LY12 Al Alloy. Journal of Chinese Society for Corrosion and protection, 2013, 33(6): 475-480.

链接本文:

https://www.jcscp.org/CN/      或      https://www.jcscp.org/CN/Y2013/V33/I6/475

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