| 7B04铝合金的一种阳极化膜层电化学性能研究 |
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| 引用本文： | 孙志华,章妮,蔡健平,刘明,陆峰,陶春虎.7B04铝合金的一种阳极化膜层电化学性能研究[J].腐蚀科学与防护技术,2009,21(3). |
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| 作者姓名： | 孙志华 章妮 蔡健平 刘明 陆峰 陶春虎 |
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| 作者单位： | 1. 北京航空材料研究院金属腐蚀与防护研究室,北京,100095
2. 北京航空航天大学材料科学与工程系,北京,100083 |
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| 基金项目： | 武器装备预研基金，国防科技工业技术基础项目，航空基础科学基金 |
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| 摘 要： | 采用电化学交流阻抗技术(EIS)对7B04铝合金的一种阳极化膜层在加速老化试验过程中的阻抗变化进行了原位测试,分析了其腐蚀失效的特征.结果表明,随加速试验的进行,硫酸阳极化膜层的失光率和色差变化较小,属不失光或很轻微失光和不变色;腐蚀前,阳极化膜的多孔层常相位元件的幂指数n相对较小,仅0.61,说明多孔层孔洞分布比较不均匀.随试验时间增加,n值逐渐增大并接近1,多孔电阻Rpo也逐渐增加,且后期增加幅度加大,这是由于沉淀物的部分封堵与耐蚀钝化膜的共同作用;阳极化膜划痕处的局部交流阻抗随试验时间增加不断减小,是由于划痕处金属发生了腐蚀反应所致,划痕处的阻抗增大则是由于划痕处被腐蚀产物覆盖所致.
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| 关 键 词： | 7B04铝合金 阳极化膜层 加速老化试验 电化学阻抗变化 |
ELECTROCHEMICAL BEHAVIOR OF AN ANODIC OXIDATION FILM ON ALUMINUM ALLOY 7B04 |
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| SUN Zhi-hua,ZHANG Ni,CAI Jian-ping,LIU Ming,LU Feng,TAO Chun-hu.ELECTROCHEMICAL BEHAVIOR OF AN ANODIC OXIDATION FILM ON ALUMINUM ALLOY 7B04[J].Corrosion Science and Protection Technology,2009,21(3). |
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| Authors: | SUN Zhi-hua ZHANG Ni CAI Jian-ping LIU Ming LU Feng TAO Chun-hu |
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| Affiliation: | SUN Zhi-hua1,ZHANG Ni2,CAI Jian-ping1,LIU Ming1,LU Feng1,TAO Chun-hu11.Lab of Metal Corrosion , Protection,Beijing Institute of Aeronatical Materials,Beijing 100095,2.Department of Material Science , Engineering,Beihang University,Beijing 100083 |
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| Abstract: | The variation of electrochemical impedance of an anodic oxidation film on aeronautical aluminum alloy 7B04 during accelerated degradation test was studied using electrochemical impedance spectroscopy(EIS).It has been found that the gloss and the color difference of sulfuric acid anodic oxidation film had little change during the test.n in CPE of porous layer was very small and was about 0.61.But with the prolonged of corrosion time,n increased gradually and reached to 1,also the resistance Rpo of the porous... |
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| Keywords: | aluminum anodic oxidation film accelerated degradation test EIS failure characteristic |
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