| 微弧氧化-溶胶凝胶复合表面技术改善铝合金的耐腐蚀性能 |
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| 引用本文： | 但敏,童洪辉,沈丽如,金凡亚,李炯. 微弧氧化-溶胶凝胶复合表面技术改善铝合金的耐腐蚀性能[J]. 材料热处理学报, 2011, 32(8) |
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| 作者姓名： | 但敏 童洪辉 沈丽如 金凡亚 李炯 |
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| 作者单位： | 核工业西南物理研究院,四川成都,610041 |
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| 基金项目： | 国家自然科学基金项目(10875038) |
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| 摘 要： | 通过微弧氧化-溶胶凝胶复合表面处理技术来提高铝合金的耐腐蚀性能,分析了多层凝胶层对6061铝合金耐腐蚀性能的影响。采用扫描电镜（SEM）、X射线衍射仪（XRD）和电化学分析等方法对膜层的表面形貌、化学组成、结构以及耐腐蚀性能进行了表征。研究表明：TiO2溶胶渗入微弧氧化陶瓷膜的微孔以及裂纹中,能有效阻挡腐蚀介质的扩散和渗透;复合处理后的试样较仅微弧氧化处理更平滑、致密;膜层除了γ-Al2O3相外,经高温退火处理后出现TiO2锐钛矿,并形成较好的晶相结构;在3.5%NaCl溶液中的室温电化学行为中,复合处理较微弧氧化处理后的试样自腐蚀电位上升最高约400 mV,自腐蚀电流密度最高减小约3个数量级,极化电阻明显增大;随着凝胶层厚度的增加耐腐蚀性能逐渐增强,但当凝胶层数大于4时,膜层龟裂现象严重,并导致耐腐蚀性能开始下滑。
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| 关 键 词： | 6061铝合金 微弧氧化 陶瓷层 溶胶凝胶 耐腐蚀 |
Enhancement of corrosion resistance of aluminum alloy through compound surface treatment of micro-arc oxidation and sol-gel |
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| DAN Min,TONG Hong-hui,SHEN Li-ru,JIN Fan-ya,LI Jiong. Enhancement of corrosion resistance of aluminum alloy through compound surface treatment of micro-arc oxidation and sol-gel[J]. Transactions of Materials and Heat Treatment, 2011, 32(8) |
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| Authors: | DAN Min TONG Hong-hui SHEN Li-ru JIN Fan-ya LI Jiong |
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| Affiliation: | DAN Min,TONG Hong-hui,SHEN Li-ru,JIN Fan-ya,LI Jiong(Southwestern Institute of Physics,Chengdu 610041,China) |
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| Abstract: | The compound surface treatment of micro-arc oxidation(MAO) and sol-gel with different layers was used to enhance the corrosion resistance of 6061 aluminum alloy.The microstructure,composition,phases and corrosion resistance of the coatings were investigated by means of SEM,XRD and electrochemical tests.The results show that TiO2 particles infiltrate into the pores and cracks of MAO ceramic coating after sol-gel treatment,which can block the corrosive media out of the coating.The coatings treated by the comp... |
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| Keywords: | 6061aluminum alloy micro-arc oxidation(MAO) ceramic membrane Sol-Gel corrosion resistance |
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