铈纳米膜对LY12铝合金表面耐蚀性能的影响  

Effect of Ceria Nanocrystalline Film on Corrosion Resistance of Aluminium Alloy LY12

作　　者：纪红[1] 许越[2] 周德瑞[1] 周育红[1] 

机构地区：[1]哈尔滨工业大学应用化学系,黑龙江哈尔滨150001 [2]北京航空航天大学材料科学与工程学院,北京100083

出　　处：《中国稀土学报》2003年第3期303-306,共4页Journal of the Chinese Society of Rare Earths

基　　金：中国科学院金属腐蚀与防护国家重点实验室开放课题资助项目(1998~2000)

摘　　要：铝合金表面在使用环境中发生的腐蚀破坏限制了它的应用。采用Sol gel提拉法在LY12铝合金表面制备的铈纳米膜具有无毒、无污染和明显的防腐作用。表面分析测试结果表明,膜的主要成分为铈的氧化物;用XRD测试结果估算出膜中铈的粒径为10nm。盐水浸渍法试验结果证明了成膜后LY12铝合金表面的腐蚀速率明显降低;成膜后试样的Tafel曲线腐蚀电势正移;EIS分析结果表明铈纳米膜具有明显的电容特征,该膜阻碍了铝合金表面腐蚀反应的发生;初步提出了铈纳米膜改善LY12铝合金腐蚀性能的机制。Corrosion rupture limites the application of aluminium alloy in practice. A ceria nanocrystalline thin film was obtained on the surface of aluminium alloy LY12 by a dipcoating solgel process. The film was nonpoisonous, nonpolluted and had obvious anticorrosion property. The constituents of the film was studied by Xray photoelectron spectroscopy (XPS), and the results indicate that the film consists of cerium and oxygen. Xray diffraction (XRD) analysis results shows that cluster in the ceria thin film is 10 nm. The data of salt solution immersion test indicate that corrosion rate of aluminium alloy LY12 with ceria thin film is decreased. The corrosion potential is more positive in Tafel curve and the film has capacitance characteristics in EIS measurement. The ceria nanometer thin film restrains corrosion reactions on the surface of aluminium alloy LY12 and the mechanism of corrosion resistance was discussed.

关 键 词：金属材料 铝合金 纳米膜 耐蚀性 稀土 

分 类 号：O614.33[理学—无机化学] TG174.4[理学—化学]