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 dipcoating solgel process. The film was nonpoisonous, nonpolluted and had obvious anticorrosion property. The constituents of the film was studied by Xray photoelectron spectroscopy (XPS), and the results indicate that the film consists of cerium and oxygen. Xray 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.
出处
《中国稀土学报》
CAS
CSCD
北大核心
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)
关键词
金属材料
铝合金
纳米膜
耐蚀性
稀土
metal materials
aluminium alloy
nanocrystalline thin film
corrosion resistance
rare earths
