铈、锂盐对铝阳极氧化膜的协同封闭作用

研究了铈、锂盐在铝阳极氧化膜封闭处理中的协同作用.场发射扫描电镜和X射线衍射谱对铈、锂盐协同封闭前后铝阳极氧化膜形貌和结构的研究结果表明，封闭后膜表面的孔洞消失，封闭产物分布均匀，封闭后膜仍然以非晶态形式存在.根据X射线光电子能谱的结果，封闭后的膜主要由含结晶水的Al2O3及铈、锂的混合氢氧化物组成，同时膜中还含有及封闭溶液组分中的一些阴离子.电化学阻抗谱的研究结果表明铈、锂盐协同封闭能够显著提高膜的耐蚀性能.在实验结果基础上，初步认为铈、锂盐封闭是通过生成结构紧密的封闭产物填充、覆盖膜孔，从而显著提高铝阳极氧化膜的耐蚀性能.

Investigations of the Synergism between Cerium Salt and Lithium Salt in the Sealing of Anodized Film of Aluminum

The synergism between cerium salt and lithium salt in the sealing of anodized film of aluminum has been investigated by using electrochemical impedance spectroscopy (EIS),scanning electron microscopy with a field emission gun as electron source(FEG SEM), X ray diffraction(XRD) and X ray photoelectron spectroscopy(XPS). It was revealed that the pores of anodized film of aluminum were covered with the sealing products and the corrosion resistance of the film was improved evidently by sealing process. The sealed films exhibited amorphous nature and mainly consisted of hydrous aluminum oxide and hydroxides of cerium and lithium. Some and anions of sealing solutions also existed in the films. Based on the experimental results, it could be inferred that the cerium and lithium species in the sealing solution have some kind of synergism, which can make the sealing products more compact and effectively improve the corrosion resistance of the film.