Investigation of Ce/Al₂O₃ composite coating on anodised aluminium film by ac deposition method

Abstract

In order to prepare Ce/Al₂O₃ composite coating on oxide film quickly, a new process of ac deposition method in a solution containing H₂O₂ and CeCl₃ was introduced. Scanning electron microscopy/energy dispersive X-ray spectroscopy, electron probe microanalyser, X-ray diffractometer and X-ray photoelectron spectroscopy were adopted to analyse the coating. The results showed that the Ce/Al₂O₃ composite coating was easy to prepare when the Al₂O₃ film thickness was over 6·8 μm. The Ce sediment was amorphous of cerium (III and IV) hydroxide and located into the pores near the surface of Al₂O₃ films layer. The forming mechanism of the composite coating was discussed accordingly.

Keywords:

• ALUMINIUM ALLOY
• AL2O3 FILM
• CE/AL2O3 COMPOSITE COATING
• AC DEPOSITION METHOD