A novel CVD Method for Rapid Fabrication of Superhydrophobic Surface on Aluminum Alloy Coated Nanostructured Cerium-Oxide and Its Corrosion Resistance

摘要

An facile CVD method of fabricating a superhydrophobic coating on aluminum alloy was reported inthis paper. The rough surface structure could be easily obtained by hydrothermal deposition of ceriumoxide. The rough surface could be changed from superhydrophilic to superhydrophobic bymodification with 1H,1H,2H,2H-perfluorooctyltriethoxysilane. The as-prepared coatings werecharacterized by scanning electron microscopy (SEM), contact angle measurement, and Fouriertransform infrared spectroscopy. The influence of boiling water treatment on the microano-structureof cerium-oxide film was elucidated by SEM. The anticorrosion property of the superhydrophobiccerium-oxide film on aluminum alloy in 3.5 wt. % NaCl aqueous solution was investigated using linearpolarization, open-circuit potential curve, and electrochemical impedance spectroscopy analyses. Theeffect of transformation between the Wenzel and Cassieaxter states on corrosion resistance wasstudied. Results showed that superhydrophobic film in Cassie揃axter state had a better protection.Electrochemical results revealed that the superhydrophobic cerium-oxide film significantly improvedthe corrosion resistance of aluminum alloy, and the stable air cushion formed on the superhydrophobicsurface was essential to the improvement of the anticorrosion property.