1 XCMG Construction Machinery Co., Ltd., Xuzhou 221000, Jiangsu, China 2 College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China
Abstract: In order to improve the corrosion resistance of aluminum alloy, a barrier coating was prepared by combining anodizing process with sol-gel deposition coating to replace the environment-polluting chromate conversion coating. The passivation film on the surface of aluminum alloy was constructed by anodizing method, and then the porous structure of the anodizing layer was infiltrated by Ce-based sol, and then the hole was calcined to seal the hole. The effect of anodic oxidation temperature on the surface morphology and corrosion resistance of the oxide film was studied, and the optimal anodic oxidation temperature was determined to be 15 ℃. The effects of different aging times of Ce-based sol on the surface morphology, thickness, corrosion resistance and self-healing properties of CeO2/anodized composite film were further explored. It was found that when the Ce-based sol aging time was 5 h, the surface of the CeO2/anodized composite film was smooth and compact, and the thickness of the film was 26.20 μm. The Ce atoms were evenly distributed on the surface of the film, and the corrosion potential was 0.021 V, indicating that the film had good corrosion resistance. Electrochemical impedance spectroscopy showed that the membrane had short-term self-healing properties in 3.5wt% NaCl solution. This method provides a new way to obtain protective film on the surface of 6061 aluminum alloy, and opens up a new prospect for replacing chromate coating.
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2023, Vol. 37 
