Abstract
A new cerium salt sealing method for anodic film on aluminium alloy using pulse electric field was introduced in this paper, and the corrosion behaviours of the sealed aluminium were comparatively studied in neutral, acidic and alkaline NaCl solutions by means of polarisation curve and electrochemical impedance spectroscopy measurements. The results show that the corrosion resistance of anodic film sealed with the method is better than that sealed with boiling water and potassium dichromate. The sealing mechanism of Ce salt under bidirectional pulse electric field was also proposed. Owing to its low energy consumption and low toxicity, this method could be an alternative to potassium dichromate or boiling water sealing.
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