Abstract: Compared with traditional aluminum alloys, the novel aluminum-lithium (Al-Li) alloys are widely used in the aerospace industry, to improve the payload and fuel efficiency of the aircraft, due to their low density, high specific strength and specific stiffness. However, the Al-Li alloys are prone to corrosion in humid environments. In industry, the corrosion resistance of aluminum alloys is usually improved through anodizing treatments. This work studied the effect of tartaric acid content on the structure and corrosion resistance of the anodic oxidation film, by adding 0 mol/L, 0.1 mol/L, 0.3 mol/L, 0.53 mol/L, 0.7 mol/L, and 0.9 mol/L tartaric acid into sulfuric acid solution. The corrosion resistance of the anodic films was investigated through electrochemical impedance spectroscopy (EIS) and neural salt spray test (NSST). The results show that tartaric acid did not change the formation mechanism of anodic oxide film, but reduced the dissolution rate of the film. The growth rate and thickness of anodic oxide film increased firstly and then decreased with the increase of tartaric acid concentration, and reached the maximum value when the amount of tartaric acid was 0.3 mol/L. Tartaric acid can reduce the capacitance of the oxide film barrier layer, increase the resistance of the barrier layer, and make it difficult for the aggressive ions to pass through the oxide film. However, no obvious correlation between the corrosion resistance of TSA film and the amount of tartaric acid has been found.
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2022, Vol. 36 
