Study on the anodizing process of 2219 aluminum alloy with tartaric acid and sulfuric acid
The 2219 aluminum alloy commonly used in aerospace field was is taken as the research object.The effects of tartaric acid concentration,sulfuric acid concentration,oxidation temperature,oxidation time and oxidation voltage on the morphology,thickness and corrosion resistance of tartaric acid-sulfuric acid anodic oxidation film were studied by single factor and orthogonal experiments.The effects of hot water sealing time on corrosion resistance of the film were also studied.The results showed that when the concentration of sulfuric acid was 50 g/L,the concentration of tartaric acid was 80 g/L,the oxidation voltage was 16 V,the oxidation temperature was 35℃,and the oxidation time was 28 min,the oxidation film had the best corrosion resistance.The corrosion resistance of the anodic oxide film first increased and then decreased with the increase of hot water sealing time.When the hot water sealing time was 40 min,its corrosion resistance was the best.After 336 h neutral salt spray experiment,no corrosion spots were generated.
2219 aluminum alloytartaric-sulfuric acid electrolyteanodic oxidationelectrochemical impedance spectroscopyhot water sealing
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