Effect of second phase in 2024-T3 aluminum alloy on microstructure and corrosion resistance of its anodic oxidation film
[Introduction]The existence of second phases in 2024-T3 aluminum alloy affects the growth of anodic oxidation film,which in turn affects the microstructure and corrosion resistance of the anodic oxidation film.[Method]2024-T3 aluminum alloy was anodized in an environmentally friendly bath mainly consisting of malic acid and sulfuric acid.The effect of second phase in substrate on the microstructure and corrosion resistance of anodic oxidation film was studied through neutral salt spray test,in combination with micromorphology observation and elemental composition analysis at different areas of anodic oxidation film before and after being corroded.The corrosion failure mechanism of anodic oxidation film was also discussed.[Result]The anodic oxidation film formed at the position with second phase had poor compactness with micropores and peeling phenomenon,which are the main causes of pitting corrosion.[Conclusion]The findings of this paper can provide a theoretical basis and experimental data support for the improvement of aluminum alloy anodization in aerospace field.
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