This work studies the oxide film structure on the surface of cylindrical ingots made of 6000 series aluminum alloy after homogenization annealing and tests with alternating immersion in an electrolyte based on sodium chloride using electron microscopy and energy dispersive analysis. Results reveal a 40–200% increase in weight loss in areas covered with white bloom when the active environment impacts the ingot surface due to the presence of defects in the oxide film structure. In addition, the corrosion rate increases by a factor of 2–3 compared to the clean zones, while passivation processes are not noted on both parts of the surface. Defects in the structure of the oxide film are associated with the partial reduction of aluminum oxide during diffusion annealing at the site of contact with organic contaminants.
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Translated from Metallurg, Vol. 65, No. 5, pp. 40–44, May, 2021. Russian DOI: 10.52351/00260827_2021_05_52.
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Pronichev, D.V., Gurevich, L.M., Slautin, O.V. et al. Influence of the Surface Condition of Cylindrical Aluminum Alloy Ingots of Series 6000 on Corrosion Resistance. Metallurgist 65, 538–548 (2021). https://doi.org/10.1007/s11015-021-01188-9
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DOI: https://doi.org/10.1007/s11015-021-01188-9