Abstract

The remelted aluminum scrap exhibits elevated inclusion levels, a condition inadequately addressed by contemporary refining methodologies, particularly with respect to the extraction of diminutive inclusions. The objective of this investigation is to delineate the repercussions of micron-scale inclusions on the corrosion behavior of recycled Al-Zn-Mg-Cu alloy sheets. Aluminum melts, varying in cleanliness, were reprocessed into sheet form and subsequently underwent solution-aging and annealing. Through electrochemical examinations and microstructure characterization, the study assessed the influence of inclusions on the corrosion resistance of the recycled Al-Zn-Mg-Cu alloy within an environment of near-neutral pH containing chlorine. The findings suggest that the presence of inclusions in recycled aluminum predominantly affects corrosion resistance by inducing microdefects in the neighboring matrix and by changing the grain structure. The shift in grain structure is particularly influential on the electrochemical properties of the recycled sheets, with an enhanced effect in the specimens treated with solid solution-aging.

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