Abstract
Cast Al-Cu-Mg-Mn alloy, prepared by differential pressure casting method, was quenched at 530 °C and aged at 170 °C. The effect of aging time on the corrosion resistance of the Al alloy was investigated in 3.5 wt.% NaCl solution by potentiodynamic polarization and electrochemical impedance spectroscopy tests. The results indicated that the aging time had great influence on the distribution of the Al2Cu phase. A small amount of fine second phase had precipitated along grain boundaries to strengthen the alloy when the aging time was 6 h. Extended aging time led to the rapid growth of the second phase. Pitting corrosion occurred at the interface between the Al2Cu phase and α-Al matrix in 3.5wt.% NaCl solution. The Al2Cu phase with a small size easily fell off to form corrosion pits during the corrosion process, leading to more serious pitting corrosion. However, a network-like Al2Cu phase prevented its falling off, improving pitting corrosion resistance.
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The authors gratefully acknowledge financial support from the Education Department of Yunnan Province Fund, China (grant no. KKPS201951007).
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Luo, B., Lu, K., Zhang, F. et al. Effect of Aging Time on the Corrosion Resistance of the As-cast Al-Cu-Mg-Mn Alloy. JOM 74, 3616–3624 (2022). https://doi.org/10.1007/s11837-022-05399-6
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DOI: https://doi.org/10.1007/s11837-022-05399-6