Corrosion behavior of a vacuum die-cast aluminum alloy strengthened by cryogenic-solution-aging treatment

doi:10.13251/j.issn.0254-6051.2025.01.019

Abstract

Abstract: Effect of cryogenic-solution-aging treatment on microstructure and mechanical properties of a vacuum die-cast aluminium alloy and its corrosion behavior after immersion in 3.5%NaCl solution for different time were studied. The results show that the cryogenic-solution-aging treatment can effectively improve the mechanical properties of the vacuum die-cast alloy, and the tensile strength is increased from 184.8 MPa to 249.5 MPa, the hardness is increased from 90.3 HV0.1 to 124.6 HV0.1, and the elongation is increased from 6.3% to 7.7%. The cryogenic-solution-aging treatment promotes the α-Al phase, Si phase and Al₅FeSi phase in the aluminum alloy to become fine and distribute evenly, which is conducive to the formation of a denser and more uniform passivation layer during immersion, indirectly hindering the invasion of chloride ions into the internal structure of the aluminum alloy. Compared with the as-cast aluminum alloy, the corrosion progress of cryogenic-solution-aging treated alloy is slow, and the corrosion resistance is significantly improved.

Key words: vacuum die-casting aluminum alloy, cryogenic-solution-aging treatment, corrosion resistance, immersion time

CLC Number:

TG146.2

Li Zhiqiang, Liu Guanglei, Ding Ran, Xu Fuhai, Tao Cheng, Liu Haixia, Cheng Xiaonong. Corrosion behavior of a vacuum die-cast aluminum alloy strengthened by cryogenic-solution-aging treatment[J]. Heat Treatment of Metals, 2025, 50(1): 126-132.

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