Effect of Grain Size on Corrosion Behavior of 7075 Aluminum Alloy

ZHANG Jianwen; HUANG Julin; HUANG Yuhui; ZOU Xiangdan; ZHAO Hao; SHAO Guohua

doi:10.7643/ issn.1672-9242.2025.10.015

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (10) : 123-131. DOI: 10.7643/ issn.1672-9242.2025.10.015

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Effect of Grain Size on Corrosion Behavior of 7075 Aluminum Alloy

ZHANG Jianwen¹, HUANG Julin¹, HUANG Yuhui¹, ZOU Xiangdan², ZHAO Hao², SHAO Guohua^{3, *}

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Abstract

The work aims to systematically study the influence mechanism of grain size on its corrosion behavior. Three different grain sizes of 7075 aluminum alloy samples were prepared using discharge plasma sintering technology, Through potentiodynamic polarization curves, electrochemical impedance spectroscopy, and micro area electrochemical scanning techniques, combined with first-principles calculations, the correlation between grain size and alloy corrosion sensitivity was analyzed. The S3 sample with the smallest grain size exhibited the lowest corrosion potential (-0.79 V), the maximum corrosion current density (1.1×10^-5 A/cm²), and the maximum intergranular corrosion depth, with the worst corrosion resistance. The copper containing precipitates enriched at grain boundaries served as cathode active sites, inducing anodic dissolution by accelerating oxygen reduction reactions. In addition, under the same average size, S2 samples with uniform grain distribution had better corrosion resistance than dispersed S1 samples. In conclusion, grain size uniformity is a key factor affecting the corrosion resistance of alloys, providing a basis for optimizing the grain design of high-strength aluminum alloys.

Key words

7075 aluminum alloy / grain size / electrochemical corrosion / corrosion resistance / intergranular corrosion / first-principles

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ZHANG Jianwen, HUANG Julin, HUANG Yuhui, ZOU Xiangdan, ZHAO Hao, SHAO Guohua. Effect of Grain Size on Corrosion Behavior of 7075 Aluminum Alloy[J]. Equipment Environmental Engineering. 2025, 22(10): 123-131 https://doi.org/10.7643/ issn.1672-9242.2025.10.015

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