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<p>The improved corrosion resistance of an Al-5.61Zn-1.87&#xa0;Mg–0.29Cu–0.32Mn–0.09Sc–0.09Zr alloy in corrosive solutions by dual-stage aging is systematically investigated. Pitting corrosion, stress corrosion cracking (SCC), and electrochemical tests are conducted to appraise the corrosion resistance in neutral (S1), weakly acidic (S2), and weakly alkaline (S3) circumstances. The order of pitting resistance (S1 &lt; S2 &lt; S3) and SCC resistance (S2 &lt; S1 &lt; S3) of the alloy was revealed. The underlying pitting and SCC mechanisms were further uncovered. Corrosion processes are affected by dynamic damage and dynamic repair of the passive film on the alloy’s surface. Particularly, the alloy in S2 solution can form different corrosion products which are more stable and hinder the corrosion process, resulting in better corrosion resistance of the alloy in S2 solution than in S1 solution. However, these corrosion products cannot deform with the matrix and are ruptured during SCC. Subsequently, high concentration of H<sup>+</sup> will accelerate anodic dissolution and hydrogen-induced cracking. Compared to the single-stage aging, dual-stage aging can effectively narrow the potential difference between the Al matrix and η' phases/second phases. The density of η' can also be reduced, which increases the difficulty of anodic dissolution. Additionally, hydrogen-induced cracking can be reduced by coarsened grain boundary precipitates and fewer local high-angle grain boundaries after dual-stage aging.</p>

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Effect of dual-stage aging and aggressive circumstances on corrosion resistance and mechanism of Al–Zn–Mg–Cu alloy

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Guofu Xu,
  • Mengjiao Liu,
  • Xiaoyan Peng,
  • Zhihao Zhao,
  • Jiwu Huang,
  • Lei Tang

摘要

The improved corrosion resistance of an Al-5.61Zn-1.87 Mg–0.29Cu–0.32Mn–0.09Sc–0.09Zr alloy in corrosive solutions by dual-stage aging is systematically investigated. Pitting corrosion, stress corrosion cracking (SCC), and electrochemical tests are conducted to appraise the corrosion resistance in neutral (S1), weakly acidic (S2), and weakly alkaline (S3) circumstances. The order of pitting resistance (S1 < S2 < S3) and SCC resistance (S2 < S1 < S3) of the alloy was revealed. The underlying pitting and SCC mechanisms were further uncovered. Corrosion processes are affected by dynamic damage and dynamic repair of the passive film on the alloy’s surface. Particularly, the alloy in S2 solution can form different corrosion products which are more stable and hinder the corrosion process, resulting in better corrosion resistance of the alloy in S2 solution than in S1 solution. However, these corrosion products cannot deform with the matrix and are ruptured during SCC. Subsequently, high concentration of H+ will accelerate anodic dissolution and hydrogen-induced cracking. Compared to the single-stage aging, dual-stage aging can effectively narrow the potential difference between the Al matrix and η' phases/second phases. The density of η' can also be reduced, which increases the difficulty of anodic dissolution. Additionally, hydrogen-induced cracking can be reduced by coarsened grain boundary precipitates and fewer local high-angle grain boundaries after dual-stage aging.