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<p>The single-stage aging (T6) and double-stage aging (T73 and T74) were conducted on the Al-Zn-Mg-Cu alloy obtained from backward extrusion. The precipitation behavior during the aging process and its effects on the corrosion resistance were comprehensively examined. The results indicate that the double-stage aging can greatly enhance the corrosion resistance compared to the single-stage aging. The grain boundary precipitates after T6 treatment are mainly composed of fine η′ phases with continuous distribution, and the width of the precipitation-free zone is narrow, resulting in the lowest corrosion resistance. The grain boundary precipitates after T74 are primarily composed of large, blocky, plate-like η phases that exhibit a dispersed distribution, and the width of the precipitation-free zone is large. Hence, the corrosion resistance of the T74 treated sample is superior, compared to those of T6 and T73. Moreover, double-stage aging can promote the segregation of Cu element at grain boundaries, thereby decreasing the anodic dissolution rate and effectively inhibiting the stress corrosion cracking.</p>

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Effects of Aging Treatment on Precipitation Behavior and Corrosion Resistance of High-Strength Al-Zn-Mg-Cu Alloy

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Long Li,
  • Xuejian Bai,
  • Liang Chen,
  • Guangyao Guo,
  • Minghao Sun,
  • Wenfei Cheng,
  • Zhiwei Han,
  • Zhipeng Lin,
  • Dehong Wang

摘要

The single-stage aging (T6) and double-stage aging (T73 and T74) were conducted on the Al-Zn-Mg-Cu alloy obtained from backward extrusion. The precipitation behavior during the aging process and its effects on the corrosion resistance were comprehensively examined. The results indicate that the double-stage aging can greatly enhance the corrosion resistance compared to the single-stage aging. The grain boundary precipitates after T6 treatment are mainly composed of fine η′ phases with continuous distribution, and the width of the precipitation-free zone is narrow, resulting in the lowest corrosion resistance. The grain boundary precipitates after T74 are primarily composed of large, blocky, plate-like η phases that exhibit a dispersed distribution, and the width of the precipitation-free zone is large. Hence, the corrosion resistance of the T74 treated sample is superior, compared to those of T6 and T73. Moreover, double-stage aging can promote the segregation of Cu element at grain boundaries, thereby decreasing the anodic dissolution rate and effectively inhibiting the stress corrosion cracking.