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<p>Alloying plays a pivotal role in regulating critical factors associated with corrosion behavior, including grain size, precipitates, and the precipitation-free zone (PFZ). This study delved into the synergistic effects of Mg and Sc on the corrosion behaviors of Al-Cu-Mn alloy, focusing on intergranular corrosion (IGC) and pitting corrosion. Based on multi-scale and dimensional quantitative characterization of microstructure, the mechanism underlying the influence of Mg and Sc was explored. The results show that adding Mg and Sc decreases the corrosion current density from 17.33 to 1.37 μA/cm<sup>2</sup> and lowers the corrosion rate from 0.183 to 0.014&#xa0;mm/y, while increasing the corrosion potential from  − 1.036 to  − 0.796&#xa0;V. The addition of Mg and Sc refines the average grain size from 293.17 to 222.36&#xa0;μm, and increases the passive film thickness from 1.512 to 3.000&#xa0;nm. In addition, the addition of Mg and Sc leads to the refinement of θ’-Al<sub>2</sub>Cu and the formation of S’-Al<sub>2</sub>CuMg. Therefore, although the addition of Mg and Sc leads to the formation of PFZ, the synergistic regulation of grain size, passive film, and precipitates significantly mitigates the expansion of IGC and pitting corrosion of Al-Cu-Mn alloy.</p>

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Synergistic Factors Affecting the Corrosion Behavior of Al-Cu-Mn Cast Alloy Based on the Addition of Mg and Sc

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Mengyao Zhang,
  • Chen Chen,
  • Runze Zhang,
  • Yaqiang Tian,
  • Mingshan Zhang,
  • Xiaoping Zheng,
  • Liansheng Chen

摘要

Alloying plays a pivotal role in regulating critical factors associated with corrosion behavior, including grain size, precipitates, and the precipitation-free zone (PFZ). This study delved into the synergistic effects of Mg and Sc on the corrosion behaviors of Al-Cu-Mn alloy, focusing on intergranular corrosion (IGC) and pitting corrosion. Based on multi-scale and dimensional quantitative characterization of microstructure, the mechanism underlying the influence of Mg and Sc was explored. The results show that adding Mg and Sc decreases the corrosion current density from 17.33 to 1.37 μA/cm2 and lowers the corrosion rate from 0.183 to 0.014 mm/y, while increasing the corrosion potential from  − 1.036 to  − 0.796 V. The addition of Mg and Sc refines the average grain size from 293.17 to 222.36 μm, and increases the passive film thickness from 1.512 to 3.000 nm. In addition, the addition of Mg and Sc leads to the refinement of θ’-Al2Cu and the formation of S’-Al2CuMg. Therefore, although the addition of Mg and Sc leads to the formation of PFZ, the synergistic regulation of grain size, passive film, and precipitates significantly mitigates the expansion of IGC and pitting corrosion of Al-Cu-Mn alloy.