ABSTRACT Micro-alloying is thought to improve the performance of Al–Mg alloys commonly used in transport applications. The effect of Ce addition (not higher than 0.9 wt-%) on the microstructure, corrosion behavior, and mechanical properties of the Al–9.2Mg–0.7Mn alloy was systematically investigated to assess its potential use in engineering applications. Ce addition had a significant effect on pitting corrosion resistance due to its segregation in the Mn-rich phase. In particular, the pitting corrosion rate of the alloy in the sensitization state decreased substantially with Ce addition, and was approximately 48 and 53% lower than that of the alloy matrix with 0.1 and 0.3 wt.% Ce, respectively. In addition, its strength was improved through 0.3 wt.% Ce addition (providing an increase in ultimate tensile strength of approximately 30 MPa) at no expense to intergranular corrosion resistance, indicating that Ce micro-alloying could comprehensively improve the properties of Al–Mg–Mn alloys.

中文翻译：

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添加Ce提高高镁合金Al-Mg-Mn合金的强度和耐腐蚀性

摘要 微合金化被认为可以提高运输应用中常用的铝镁合金的性能。系统地研究了 Ce 添加量（不高于 0.9 wt%）对 Al-9.2Mg-0.7Mn 合金的微观结构、腐蚀行为和机械性能的影响，以评估其在工程应用中的潜在用途。由于 Ce 偏析在富锰相中，Ce 添加对耐点蚀性有显着影响。特别是，在敏化状态下合金的点蚀速率随着 Ce 的添加显着降低，并且分别比含有 0.1 和 0.3 wt.% Ce 的合金基体低约 48% 和 53%。此外，其强度提高了 0.3 重量％。