This paper studied the microstructure and corrosion behavior of Mg-xSc binary alloy (x = 0.1–1.5 wt.%) sheets. Sc has a significant effect of refining grains of Mg. The Mg-Sc binary alloys had a single-phase microstructure for Sc concentrations between 0.1−0.3 wt.%, while there were Mg-Sc precipitates for higher Sc concentrations. The Sc additions obviously improved the corrosion resistance of pure Mg due to the refinement of microstructure and the formation of a more protective corrosion products film. The corrosion rate firstly decreased and then increased with increasing Sc concentration. Mg-0.3Sc has the lowest corrosion rate.

中文翻译：

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Mg-Sc 二元合金在 3.5 wt.% NaCl 溶液中的显微组织和腐蚀行为

本文研究了 Mg-xSc 二元合金 (x = 0.1–1.5 wt.%) 板材的微观结构和腐蚀行为。Sc对细化Mg的晶粒有显着的作用。Mg-Sc 二元合金在 Sc 浓度为 0.1-0.3 wt.% 时具有单相微观结构，而在 Sc 浓度较高时有 Mg-Sc 沉淀物。由于显微组织的细化和更具保护性的腐蚀产物膜的形成，Sc的添加明显提高了纯镁的耐腐蚀性。随着Sc浓度的增加，腐蚀速率先降低后增加。Mg-0.3Sc 的腐蚀速率最低。