Initial micro-galvanic corrosion behavior between Mg2Ca and α-Mg via quasi-in situ SEM approach and first-principles calculation

• DOI: 10.1016/j.jma.2021.06.017
• Publication Date: 2021-07-24T11:07:31Z
• Authors: Chen Xu; Jianfeng Wang; Chen Chen; Chao Wang; Yufeng Sun; Shijie Zhu; Shaokang Guan
• Keywords: Galvanic cell; Galvanic anode; Immersion; Galvanic corrosion

The initial micro-galvanic corrosion behavior of Mg‒30wt%Ca alloy only containing Mg2Ca and α-Mg was studied by immersion testing in a 0.9% NaCl solution at 37 °C. quasi-in situ SEM TEM results show that corroded easier than α-Mg, indicating acted as an anode. work function (Φ) for calculated first-principles is significantly lower compared to α-Mg. Volta potential measured scanning Kelvin probe force microscope reveals the had relatively low (ψ) value. Φ ψ values indicate electrochemical nobility, which consistent with experimental phenomenon.