Corrosion Properties and Microstructure of a Broad Range of Ce Additions on Mg–Zn Alloy

抄録

To launch a new class of Mg alloys based on the Mg–Zn system, the effect of microstructural evolution on the corrosion properties in Mg–Ce–Zn system has been investigated. The alloys were fabricated by using a vacuum induction melting method under an argon atmosphere. Potentiodynamic polarization and hydrogen evolution test were carried out in 3.5% NaCl solution of pH 7.2 at room temperature to evaluate the corrosion properties of Mg–Ce–Zn alloys. The main constituents in Mg₉₉Ce_0.5Zn_0.5, Mg₉₈Ce_1.5Zn_0.5 and Mg₉₂Ce_7.5Zn_0.5 alloys are α-Mg and Mg₁₂Ce phase. On the other hand, Mg₄₁Ce₅ and Mg₃Ce phases are present in Mg₈₈Ce_11.5Zn_0.5 and Mg₈₆Ce_13.5Zn_0.5. Although Ce additions on Mg alloy could tend to ennoble the corrosion potential, the corrosion rate was increased with excessive Ce additions.