What question did this study set out to answer?

The study aims to evaluate how micro alloying with Ge impacts the corrosion resistance of BCC Mg-Li alloys.

June 3, 2026

The Influence of Ge on the Passivity and Localized Corrosion of BCC Mg-Li Alloys

Key Points

The study aims to evaluate how micro alloying with Ge impacts the corrosion resistance of BCC Mg-Li alloys.
Investigated corrosion behavior using potentiodynamic polarization, electrochemical impedance spectroscopy, and in situ optical imaging.
Examined Mg-11Li-xGe alloys with Ge contents of 0, 0.27, and 0.42 wt% in 0.1 M NaCl solution.
Ge was found to act as a cathodic poison, enhancing the stability of the surface film on the Mg-Li alloy.
A limit to Ge's benefits was observed due to cathodic current sharing and micro-galvanic coupling effects.

Abstract

The effect of micro alloying additions of Ge on the corrosion behavior of BCC Mg-11Li-xGe (x = 0, 0.27, 0.42 wt%) alloys was investigated via a combination of potentiodynamic polarization, electrochemical impedance spectroscopy, and in situ optical imaging in quiescent 0.1 M NaCl. The results revealed that Ge can be an effective cathodic poison within a BCC Mg-Li alloy while improving the stability of the native air formed surface film. However, a limit to the beneficial effect of Ge was found due to sharing of the cathodic current between the matrix and Ge-Rich phase and micro-galvanic coupling effects.

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