Influence of specific second phases on corrosion behaviors of Mg-Zn-Gd-Zr alloys

By S. Yin, Wenchao Duan, Wenhong Liu, Liang Wu, Jiamin Yu, Zilong Zhao, Min Liu, Ping Wang, J. Cui, Zhi-qiang Zhang. 2020

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Abstract The corrosion behavior and mechanism of as-cast and as-extruded Mg-Zn-Gd-Zr alloys with specific ternary phases are investigated using scanning electron microscope (SEM), scanning Kelvin probe force microscope (SKPFM), immersion and electrochemical tests. Lamellar X-Mg12GdZn, net-like W-Mg3Gd2Zn3 and strip-like I-Mg3Zn6Gd phases form successively. The eutectic W-phase owns the highest potential difference of 120 mV with Mg matrix, accelerating micro-galvanic corrosion. Continuously distributed and undersized I-phase leads to uniform corrosion. The as-extruded Mg-3Zn-11Gd-0.6 Zr alloy exhibits superior corrosion resistance, due to the relatively low potential difference between X-phase and matrix, the corrosion barrier effect and typical {0002} texture components.

Subfields: Biomaterials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/694de5b2090c5bf751c008ce49ae091e343731aa