The influence of Zn concentration on microstructure and corrosion performance of the Mg–xZn alloys microalloyed with Ca and Ce was investigated through optic microscopy, scanning electron microscopy, hydrogen evolution, dynamic polarization and electrochemical impedance spectroscopy experiments.
In this paper, Mg–xZn alloys (x = 0.5∼2.0 Wt.%) microalloyed with Ca and Ce (0.2 Wt.% each) were prepared.
As the increase of Zn concentration, the number of second phase particles (Mg-Zn-Ca, Mg-Zn-Ce and Mg-Ce phases) increased, and when the Zn concentration increased to 2.0 Wt.%, the new second phase Mg-Zn phase was precipitated.
The influence of Zn concentration on corrosion mechanism of Mg-xZn alloys microalloyed with Ca and Ce was revealed. Increasing of the Zn concentration resulted in the intensification of galvanic corrosion. When Zn concentration was 0.5 Wt.%, the alloy showed the lowest corrosion rate (0.61 mm y-1), which was about 1/2 of that of Mg-2.0Zn-0.2Ca-0.2Ce alloy.
This work was supported by the Project for Chongqing University Innovation Research Group of Chongqing Education Committee (CXQT19008), the Chongqing Talent Plan for Innovation and Entrepreneurship Demonstration Team (CQYC201903243), the S&T Project of Science and Technology Bureau of Bishan District in Chongqing (Bskj20200011), National Natural Science Foundation of China (U1810122), Key Research and Development Program of Shanxi Province (201903D421076) and Talent Training Program for Shandong Province Higher Educational Youth Innovative Teams (2019).
Zhang, C., Peng, C., Huang, J., Zhao, Y., Huang, G., Wu, L., Wang, G. and Zhang, H. (2021), "Effect of Zn concentration on microstructure and corrosion resistance of Mg-Zn alloys microalloyed with Ca and Ce", Anti-Corrosion Methods and Materials, Vol. 68 No. 2, pp. 130-136. https://doi.org/10.1108/ACMM-11-2020-2407
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