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Influence of interactions between β′ precipitates and long period stacking ordered structures on corrosion behaviors of Mg–10Gd–5Y–2Zn–0.5Zr (wt%) alloy

Published online by Cambridge University Press:  10 December 2017

Yanlong Zou ,
Xia Chen  and
Bin Chen
Yanlong Zou
Affiliation:
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Xia Chen
Affiliation:
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Bin Chen*
Affiliation:
Frontier Research Center for Materials Structure, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
a)Address all correspondence to this author. e-mail: steelboy@sjtu.edu.cn
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Abstract

In this paper, corrosion behaviors of Mg–10Gd–5Y–2Zn–0.5Zr (wt%) alloy (GWZ1052K) in different aging stages are investigated using immersion tests and electrochemical measurements in 3.5 wt% NaCl aqueous solution. The corrosion resistance is found to increase from the solution-anneal to peak-aged condition, which is attributed to microstructure evolutions of β′ precipitates and nearly unchanged long period stacking ordered (LPSO) structures. The broken network LPSO structures no more act as corrosion barriers, thus inversely worsening the galvanic corrosion. β′ precipitates uniformly surround the LPSO lamellas, those partly enhancing corrosion resistance. The potentiodynamic polarization curves also show the best corrosion resistance in the peak-aged stage, suggesting the similar tendency of corrosion behaviors. And the results of electrochemical impedance spectrum are consistent with the morphology of the corrosion surface. Further equivalent circuit is established to investigate the corrosion mechanism.

Keywords

alloycorrosionscanning electron microscopy (SEM)
Type
Articles
Information
Journal of Materials Research , Volume 33 , Issue 6 , 28 March 2018 , pp. 745 - 757
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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