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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

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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.

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ACKNOWLEDGMENTS

This research is supported by open fund of the State Key Laboratory of Refractories and Metallurgy (Grant No. G201702). Thanks to Frontier Research Center for Materials Structure, Shanghai Jiao Tong University, for its supports of JEM-ARM200F Atomic Scale High Angle Annular Dark Field-Scanning Transmission Electron Microscopy (HAADF-STEM) and FEI Versa 3D Dual Beam Field Emission Scanning Electron Microscope (FE-SEM).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China

    Yanlong Zou & Xia Chen

  2. Frontier Research Center for Materials Structure, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Bin Chen

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  1. Yanlong Zou
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  2. Xia Chen
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Correspondence to Bin Chen.

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Zou, Y., Chen, X. & Chen, B. Influence of interactions between β′ precipitates and long period stacking ordered structures on corrosion behaviors of Mg–10Gd–5Y–2Zn–0.5Zr (wt%) alloy. Journal of Materials Research 33, 745–757 (2018). https://doi.org/10.1557/jmr.2017.448

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