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Effect of I-phase morphology and microstructure transformation in biomedical Mg-3Zn-1Mn-1Y alloys on vitro degradation behavior in dynamic simulated body fluid

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Abstract

The corrosion mechanism of as-cast, heat-treated (H400) and extruded (E30, E60, E90) Mg-3Zn-1Mn-1Y alloys with different microstructure is investigated by scan electron microscope (SEM), scan Kelvin probe force microscope (SKPFM), X-ray photoelectron spectroscopy (XPS), electrochemical impedance analysis and immersion experiments equipped with a dynamic corrosion device. The relevant results are as follows: continuously strip-like I-phase (Mg3Zn6Y) in as-cast alloy distributed along the grain boundary played a significant obstacle impact during corrosion, whereas this capability is weakened after heat treatment and large plastic extrusion deformation. However, extrusion deformation significantly improved alloy corrosion performance, the extruded E30 alloy performed superior anti-corrosion behavior among the three extruded alloys owing to the smaller potential difference between I-phase (2.59 V) and DRXed (2.51 V) or un-DRXed (2.54 V) grains. In addition, the corrosion obstacle effect of grains boundaries (the grain boundary has higher potential than the Mg substrate), dense corrosion products film protection (isolate the substrate from contact with SBF) and typical basal texture (lower reactivity of base atoms) have great influence on corrosion behavior.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China [No.51574175 and 51474153].

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Authors and Affiliations

  1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, People’s Republic of China

    Xin Cao, Chunxiang Xu & Zhengwei Zhang

  2. Shanxi Province Magnesium Alloy Key Laboratory, Taiyuan, 030024, People’s Republic of China

    Wenfu Yang & Jinshan Zhang

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  1. Xin Cao
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Xin Cao made substantial contributions to the conception, design of the work, analysis and interpretation of data; Zhengwei Zhang drafted the work or revised it critically for important intellectual content; Chunxiang Xu approved the version to be published; and Wenfu Yang and Jinshan Zhang agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy and integrity of any part of the work.

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Correspondence to Chunxiang Xu.

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Cao, X., Xu, C., Zhang, Z. et al. Effect of I-phase morphology and microstructure transformation in biomedical Mg-3Zn-1Mn-1Y alloys on vitro degradation behavior in dynamic simulated body fluid. J Mater Sci 56, 12394–12411 (2021). https://doi.org/10.1007/s10853-021-06091-x

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