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Understanding the electrochemical behavior of bulk-synthesized MgZn2 intermetallic compound in aqueous NaCl solutions as a function of pH

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Abstract

The electrochemical behavior of a bulk-synthesized MgZn2 intermetallic compound in aerated 0.1 M NaCl solutions has been studied as a function of pH and applied potential using polarization techniques, electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), and focused ion beam-transmission electron microscopy (FIB-TEM). The anodic activity of MgZn2 is seen to decrease with an increase in pH value. Polarization tests reveal two limiting current densities in pH 4 solution at relatively high and low potentials. At pH 12, passivity is observed with a lower limiting current density compared to those observed at pH 4. The corrosion film formed after potentiostatic polarization in the pH 4 solution is composed of a bilayer at a less negative potential and a single layer at a more negative potential. In the case of pH 12 solution, a protective compact bilayer film is formed irrespective of the potential within the passive zone. Overall, the corrosion mechanism of MgZn2 is by early dissolution of Mg leading to a Zn-enriched surface whose subsequent dissolution depends on the value of the applied potential.

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Funding

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51571201).

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Rd, Shenyang, 110016, China

    Alexander I. Ikeuba & Bo Zhang

  2. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Alexander I. Ikeuba, Bo Zhang, Jianqiu Wang, En-Hou Han & Wei Ke

  3. University of Chinese Academy of Sciences (UCAS), 19A Yuquan Road, Shijingshan District, Beijing, 100049, China

    Alexander I. Ikeuba

  4. Department of Pure and Applied Chemistry, University of Calabar, PMB 1115, Calabar, Nigeria

    Alexander I. Ikeuba

  5. CRRC Qingdao Sifang CO., LTD, Qingdao, 266111, China

    Fujun Kou & Haowei Duan

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  1. Alexander I. Ikeuba
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  2. Fujun Kou
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Correspondence to Bo Zhang.

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Ikeuba, A.I., Kou, F., Duan, H. et al. Understanding the electrochemical behavior of bulk-synthesized MgZn2 intermetallic compound in aqueous NaCl solutions as a function of pH. J Solid State Electrochem 23, 1165–1177 (2019). https://doi.org/10.1007/s10008-019-04210-y

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  • DOI: https://doi.org/10.1007/s10008-019-04210-y

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