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EIS characteristics of antimony and its anodic oxide film in sulphuric acid solution

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Abstract

The corrosion behaviour of antimony (Sb) and the stability of the anodic-generated coating on its surface were studied in a 4.97 M H2SO4 solution using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, scanning electron microscopy (SEM) and atomic force microscopy (AFM). According to the CV data, the current plateau value increases as the scan rate increases, indicating that anodic layer development on the Sb surface occurs via a low-field migration mechanism. The EIS results confirmed that the pre-immersion oxide film and the anodic-produced layer on Sb are liable to dissolution in concentrated acid solution. The polarization results revealed that when the temperature rises, the rate of Sb corrosion in the acid solution increases. SEM and AFM surface investigation of the anodic layer generated on the antimony surface revealed that it is homogenous throughout its extension on the surface and lacks pores. For the corrosion of Sb in concentrated acid solution, the thermodynamic parameters Ea (activation energy), ΔH (enthalpy change) and ΔS (entropy change) were calculated.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Cairo University, Giza, 12613, Egypt

    A S Mogoda

  2. Higher Technology Institute, Tenth of Ramadan City, 44629, Egypt

    K M Zohdy

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  1. A S Mogoda
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  2. K M Zohdy
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Correspondence to A S Mogoda.

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Mogoda, A.S., Zohdy, K.M. EIS characteristics of antimony and its anodic oxide film in sulphuric acid solution. Bull Mater Sci 45, 181 (2022). https://doi.org/10.1007/s12034-022-02771-9

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  • DOI: https://doi.org/10.1007/s12034-022-02771-9

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