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K M ZOHDY
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Volume 45 All articles Published: 14 September 2022 Article ID 0181
EIS characteristics of antimony and its anodic oxide film in sulphuric acid solution
The corrosion behaviour of antimony (Sb) and the stability of the anodic-generated coating on its surface were studied in a 4.97 M H$_2$SO$_4$ 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 preimmersion 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 $E_a$ (activation energy), ${\Delta}H$ (enthalpy change) and DS (entropy change) were calculated.
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Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
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Bulletin of Materials Science | News
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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