Effect of NaNO<sub>3</sub> concentration on anodic electrochemical behavior on the Sb surface in NaOH solution

Yun-long He; Rui-dong Xu; Shi-wei He; Han-sen Chen; Kuo Li; Yun Zhu; Qing-feng Shen

doi:10.1007/s12613-018-1572-0

Volume 25 Issue 3

Mar. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(3): 288-299

Yun-long He, Rui-dong Xu, Shi-wei He, Han-sen Chen, Kuo Li, Yun Zhu, and Qing-feng Shen, Effect of NaNO₃ concentration on anodic electrochemical behavior on the Sb surface in NaOH solution, Int. J. Miner. Metall. Mater., 25(2018), No. 3, pp. 288-299. https://doi.org/10.1007/s12613-018-1572-0

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Yun-long He, Rui-dong Xu, Shi-wei He, Han-sen Chen, Kuo Li, Yun Zhu, and Qing-feng Shen, Effect of NaNO3 concentration on anodic electrochemical behavior on the Sb surface in NaOH solution, Int. J. Miner. Metall. Mater., 25(2018), No. 3, pp. 288-299. https://doi.org/10.1007/s12613-018-1572-0

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Research Article

Effect of NaNO₃ concentration on anodic electrochemical behavior on the Sb surface in NaOH solution

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Corresponding author:
Rui-dong Xu E-mail: rdxupaper@aliyun.com
Received: 28 June 2017; Revised: 8 November 2017; Accepted: 16 November 2017

Abstract

Abstract

The effect of NaNO₃ concentration on the anodic electrochemical behavior of antimony in 4 M NaOH solution was investigated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analyses. The mechanism of NO₃^- concentration effect on the anodic electrochemical behavior of antimony was proposed, and its availability was confirmed by experimental results. The effect of NaNO₃ on the anodic behavior of antimony in NaOH solution can be interpreted as a stepwise formation of different antimony compounds with different NaNO₃ concentrations. Metallic antimony is apt to be oxidized into Sb₂O₃ within the NaNO₃ concentration range of 0-0.48 M. NaSbO₃ can be found on the antimony surface when the NaNO₃ concentration increases gradually. Insoluable NaSbO₃ inhibits the anodic oxidation of antimony due to its shielding effect on the mass transport of the reactants and products. Surface morphology and composition were analyzed by X-ray photoelectron spectroscopy (XPS), scanning electronic microscopy (SEM), and electron dispersion spectroscopy (EDS) analyses. Results indicate that the anodic oxidation layer is composed of Sb₂O₃, NaSbO₃, and Sb. The atomic proportion of antimony in the form of NaSbO₃ increases with increasing NaNO₃ concentration due to the powerful oxidizing property of NaNO₃.
- antimony;
- electrochemical behavior;
- alkalinity;
- electrode corrosion;
- anodic oxidation;
- corrosion mechanism

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