Effect of 2-mercaptobenzothiazole concentration on sour-corrosion behavior of API X60 pipeline steel: Electrochemical parameters and adsorption mechanism

Masoud Sabzi; Amir Hayati Jozani; Farzad Zeidvandi; Majid Sadeghi; Saeid Mersagh Dezfuli

doi:10.1007/s12613-020-2156-3

Volume 29 Issue 2

Feb. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(2): 271-282

Masoud Sabzi, Amir Hayati Jozani, Farzad Zeidvandi, Majid Sadeghi, and Saeid Mersagh Dezfuli, Effect of 2-mercaptobenzothiazole concentration on sour-corrosion behavior of API X60 pipeline steel: Electrochemical parameters and adsorption mechanism, Int. J. Miner. Metall. Mater., 29(2022), No. 2, pp. 271-282. https://doi.org/10.1007/s12613-020-2156-3

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Masoud Sabzi, Amir Hayati Jozani, Farzad Zeidvandi, Majid Sadeghi, and Saeid Mersagh Dezfuli, Effect of 2-mercaptobenzothiazole concentration on sour-corrosion behavior of API X60 pipeline steel: Electrochemical parameters and adsorption mechanism, Int. J. Miner. Metall. Mater., 29(2022), No. 2, pp. 271-282. https://doi.org/10.1007/s12613-020-2156-3

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Research Article

Effect of 2-mercaptobenzothiazole concentration on sour-corrosion behavior of API X60 pipeline steel: Electrochemical parameters and adsorption mechanism

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Corresponding author:
Masoud Sabzi E-mail: mas.metallurg88@gmail.com
Received: 17 May 2020; Revised: 12 July 2020; Accepted: 28 July 2020; Available online: 30 July 2020

Abstract

Abstract

We investigated the effect of ‎the 2-mercaptobenzothiazole concentration on the sour-corrosion behavior of API ‎X60 pipeline steel in an environment containing H₂S at 25°C and in the presence of 0, 2.5, 5.0, 7.5, and 10.0 g/L of ‎2-mercaptobenzothiazole inhibitor. To examine this behavior, we conducted open-circuit potential (OCP), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) tests. Energy dispersive spectroscopy and scanning electron microscopy were also used to analyze the corrosion products. The results of the OCP and potentiodynamic polarization tests revealed that ‎2-mercaptobenzothiazole reduces the speed of both the anodic and cathodic reactions. An assessment of the Gibbs free energy of the inhibitor (
$ {\Delta G}_{\mathrm{a}\mathrm{d}\mathrm{s}}^{\ominus} $
) indicated that its value was less than −20 kJ·mol⁻¹ and greater than −40 kJ·mol⁻¹. Therefore, the adsorption of 2-mercaptobenzothiazole onto the surface of the API X60 pipeline steel occurs both physically and chemically, the latter of which is particularly intentional. In addition, as the
$ {\Delta G}_{\mathrm{a}\mathrm{d}\mathrm{s}}^{\ominus} $
value was negative, we could conclude that the adsorption of 2-mercaptobenzothiazole onto the surface of the pipeline steel occurs spontaneously. The EIS results indicate that with the increase in the 2-mercaptobenzothiazole inhibitor concentration, the corrosion resistance of API X60 steel increases. An analysis of the corrosion products revealed that iron sulfide compounds form on the surface. In summary, the results showed that an increase in the inhibitor concentration results in a decrease in the corrosion rate and an increase in inhibitory efficiency. Additionally, we found that the 2-mercaptobenzothiazole adsorption process on the API X60 steel surfaces in an H₂S-containing environment follows the Langmuir adsorption isotherm and occurs spontaneously.
- API X60 steel;
- sour corrosion;
- 2-mercaptobenzothiazole;
- inhibitor concentration;
- electrochemical parameters;
- environments containing hydrogen sulfide

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