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Synergistic Corrosion Inhibition of Benzotriazole and Thiourea for Refineries and Petrochemical Plants

  • PHYSICOCHEMICAL PROBLEMS OF MATERIALS PROTECTION
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Abstract

In the present work, the synergistic effects of two corrosion inhibitors, thiourea and benzotriazole, on the corrosion behavior of copper in 1 M H2SO4 solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy methods. Scanning electron microscope was used to study the surface morphology, and Fourier-transform infrared spectroscopy was employed to investigate the adsorption of corrosion inhibitor and the formed film. Electrochemical test results indicate that the corrosion inhibition is dependent on the concentration of corrosion inhibitor and its molecular structure. Simultaneous use of thiourea and benzotriazole leads to the achievement of higher corrosion inhibition efficiency for low concentrations of the corrosion inhibitors. The highest corrosion inhibition efficiency achieved is 96.6% at benzotriazole and thiourea concentrations of 100 and 50 ppm, respectively. The adsorption of these two corrosion inhibitors on the surface of copper resulted in formation of a protective layer, which occurs through both chemical adsorption and physical adsorption. Langmuir modified adsorption isotherm is the best fitting for experimental data.

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Authors and Affiliations

  1. Materials Engineering Department, Tarbiat Modares University, P.O.Box:14115-143, Tehran, Iran

    Mahmoud Saberion, Mohammad Hossein Allahyarzadeh & Alireza Sabour Rouhaghdam

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  1. Mahmoud Saberion
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  2. Mohammad Hossein Allahyarzadeh
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  3. Alireza Sabour Rouhaghdam
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Saberion, M., Allahyarzadeh, M.H. & Rouhaghdam, A.S. Synergistic Corrosion Inhibition of Benzotriazole and Thiourea for Refineries and Petrochemical Plants. Prot Met Phys Chem Surf 58, 200–215 (2022). https://doi.org/10.1134/S2070205122010178

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