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Effect of 2-mercaptobenzothiazole concentration on sour-corrosion behavior of api x60 pipeline steel:Electrochemical parameters and adsorption mechanism

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International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 271-282页

作者： Masoud Sabzi Amir Hayati Jozani Farzad Zeidvandi Majid Sadeghi Saeid Mersagh Dezfuli Young Researchers and Elite Club Dezful BranchIslamic Azad UniversityDezfulIran Department of Materials Science and Engineering Science and Research BranchIslamic Azad UniversityTehranIran Center of Excellence for Surface Engineering and Corrosion Protection of Industrial School of Metallurgy and Materials EngineeringCollege of EngineeringUniversity of TehranP.O.Box 11155-4563TehranIran

We investigated the effect of the 2-mercaptobenzothiazole concentration on the sour-corrosion behavior of api x60 pipeline steel in an environment containing H_(2)S at 25°C and in the presence of 0,2.5,5.0,7.5,and 10.0 g/L of 2-mercaptobenzothiazole *** examine this behavior,we conducted open-circuit potential(OCP),potentiodynamic polarization,and electrochemical impedance spectroscopy(EIS)*** dispersive spectroscopy and scanning electron microscopy were also used to analyze the corrosion *** results of the OCP and potentiodynamic polarization tests revealed that 2-mercaptobenzothiazole reduces the speed of both the anodic and cathodic *** assessment of the Gibbs free energy of the inhibitor(△G_(ads)^(■))indicated that its value was less than-20 kJ·mol^(-1)and greater than-40 k J·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 *** addition,as the△G_(ads)^(■)dsvalue was negative,we could conclude that the adsorption of 2-mercaptobenzothiazole onto the surface of the pipeline steel occurs *** EIS results indicate that with the increase in the 2-mercaptobenzothiazole inhibitor concentration,the corrosion resistance of api x60 steel *** analysis of the corrosion products revealed that iron sulfide compounds form on the *** summary,the results showed that an increase in the inhibitor concentration results in a decrease in the corrosion rate and an increase in inhibitory ***,we found that the 2-mercaptobenzothiazole adsorption process on the api x60 steel surfaces in an H2 S-containing environment follows the Langmuir adsorption isotherm and occurs spontaneously.

关键词： api x60 steel sour corrosion 2-mercaptobenzothiazole inhibitor concentration electrochemical parameters environments containing hydrogen sulfide

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