Abstract
In this study, imidazole derivative-based new ionic liquids were investigated as corrosion inhibitors. These new ionic liquids (ILs) are 1,3-dipropyl-2-(2-propoxyphenyl)-4,5-diphenylimidazole iodide (IL1) and 1,3-dibutyl-2-(2-butoxyphenyl)-4,5-diphenylimidazole iodide (IL2). The corrosion inhibition effects of two new ILs were observed on carbon steel in brackish water media (1% NaCl solution). Carbon steel coupons were exposed to 1% NaCl solution with various concentrations of ILs. Corrosion inhibition effects were tested by the electrochemical impedance spectroscopy (EIS) method and the Tafel method at various temperatures ranging from 25 °C to 55 °C. The results showed that ILs have potential as corrosion inhibitors and the adsorption mechanisms of IL1 and IL2 on carbon steel surfaces were also determined, which followed the Langmuir adsorption isotherm model. Acquisition of ∆Gads values of IL1 and IL2 were −35.04 and −34.04 kJ/mol, respectively. The thermodynamic data of the ILs show that semi-chemical and or physical adsorptions occurred on carbon steel surfaces.
Highlights
Carbon steel is used significantly in many industrial applications due to its excellent mechanical properties [1,2,3]
Percent inhibition efficiency (IE%) of IL1 and IL2 were calculated by Equation (1) as per Popova et al [36]: R
ionic liquids (ILs) used was 20–120 ppm to get the optimum concentration for corrosion inhibition in brackish water
Summary
Carbon steel is used significantly in many industrial applications due to its excellent mechanical properties [1,2,3]. Carbon steel pipes are used to transfer crude oil which contains corrosive agents and are usually placed under the sea in the oil and gas industry. Corrosive agents in crude oil and brackish water include salts, water, oxygen, acidic, and basic compounds [4,5]. They promote the corrosion reactions, which occur on the internal and the external surfaces of carbon steel pipes. The isolation of carbon steel surfaces from corrosion agents is an effective strategy to prevent electrochemical corrosion [4,8]. Among several corrosion prevention methods commonly used, the use of corrosion inhibitor is an effective method and the most appropriate way to prevent corrosion [9,10,11,12]
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