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The surface properties of a series of imidazoline‐based dissymmetric bis‐quaternary ammonium (DBA) salts with different hydrophobic chain lengths DBA‐12, DBA‐14 and DBA‐16 were determined. The adsorption behaviors of these compounds in 1 M HCl solution and their inhibitive effect on Q235 steel (U12350) were investigated using the weight‐loss method, polarization, and electrochemical impedance spectroscopy. Results indicate that the three inhibitors all showed good inhibition performance for Q235 Steel in 1 M HCl solution and were found to be mixed‐type inhibitors. The adsorption behavior of the three inhibitors can fit the Langmuir isotherm equation and the values of are around or lower than 40 kJ mol−1, indicating that there is a stronger chemical adsorption.
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Zhang et al. (2012) studied this question.
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