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Corrosion Inhibition Mechanism of Imidazoline‐Based Dissymmetric Bis‐Quaternary Ammonium Salts with Different Hydrophobic Chain Length on Q235 Steel in 1 M HCl Solution
Author(s) -
Zhang Jing,
Zhu Fengmin,
Song Weiwei,
Du Min
Publication year - 2013
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-012-1390-8
Subject(s) - chemistry , adsorption , dielectric spectroscopy , ammonium , langmuir adsorption model , electrochemistry , imidazoline receptor , corrosion , inorganic chemistry , salt (chemistry) , hydrophobic effect , organic chemistry , electrode , medicine
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 G ads 0 are around or lower than 40 kJ mol −1 , indicating that there is a stronger chemical adsorption.