Electrochemical studies on the inhibition behavior of copper corrosion in pickling acid using quaternary ammonium salts
By M.A. Hegazy and Ahmed Abdel Nazeer and K. Shalabi
Published in Journal of Molecular Liquids
2015
Abstract
The inhibition effect of two quaternary ammonium salts namely: N1,N2-didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide (I) and N-(2-hydroxyethyl)-N,N-dimethyldodecan-1-aminium bromide (II) on the corrosion of copper in 1 M \HNO3\ has been investigated by polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Polarization studies showed that these compounds are mixed-type inhibitors. The inhibition efficiency increases with increasing the inhibitor concentration and the maximum inhibition (93.9% and 90.8%) was obtained in the presence of 1