New cationic surfactant as corrosion inhibitor for mild steel in hydrochloric acid solutions

Z. Abdel Hamid, T.Y. Soror, H.A. El‐Dahan, A.M.A. Omar
1998 Anti-Corrosion Methods and Materials  
Cationic surfactant Benzalkonium chloride was evaluated as inhibitor for carbon steel in presence of 1.0 M HCl by different methods like Chemical Method (Weight loss) or Electrochemical Impedance Spectroscopy (EIS), Potentiodynamic polarization and Electrochemical Frequency Modulation (EFM). The effect of temperature on the corrosion rate was evaluated. Tafel polarization proofed that the surfactant act as mixed type inhibitor. Langmuir's adsorption isotherm was the preferable fitted isotherm.
more » ... e fitted isotherm. The results showed that the efficiency of the investigated surfactant increases with raising both concentration and temperature. The thermodynamic parameters of activation and adsorption were calculated and discussed. The surfactant's adsorption led to a reduction of the double layer capacitance (C dl ) and an increase in the charge transfer resistance (R ct ). Quantum Chemical Technique has been employed to discuss the inhibition efficiency by effectiveness of molecular structure of investigated surfactant. The various techniques which used have inhibition efficiency (IE) with the same trend.
doi:10.1108/00035599810234605 fatcat:2lx22j632rc4tnmlq7f5gmcmgi