Analysis of Adsorption Properties and Corrosion Inhibition of Mild Steel in Hydrochloric Acid Solution by Synthesized Quinoline Schiff Base Derivatives

Two synthesized Schiff base derivatives were analyzed as corrosion inhibitors for mild steel in 1 N HCl solution by a series of known techniques such as electrochemical impedance spectroscopy, weight loss, potentiodynamic polarization, linear polarization and scanning electron microscopic at different inhibitor concentrations. The effects demonstrate that two Schiff base derivatives are excellent inhibitors, and inhibition efficiency accepts the order: SB1 > SB2. The adsorption of each inhibitor on metal surface obeys Langmuir adsorption isotherm. Two Schiff base derivatives acted as mixed-type inhibitors. The surface of the mild steel was examined by scanning electron microscope in the absence and presence of Schiff base derivatives.