Corrosion inhibition of Al-Mg alloy in hydrochloric acid using Benzylamine- N-(p-methoxy benzylidene)

Corrosion inhibition of Al-Mg alloy in 2.0 M HCl was investigated in the absence and presence of different concentration of Benzylamine-N-(p-methoxy benzylidene) [BANPMB]. Weight loss, galvanostatic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were employed. The inhibition efficiency increased with increase in inhibitor concentration but decreased with increase in temperature. The adsorption of Schiff base was found to obey Langmuir adsorption isotherm. Some thermodynamic parameters (AGads and Qads) and activation energy (Ea) were calculated to elaborate the mechanism of corrosion inhibition. The polarization measurement indicated that the inhibitor is of mixed type. Electrochemical impedance was used to investigate the mechanism of corrosion inhibition. The surface characteristics of inhibited and uninhibited metal samples were investigated by scanning electron microscopy (SEM).