Electrical and Gravimetric Estimation of the Corrosion Inhibition of Three Synthesized Cationic Surfactants N-(3-(Butylidene Amino) Propyl)-N, N-Dimethyl Alkan-1-Ammonium Bromide Derivatives in 1 M HCl

Abstract The inhibiting effect of three synthesized corrosion inhibitors that are based on Schiff base and named N-(3-(butylidene amino) propyl)-N,N-dimethyl decan-1-ammonium bromide, N-(3-(butylidene amino) propyl)-N,N-dimethyl dodecan-1-ammomium bromide, and N-(3-(butylidene amino) propyl)-N,N-dimethyl hexadecan-1-ammonium on the corrosion rate of mild steel in 1.0 M hydrochloric acid was monitored through gravimetric and electrochemical techniques at 25°C. The temperature effect ranging from 25°C to 70°C on the corrosion rate has been studied and used for predicting the adsorption isotherm and thermodynamic parameters. The propensity of the synthesized compounds to adsorb on the steel surface were found to obey Villamil adsorption isotherm. The inhibition efficiency was increased concurrently with a plethora of inhibitor concentration and a rise of the solution temperature. Polarization curves prove that the tested compounds act as mixed-type inhibitors. Double-layer capacitances of inhibitors decrease when compared to the blank solution.