Electrochemical and thermodynamical investigation of schiff's bases of glycine and aldehydes on corrosion inhibition behavior of mild steel in 1M hydrochloric acid medium

Three schiff's bases (sbs) namely 2-(2-hydroxybenzylidene amino) acetic acid (hbaa),2-(4-(dimethylamino) benzylidene amino) acetic acid (dmba),and 2-(2-hydroxy-4-methyxybenzylidene amino) acetic acid (hmba) were synthesized and their effects on the electrochemical behavior of mild steel in 1 m hcl was investigated using gravimetric measurements,tafel extrapolation technique,linear polarization resistance (lpr) and electrochemical impedance spectroscopy (eis) methods. tafel polarization measurements revealed that these schiff's bases act as mixed-type inhibitors. among the studied sbs,hmba exhibited the best inhibition efficiency of 95% at 400 ppm concentration. some thermodynamic parameters were also determined to investigate the mechanism of adsorption. the results obtained from weight loss and electrochemical methods are in good agreement.