The influence of three quinoline derivatives (8QNs) namely, ethyl 2-(((8-hydroxyquinolin-5-yl)methyl)amino)acetate (8QN1), 5-((benzylamino)methyl)quinolin-8-ol (8QN2) and 5-(azidomethyl)quinolin-8-ol (8QN3) on the mild steel corrosion in 1 M HCl was studied by weight loss and electrochemical methods. Results showed that 8QN3 shows maximum inhibition efficiency of 90% at 5×10-3 M concentration. Polarization study revealed that the 8QNs act as mixed type inhibitors. EIS measurements showed that the studied compounds inhibit mild steel corrosion by adsorbing on the steel surface. Results showed that inhibition efficiency increases with concentration. Adsorption of 8QNs on the mild steel surface obeyed the Langmuir adsorption isotherm.
