LAUSR

The inhibition performance and mechanism of L-lysine for the corrosion of mild steel in acidic solutions were investigated using electrochemical measurements and Quantum chemical calculation. The results revealed that L-lysine acted as a mixed-type inhibitor with a predominantly cathodic action for mild steel in 1 M HCl solution, but as a modest cathodic inhibitor for mild steel in 0.5 M H2SO4 solution. The adsorption of L-lysine on steel surface obeyed Langmuir adsorption isotherm, and the thermodynamic parameters were further determined based on the model. Moreover, quantum chemical calculation gave further insight into the mechanism of inhibition of L-lysine. Besides, the synergistic inhibition effect of L-lysine and chloride ion was also observed for the corrosion of mild steel.