Quantum Chemical and Electrochemical Studies on the Inhibitive Effect of Carboxymenthylchitosan for Mild Steel in Different PHs

Shou Gang Chen; Sha Cheng; Kin Tak Lau; Yan Sheng Yin

doi:10.4028/www.scientific.net/AMR.47-50.205

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Quantum Chemical and Electrochemical Studies on the Inhibitive Effect of Carboxymenthylchitosan for Mild Steel in Different PHs

Abstract:

The influence of carboxymenthylchitosan(CM-chitosan) on the corrosion of mild steel in different pHs was studied by the quantum chemical calculation and electrochemical measurements. Mulliken atomic charges and LUMO energies calculated by DFT method for CM-chitosan and protonated CM-chitosan show that the protonated CM-chitosan adsorbs easier on the surface of mild steel. The expeimental results of polarization curves and electrochemical impedance spectroscopy (EIS) also indicate that the acid media has the best inhibition efficiency for CM-chitosan. Furthermore, the inhibitive effect of CM-chitosan for mild steel in 1 M HCl solution was studied by weight loss measurements, and the inhibition efficiency increases with the concentration of CM-chitosan to attain 93 % at 200mg/l.