Abstract:

The adsorption behaviour of Glycine on the surface of FeCO3 and its inhibition mechanism in sodium bicarbonate solution were studied by polarization curves and EIS. Results indicate that GLY forms multi-layer on the surface of pre-corrosion A3 steel and there is desorption process, the inhibition mechanism is geometric blocking effect and inhibition effect is better under the concentration of 100 mg/L. The adsorption is spontaneity; Gibbs free energy is –27.364 kJ/mol in low concentration and is –13.152 kJ/mol in high concentration of GLY.

Key words: sodium bicarbonate, Glycine, adsorption, corrosion film