The effect of a stearic imidazoline derivative, namely, 1-[N,N'-bis(hydroxylethylether) -aminoethyl]-2-stearicimidazoline (HASI) on the protective property of oxide film formed on the carbon steel in saturated Ca(OH)(2) solution was investigated by electrochemical measurements in conjunction with Raman spectroscopy technique. Computational simulations and point defect model (PDM) were also employed to elucidate the influence of inhibitor on the oxide film formed on carbon steel surface. The results indicated that HASI can effectively retard the carbon steel corrosion in alkaline solution by suppressing dominantly the cathodic reduction of oxygen. The addition of the inhibitor can enhance the stability of Fe3O4 to be further oxidized into ferric species and lead to the formation of a more compact protective film on carbon steel surface, and then reduces the defect density in the surface film and improve its protective property.
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