Abstract
The inhibition effect of the synergistic combination of essential oil extract (jojoba and lavender oil) on the localized corrosion resistance of P4 low grade alloy steel in 1.5 M H2SO4 solution was studied with potentiodynamic polarization, ATF-FTIR spectroscopy, optical microscopy and open circuit potential measurement. The oil extracts significantly influenced the mechanism of corrosion reaction on the steel with highest and lowest inhibition efficiency values of 90.28% and 77.76%. Anodic potential shift with respect to the blank steel dominated the redox mechanism due to surface coverage of the inhibitor molecules. Passivation range and pitting potential of the steel significantly increased during potential scanning from 1.096 VAg/AgCl and 0.766 VAg/AgCl at 1% inhibitor concentration to 1.118 VAg/AgCl and 1.035 VAg/AgCl at 5% concentration. Identified (ATF-FTIR spectroscopy) functional groups within oil extracts compound completely adsorbed onto the steel according to Langmuir adsorption isotherm (correlation coefficient of 0.9642). Thermodynamic derivations confirmed physisorption adsorption mechanism. Severe surface deterioration and enlarged corrosion pits were visible on the morphology of the uninhibited steelwhich significantly contrasts the morphology of the inhibited steel.
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