Adsorption and inhibition effect of Ascorbyl palmitate on corrosion of carbon steel in ethanol blended gasoline containing water as a contaminant

• Inhibition performance was studied using weight loss and EIS methods.
• The addition of ethanol and water to gasoline increase the corrosion rate of C-steel.
• Ascorbyl palmitate has good inhibition efficiency for C-steel in blend fuel.
• Efficiency more than 96% was obtained with 120 mg l−1 AP at 298 K.
• The adsorption of AP on C-steel surface obeys Langmuir adsorption isotherm.

The adsorption and inhibition effect of Ascorbyl palmitate (AP) on carbon steel in ethanol blended gasoline containing water as a contaminant (GE10 + 1%water) was studied by weight loss and electrochemical impedance spectroscopic (EIS) techniques. The results showed that the addition of ethanol and water to gasoline increase the corrosion rate of carbon steel. AP inhibits the corrosion of carbon steel in (GE10 + 1% water) solution to a remarkable extent. The adsorption of AP on the carbon steel surface was found to obey the Langmuir adsorption isotherm model. The values of activation energy (Ea) and various thermodynamic parameters were calculated and discussed.

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