Corrosion Inhibition and Adsorption Behavior of Distiller′s Grains Extractive for Q235 Steel in Hydrochloric Acid Medium

The corrosion inhibition and adsorption behavior of the extractive from distiller′s grains for Q235 steel in hydrochloric acid medium was studied by weight loss and electrochemical methods. The results of weight loss showed that the inhibition efficiency was up to 94.41％ when the inhibitor concentration was 24 g/L in 1 mol/L HCl solution at 25 ℃. The results of polarization curves showed that the extractive from distiller′s grains was a mixed-type inhibitor in hydrochloric acid medium. The fitting results showed that the adsorption met the El-Awady thermodynamic kinetic model and was inline with the Flory-Huggins isotherm.