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In this study, lignin, a polyhydroxy compound, was extracted from black liquor of pulp and paper industry, and characterized. In view of t he potential of such polyhydroxy compounds to adsorb onto metal surfaces, the corros i n inhibition efficiency of lignin on the corrosion of mild steel by 0.5 M H 2SO4 has been studied using weight loss method, electrochemical polarization and impedance methods. The morphological changes of the surface during corrosion, in the pre sence and absence of the inhibitor, were studied by scanning electron microscopy. Resul ts of these studies show that lignin does inhibit the corrosion of mild steel by sulfuri c acid, and that the inhibition efficiency increased with lignin’s concentration.

Corrosion Inhibition Performance of Lignin Extracted from Black Liquor on Mild Steel in 0.5 M H2SO4 Acidic Media