Corrosion Inhibition of Mild Steel in Acidic Medium by Methyl Red (2, 4-Dimethylamino-2'-carboxylazobenzene)

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Author(s) S.I. Durowaye | V.O. Durowaye | B.M. Begusa
Pages 469-475
Volume 4
Issue 8
Date August, 2014
Keywords Corrosion, Mild Steel, Methyl Red, H2SO4, Optical Emission Spectrometer


The inhibition of corrosion of mild steel in 1M H2SO4 solution at room temperature by methyl red (2, 4-Dimethylamino-2'-carboxylazobenzene), an organic compound was studied using the weight loss technique. The concentration of the methyl red was varied as 1.0%, 2.0%, 3.0%, 4.0%, 5.0% and 6% weight of each acidic medium and their effects were carefully studied on the corrosion rate of mild steel. The results obtained showed methyl red to be an efficient inhibitor in the acid environment with general decrease in corrosion rate as the concentration of the organic compound increases. The adsorption of the inhibitor on the mild steel obeys the Langmuir adsorption isotherm.

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