Influence of tramadol [2-[(dimethylamino)methyl]-1-(3-methoxyphenyl) cyclohexanol hydrate] on corrosion inhibition of mild steel in acidic media |
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Authors: | R A Prabhu A V Shanbhag T V Venkatesha |
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Affiliation: | (1) Department of Chemistry, M.G.C. Arts, Commerce and G.H.D. Science College, Siddapur (U.K.), Karnataka, India;(2) Department of Chemistry, S.D.M. College, Honnavar (U.K.), Karnataka, India;(3) Department of P.G. Studies and Research in Chemistry, Kuvempu University, Shankaraghatta, 577 451, Karnataka, India |
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Abstract: | Tramadol2-(dimethylamino)methyl]-1-(3-methoxyphenyl)cyclohexanol hydrate], a drug, was tested as a corrosion inhibitor for
mild steel in 0.5 M HCl and 0.25 M H2SO4 separately at 300, 310 and 320 K using mass loss and galvanostatic polarization techniques. The percentage protection efficiencies
were evaluated at different concentrations of the inhibitor at different temperatures. The protection efficiency increased
with increase in inhibitor concentration and decreased with increase in temperature in both the acid solutions. Galvanostatic
polarization studies showed that the inhibitor is of mixed type with a slight predominance of cathodic character. The inhibitor
was more active in HCl than in H2SO4. The maximum protection efficiency approached 82.6% in the presence of 2.16 × 10−3 M inhibitor. Some samples of mild steel were examined by scanning electron microscopy. The inhibitor was found to adsorb
on the mild steel surface according to the Langmuir adsorption isotherm. The thermodynamic functions of dissolution and adsorption
processes were evaluated. |
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Keywords: | Acidic media Adsorption Corrosion Inhibition Mild steel Tramadol |
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