Corrosion Inhibition and Adsorption Properties of Methocarbamol on Mild Steel in Acidic Medium

 

E.E. Ebenso,^1,* N.O. Eddy,² A.O. Odiongenyi³

 

      ¹Department of Chemistry and Chemical Technology, National University of Lesotho, P.O.Roma 180, Lesotho, Southern Africa

²Department of Chemistry, Ahmadu Bello University, Zaria, Kaduna State, Nigeria

        ³ Department of Chemistry, Michael Okpara University, Umudike, Nigeria

 

Received 28 August 2008; accepted 16 September 2008

 

 

Abstract

The corrosion inhibition of mild steel in H₂SO₄ in the presence of methocarbamol was studied using thermometric and gasometric (hydrogen evolution) methods. The study revealed that the corrosion rate increases with temperature, time and concentration of H₂SO₄. Addition of methocarbamol to the corrodent solution lowered the corrosion rate of mild steel. Inhibition efficiency (%I) of methocarbamol was found to increase with concentration and decreased with temperature. Adsorption of methocarbamol molecule on mild steel surface was found to obey the Langmuir adsorption isotherm. The phenomenon of physical adsorption is proposed from the obtained thermodynamic parameters.

Keywords: corrosion inhibition, mild steel, adsorption, methocarbamol.

 

 

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* Corresponding author. E-mail address: eno_ebenso@yahoo.com, ee.ebenso@nul.ls