Inhibition effect of potassium iodide on the corrosion of carbon steel (XC 38) in acidic medium

Authors

  • Tarik Attar 1 Laboratory of Analytical Chemistry and Electrochemistry, Department of chemistry, Faculty of sciences, University Abou-Bekr Belkaïd, Tlemcen 13000, Algeria. 2 University Center of Naama 4500, Algeria.
  • Lahcène Larabi Laboratory of Analytical Chemistry and Electrochemistry, Department of chemistry, Faculty of sciences,University Abou-Bekr Belkaïd, Tlemcen 13000, Algeria.
  • Yahia Harek Laboratory of Analytical Chemistry and Electrochemistry, Department of chemistry, Faculty of sciences,University Abou-Bekr Belkaïd, Tlemcen 13000, Algeria.

DOI:

https://doi.org/10.14419/ijac.v2i2.3272

Published:

2014-09-08

Abstract

The effect of potassium iodide (KI) on the corrosion of carbon steel (XC38) in 0.5 M H2SO4 has been investigated in relation to the con-centration of the inhibitor by weight loss measurement. It was found that the inhibition efficiency increases with an increase in concentration of inhibitors and temperature. The effect of temperature on the corrosion behavior with the addition of optimal concentration of KI was studied in the temperature range 293-323 K. The adsorption of the inhibitor on the XC38 surface is in agreement with Temkin adsorption isotherm. On the bases of thermodynamic adsorption parameters, it can be interpreted that the adsorption of this inhibitor on the carbon steel surface takes place through both chemical and physical adsorption.

Keywords: Corrosion Inhibition, Weight Loss, Carbon Steel, Adsorption Isotherm, Thermodynamic Parameters.

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