Corrosion inhibition of carbon steel in perchloric acid by potassium iodide


  • Tarik Attar Superior School of Applied Sciences of Tlemcen, BP 165, 13000 Bel Horizon, Tlemcen, Algeria
  • Abbes Benchadli Laboratory Toxicomed, University Abou Beker Belkaid Tlemcen, BP119, 13000 Tlemcen, Algeria
  • Esma Choukchou-Braham Laboratory Toxicomed, University Abou Beker Belkaid Tlemcen, BP119, 13000 Tlemcen, Algeria





Corrosion Inhibition, Carbon Steel, Potassium Iodide, Weight Loss, Adsorption Isotherm.


Corrosion processes are responsible for numerous losses mainly in the industrial scope. It is clear that the best way to combat it is pre-vention. The effect of temperature on the corrosion behavior of carbon steel was studied by mass loss measurements in the temperature range 293–333 K. The inhibition efficiency increases with increasing temperature. The inhibitor showed 97.98 % inhibition efficiency at 1.10-3 M concentration of iodide potassium in 1 M perchloric acid solutions. The values of activation energy (Ea), enthalpy of activation (ΔHa) and entropy of activation (ΔSa), free energy of adsorption (ΔGads), enthalpy of adsorption (ΔHads) and entropy of adsorption (ΔSads) were calculated. The adsorption of this inhibitor on carbon steel surface obeys Langmuir adsorption isotherm.




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