Potassium Iodide as a Corrosion Inhibitor of Mild Steel in Hydrochloric Acid: Kinetics and Mathematical Studies

  • Anees A. Khadom
  • Ahmed N. Abd
  • Nagham Arif Ahmed


Corrosion inhibition of mild steel in 1 M HCl was investigated in the absence and presence of potassium iodide (KI) as a corrosion inhibitor. The effects of temperature and inhibitor concentration were studied using weight loss technique. The result obtained shown that KI act as an inhibitor for mild steel in HCl and decreases the corrosion rate. The inhibition performance was found to increases with increase in inhibitor concentration and temperature. Higher inhibition efficiency was 94% at higher level of inhibitor concentration and temperature. The adsorption of KI on mild steel surface was found to fellow Langmuir adsorption isotherm. The values of the free energy of adsorption were between − 20 and − 40 kJ/mol that is indication of mixed mode of physical and chemical adsorption. Mathematical models were also suggested to correlate the corrosion rate data with independent variables.


Corrosion Inhibitor Mild steel Acid Adsorption Mathematical models Regression 



The authors would like to thank University of Diyala, Iraq, for continuous support.

Compliance with Ethical Standards

Conflict of interest

There are no conflicts of interest arising from the involvement of other parties either internal or external to the University.


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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemical Engineering, College of EngineeringUniversity of DiyalaBaqubahIraq
  2. 2.Department of Chemistry, College of ScienceUniversity of DiyalaBaqubahIraq

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