Synergistic Effect of Potassium Iodide with Cassia italica Extract on the Corrosion Inhibition of Carbon Steel Used in Cooling Water Systems in 0.5 M H2SO4

  • Abd El-Aziz S. Fouda
  • Hisham H. Al-Zehry
  • M. Elsayed


The inhibiting action of Cassia italica on the decay of carbon steel (CS) used in cooling towers in 0.5 M sulphuric acid has been examined by gravimetric method, and electrochemical techniques in addition to surface characterization by different techniques. The inhibition efficiency (%IE) increases with the increase in dose of extract and the temperature. The adsorption of this plant extract on the CS follows the Langmuir adsorption isotherm. Potentiodynamic polarization signified that extract behaves as mixed-type inhibitor. Potassium iodide (KI) was added to extract solution in order to increase (%IE) by synergistic effect between metal surface and extract component. Microbiology activity was also carried out to revise the effect of plant extract on bacteria growth in cooling tower.


Corrosion inhibition Acid cleaning Cooling tower Plant extract Synergism 


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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemistry, Faculty of ScienceEl-Mansoura UniversityEl-MansouraEgypt
  2. 2.Al-Qunfudah College of MedicineUmm Al-Qura UniversityMeccaKingdom of Saudi Arabia

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