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Corrosion Inhibition by Potassium Chromate-Zn2 System for Mild Steel in Simulated Concrete Pore Solution

Author Affiliations

  • 1 Corrosion Research Centre, PG and Research, Department of Chemistry, GTN Arts College, Dindigul- 624005, Tamil Nadu, INDIA
  • 2 Corrosion Research Centre, Department of Chemistry, RVS School of Engineering and Technology, Dindigul- 624005, Tamil Nadu, INDIA
  • 3 Department of EEE, PSNA College of Engineering and Technology, Dindigul-624 622, Tamil Nadu, INDIA

Res.J.chem.sci., Volume 4, Issue (2), Pages 49-55, February,18 (2014)


The inhibition efficiency (IE) of potassium chromate -Zn2+system in controlling corrosion of mild steel immersed in simulated concrete pore solution SCPS prepared in well water has been evaluated by weight loss method. The formulation consisting of 100 ppm of K2CrO4 and 50 ppm of Zn2+ provides 98% of IE. FTIR spectra reveal that the protective film consists of Fe2+ - chromate complex and Zn(OH). Polarization study confirms the formation of a protective film on the metal surface .AC impedance spectra also revealed that a protective film formed on the metal surface. The inhibitor system controls the anodic reaction predominantly. The reactions are diffusion controlled process.


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