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Journal of Applied Electrochemistry

, Volume 39, Issue 1, pp 15–22 | Cite as

Role of alkaline nitrites in the corrosion performance of steel in composite cements

  • Ha-won Song
  • V. SaraswathyEmail author
  • S. Muralidharan
  • Chang-Hong Lee
  • K. Thangavel
Original Paper

Abstract

The influence of alkaline nitrites on the inhibition of corrosion of steel in binary and ternary cement environments was tested. pH measurements carried out for binary and ternary cement extracts showed that the alkalinity of the cement was not affected by making use of binary and ternary cements. Gravimetric measurements showed that the decrease in the corrosion rate of steel in different systems follows the order: Ternary > (OPC + PSC) > (OPC + PPC) > (PPC + PSC). Potential–time studies indicated that the ability to maintain the passivity of steel in different systems also follows the order as above. Potentiodynamic polarisation studies for steel in binary and ternary cement environments showed the favourable influence of the presence of higher amounts of chlorides. Nitrites of sodium, potassium and calcium act as anodic inhibitors and they compete with chloride ions for the ferrous ions at the steel to form a film of ferric oxide. An efficiency as high as 91% is obtained for the ternary system containing 1% chloride and 0.5% nitrite. The degree of surface coverage showed a maximum value for the ternary system (>0.9) even in the presence of a higher amount of chloride thereby indicating the better performance of the system.

Keywords

Composite cements Nitrites Corrosion Concrete Inhibitors 

Notes

Acknowledgements

The authors thank the Director, CECRI, Karaikudi for his kind permission to publish this article. The authors also gratefully acknowledge the support from Center for Concrete Corea, South Korea for financial assistance.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Ha-won Song
    • 1
  • V. Saraswathy
    • 2
    Email author
  • S. Muralidharan
    • 2
  • Chang-Hong Lee
    • 1
  • K. Thangavel
    • 2
  1. 1.School of Civil and Environmental EngineeringYonsei UniversitySeoulRepublic of Korea
  2. 2.Corrosion Protection DivisionCentral Electrochemical Research InstituteKaraikudiIndia

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