Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2015 Vol: 7 Issue: 10

Sodium nitrite as corrosion inhibitor for mild steel in simulated concrete pore solution


The corrosion inhibition effect of mild steel in si mulated concrete pore solution (SCPS) by Sodium N itrite and Zn 2+ has been investigated using weight loss method and cyclic voltammetry. The results show that 93% of i nhibition efficiency is achieved with binary system consistin g of 100 ppm of sodium nitrite – 50 ppm of Zn 2+ . Surface evaluation technique like FTIR is used to determi ne the nature of the protective film formed on the metal surface. The protective film consists of Fe 2+ - SN complex, Zn 2+ - SN complex and Zn(OH) 2 . Cyclic voltammetry study reveals that the protective film is more compact and stable even in 3.5% NaCl environment.