Sodium Nitrite-based Corrosion Inhibitor for Reinforcing Steel in Simulated Polluted Concrete Pore Solutions

Abstract

Corrosion behavior of reinforcing steel in the simulated polluted concrete pore (SPCP) solutions and the inhibition effect of NaNO 2 and D-sodium gluconate on the steel corrosion were studied by polarization curve measurements and electrochemical impedance spectroscopy (EIS). The results indicated that the compound inhibitor contained 5 g L -1 NaNO 2 and 0.01 M D-sodium gluconate could produce a strong inhibition effect for the steel in the solution with pH 11.00 and 3.5% NaCl, and its inhibition efficiency reached about 99.0%. The compound inhibitor mainly acted as an anodic corrosion inhibitor, and had an obvious synergistic effect on the corrosion inhibition of reinforcing steel.

Cymbopogon citratusand NaNO2Behaviours in 3.5% NaCl-Immersed Steel-Reinforced Concrete: Implications for Eco-Friendly Corrosion Inhibitor Applications for Steel in Concrete

“…Sodium nitrite (NaNO 2 ) is a compound that had exhibited high effectiveness, in the literature, at inhibiting reinforcing-steel corrosion in chloride-contaminated environment [34,35,43,44]. The high effectiveness of NaNO 2 at inhibiting reinforcing-steel corrosion in diverse environments has made it suitable for use in comparative study on other corrosion inhibiting prospects for carbon steel/steel in concrete, especially substances that could exhibit better environmental compatibility [27,[45][46][47].…”