Effect of Nitrite Concentration and pH on Steel Corrosion Induced by Sulfate in Simulated Concrete Pore Environment

Abstract:

The effect of nitrite on steel corrosion induced by sulfate in three simulated concrete pore environments has been investigated by means of half-cell potential, linear polarization resistance and visual examination, as well as sulfate-induced corrosion is compared with chloride-induced corrosion. The results indicate that with the presence of nitrite, sulfate-induced corrosion can be inhibited effectively. Sulfate threshold level increases with the increasing of nitrite concentration and highly alkaline environment plays an important role in assisting nitrite to inhibit sulfate-induced corrosion. Chloride-induced corrosion is more prone to initiate than sulfate-induced corrosion in highly alkaline environment but in neutral environment, when nitrite content is equal to or less than 0.053mol/L, sulfate-induced corrosion is more likely to occur than chloride-induced corrosion.

• Periodical: Applied Mechanics and Materials (Volumes 368-370)
• Pages: 911-918
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.368-370.911
• Online since: August 2013
• Authors: Zhong Lu Cao, Makoto Hibino, Hiroki Goda
• Keywords: Inhibiting Efficiency, Nitrite, pH Environment, Steel Corrosion, Sulfate

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DOI: 10.1016/0008-8846(88)90102-0