Influence of pH on the nitrite corrosion inhibition of reinforcing steel in simulated concrete pore solution
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2011Materia/s Unesco
3305.05 Tecnología del Hormigón
3328.16 Transferencia de Calor
3305.90 Transmisión de Calor en la Edificación
3303.07 Tecnología de la Corrosión
3312.08 Propiedades de Los Materiales
Resumen
Measurements of corrosion rate of reinforcing steels have been carried out in solutions simulating electrolytic chloride environments in corrosion pits in the propagation period with sodium nitrite. A significant corrosion inhibition has been observed at relatively low chloride contents of 0.045M due to the presence of nitrite in these systems, but its efficiency decreases when the pH is reduced. The corrosion intensity seems to be related to the Cl-]/OH-] ratio. Three different pH regions from acid to alkaline have been observed in terms of corrosion activity. An explanation on the behaviour of nitrite at different pH is given. © 2011 Elsevier Ltd.
Measurements of corrosion rate of reinforcing steels have been carried out in solutions simulating electrolytic chloride environments in corrosion pits in the propagation period with sodium nitrite. A significant corrosion inhibition has been observed at relatively low chloride contents of 0.045M due to the presence of nitrite in these systems, but its efficiency decreases when the pH is reduced. The corrosion intensity seems to be related to the Cl-]/OH-] ratio. Three different pH regions from acid to alkaline have been observed in terms of corrosion activity. An explanation on the behaviour of nitrite at different pH is given. © 2011 Elsevier Ltd.
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