Effectiveness conditions of sodium monofluorophosphate as a corrosion inhibitor for concrete reinforcements

Among the array of protection and repair methods for reinforced concrete structures when steel reinforcements undergo corrosion, the use of migrating corrosion inhibitors could prove to be an attractive alternative. These products, applied to the concrete surface, are intended to diffuse into the concrete in order to reach the reinforcement and stop or delay corrosion. Some key aspects on the use of monofluorophosphate (MFP) as an inhibitor for concrete reinforcements are presented first. The experimental work has focused on developing a method to determine the amount of MFP in concrete and on studying the chemical interactions taking place between MFP and certain concrete components. These data are then used to explain MFP penetration profiles in concretes as well as the correlation with electrochemical measurements.