The level of efficiency and protection against corrosion of an inhibitor depends on its interaction with the reinforcement. Taking into account this assumption, in present paper, the corrosion inhibition efficiency of Ferrogard 903 has been studied following two procedures: immersion of the rebar in the commercialised solution containing the corrosion inhibitor blend, before being introduced in the aggressive media; and addition of the corrosion inhibitor directly to the media with or without a previous presence of oxides on the reinforcement's surface. The study has been developed in systems simplifying the aqueous phase of the concrete pores: alkaline solutions polluted with chlorides and neutral solutions. The inhibition mechanism seems to be related with the mixed composition of the corrosion inhibitor whose behaviour depends on the exposure environment, on the inhibitor's method of application and on the surface state of the rebar.
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