Nanotech 2010

An experimental and theoretical study of the inhibition mechanism of organic substances in concrete

M.V. Diamanti, M. Ormellese, E.A. Perez-Rosales, MP. Pedeferri, G. Raffaini, F. Ganazzoli
Politecnico di Milano, IT

Keywords: passive films, inhibition mechanism, localized corrosion

Abstract:

Corrosion inhibitors are one of the preventative techniques used to prevent chloride-induced corrosion in reinforced concrete structures. Several commercial inhibitors are available on the market, but their efficiency as well as their inhibitive mechanism are not well understood. In this paper the inhibiting behaviour of five nano-sized organic substances in delaying chloride-induced corrosion was evaluated in alkaline solution using electrochemical impedance spectroscopy and potentiodynamic tests. Experimental and theoretical results confirmed both the presence of a strong physisorption between the inhibitors and the substrate, and of repulsive interactions between the molecules of inhibitors, leading to the formation of a non-homogenous monolayer, i.e. a nanometric layer of inhibitor molecules scattered across the surface.
 
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