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.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites
Published: June 21, 2010
Pages: 689 - 692
Industry sector: Advanced Materials & Manufacturing
Topics: Advanced Materials for Engineering Applications, Coatings, Surfaces & Membranes