Evaluation of environmentally friendly paints over bare steel using electrochemical techniques

Abstract

The protective characteristics and properties of various applications, be it single or multicoating, of bare steel with ecological paint have been studied using electrochemical techniques. Tests have been carried out with epoxy polyamine, epoxy amine and epoxy acrylic as undercoat and acrylic polyurethane and acrylic paint as second coat. It was found that the best system was a single coat of epoxy amine. A single coat of acrylic polyurethane (50 μ m) is not sufficient to protect the substrate efficiently and signs of corrosion are to be observed under the substrate from the initial moments of immersion onwards. The Nyquist profiles obtained from the EIS measurements are an excellent fit to a parallel equivalent circuit R(R(C(RC))).