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Evaluation of an environmentally friendly anticorrosive pigment for alkyd primer
Martí Barroso, Mireia; Fabregat Jové, Georgina; Azambuja, Denise S.; Alemán Llansó, Carlos; Armelín Diggroc, Elaine Aparecida
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química
An alkyd formulation containing zinc phosphate (10 wt.%) was prepared and subsequently modified replacing the latter anticorrosive additive by a very low concentration of conducting polymer. Specifically, three modified paints, which contain polyaniline emeraldine base (undoped form), polyaniline emeraldine salt (doped form) and an eco-friendly polythiophene derivative (partially oxidized), were formulated. The properties and corrosion resistance of the four alkyd coatings have been characterized. Among the three modified paints, the one containing polythiophene shows the best adherence and the highest corrosion resistance. This has been attributed to the fact that the miscibility of the polythiophene derivative with the alkyd formulation is better than that of polyaniline. Furthermore, accelerated corrosion assays and electrochemical impedance spectroscopy measurements revealed that the corrosion resistance of the paint with polythiophene is several orders of magnitude higher than that with zinc phosphate. The polythiophene derivative has been found to induce the formation of a passivating and well-adhered layer between the coating and the surface, preventing the access of chloride anions and oxygen to the substrate.
Àrees temàtiques de la UPC::Enginyeria química
Corrosion and anti-corrosives.
Alkyd primer
Corrosion resistance
Electrochemical impedance spectroscopy
Espectroscòpia d'impedància
Corrosió i anticorrosius
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