Abstract
This work search introduce of a new alternative of organic coating without the presence of hazardous metals and replacement of commercial rectifiers used for protection of oxidized metals by the method of anodic protection. From this, was produced of a Smart Paint (SP), basically composed of a Paint Polyurethane Commercial (PPC) mixed with a 1% of binder de base PAni EB and plasticizer chemically inert 4chloro-3-methylphenol. After, the SP and PPC were applied in plates of carbon steel, with the use of dip coat technique. SP was characterized by thermal analyzes and physicochemical beyond perform electrochemical tests of Cyclic Voltammetry (CV) and Open Circuit Potential (OCP), in aqueous solution 2 mol.L H2SO4. The results obtained allow us to state that the application of the binder to the PPC not significantly alters their physicochemical properties, and that the binder adds the ability to induce the formation or maintenance of protective oxides in oxidized metals exposed to harsh environments.
Highlights
The corrosion is a process spontaneous that occurs from chemical and/or electrochemical reactions of metal substrates or metallic compounds exposed to electrolytic environments, which results in a change of the metallic structure for a chemical conformation of smaller reactivity
The temperature interval 201 to 500 ° C the binder PAni EB presented a weight loss of 19.19%, result that corresponds the total loss of plasticizer and structural degradation of the polymeric chains of the intrinsically conductive polymers (ICP), the Paint Polyurethane Commercial (PPC) and Smart Paint (SP) presented weight losses of approximately 42%, respectively, the which can be associated with structural changes of the polymer forming of the resin with degradation of urethane groups and/or structural degradation associated with the ICP, because the variations of weight loss SP are according with the results obtained by the film PAni. (Alves et al, 2010; Chattopadhyay et al, 2009)
From the thermograms obtained by Thermogravimetric Analysis (TGA), it was possible to identify the low physicochemical or nonexistent interaction of binder PAni EB to PPC in order to form the SP, because despite of the concentration low (1%), the results presented were consistent, mainly in the temperature range 201 to 500 °C, in which the components (PAni EB and CMP) of binder, that form the SP, are practically removed or degraded, represented on the increase and decrease of weight losses of SP according to the weight loss of binder PAni EB film
Summary
The corrosion is a process spontaneous that occurs from chemical and/or electrochemical reactions of metal substrates or metallic compounds exposed to electrolytic environments, which results in a change of the metallic structure for a chemical conformation of smaller reactivity. The second method occur by the production a coating constituted of elements (pigments or resins) that a provide specific protection (cathodic or anodic protection) to the substrate metallic. This protection method has the disadvantage of have been consolidated from the incorporation of dangerous metals (Cd, Pb, Cr, Ni and others) for formation of anticorrosive organic coatings, which represented a new demand of research that search to develop or aggregate new elements that would constitute the organic coatings form active against corrosion and at the same time, providing the lowest possible environmental impact (Amo et al, 2002; Wicks Jr. et al, 2007)
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