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Electrochemical assessment of magnetite anticorrosive paints

By D. M. Escobar, C. Arroyave, F. Jaramillo, O. R. Mattos, I. C. Margarit and J. Calderón

Abstract

With the purpose of deepening in the understanding of the mechanisms of protection of anticorrosive pigments based on iron oxides, this work has been carried out on the production of pure magnetite, and copper and chromium doped magnetite, which were evaluated by different characterization techniques. The paints were prepared with a solvent less epoxy resin maintaining the Pigment Volume Content near the Practical Critical value (CPVC), established for each pigment. The paints were applied on polished steel and monitored with electrochemical techniques at total immersion conditions. Permeability and impedance measurements of free films were also done. Impedance data were simulated with the Boukamp software. Results show that the paints pigmented with doped magnetite present better behavior than a paint prepared with commercial hematite.<br><br>Con el propósito de profundizar en el entendimiento de los mecanismos de protección de los pigmentos anticorrosivos a base de óxidos de hierro, se sintetizaron y caracterizaron magnetitas puras y dopadas con cobre y cromo, con las cuales se prepararon pinturas anticorrosivas que fueron evaluadas en ensayos acelerados de campo y laboratorio. Las pinturas fueron especialmente preparadas con una resina libre de solvente manteniendo la Concentración Pigmentaria en Volumen cercana al valor Crítico (CPVC), establecida para cada pigmento. Las pinturas fueron aplicadas sobre acero pulido y evaluadas con técnicas electroquímicas en condiciones de inmersión total. Para complementar el estudio se realizaron medidas de permeabilidad e impedancia sobre las películas libres. Los datos de impedancia se simularon con el programa Boukamp. Los resultados muestran que las pinturas pigmentadas con magnetitas dopadas presentan mejor comportamiento que las preparadas con hematita comercial

Topics: Anticorrosive paints, Doped magnetite, Hematite, Permeability, Impedance, Pinturas anticorrosivas, Magnetitas dopadas, Hematita, Permeabilidad, Impedancia, Mining engineering. Metallurgy, TN1-997, Technology, T, DOAJ:Mining and Metallurgy, DOAJ:Technology and Engineering
Publisher: Consejo Superior de Investigaciones Científicas
Year: 2003
OAI identifier: oai:doaj.org/article:aad2c91cec9e4d7594bd1567019c9d93
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