Pinturas pigmentadas con magnetita dopada: evaluación preliminar de propiedades anticorrosivas

  • Diana Marcela Escobar Universidad de Antioquia
  • Carlos Arroyave Universidad de Antioquia
  • Jorge Calderón Universidad de Antioquia
  • Isabel Margarit Universidad Federal de Río de Janeiro
  • Óscar Mattos Universidad Federal de Río de Janeiro
Keywords: Coatings, paints, impedance, magnetite, copper, chromium, corrosion

Abstract

Pure magnetite and magnetite doped with three different concentrations of chromium and copper was lab synthesized. The relative performance of these products as anticorrosive pigments is compared with commercially available hematite (red iron oxide). Special mixtures of the pigments with a solventless epoxy binder were prepared maintaining the pigment volume contents near the practical critical value. The purpose was to distinguish the inhibitive action of pigments with the least possible influence from the barrier properties of the epoxy resin. The performance of mixtures applied on mild steel is characterized in accelerated outdoor exposure, in alternated immersion tests and in total immersion conditions. The latter test was monitored with open circuit potential and impedance measurements. Complementary tests with freestanding films were also performed. The results show that magnetite is not an inert pigment. Therefore presence of doping elements can improve the performance of anticorrosive magnetite paints. Based on this result, a complete formulation with pigment, solvent and additives is suggested and preliminarily tested in the lab aiming at producing an anticorrosive primer.

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Author Biographies

Diana Marcela Escobar, Universidad de Antioquia

Grupo de Corrosión y Protección

Carlos Arroyave, Universidad de Antioquia

Grupo de Corrosión y Protección

Jorge Calderón, Universidad de Antioquia

Grupo de Corrosión y Protección

Isabel Margarit, Universidad Federal de Río de Janeiro

Laboratorio de Corrosión Prof. Manuel de Castro

Óscar Mattos, Universidad Federal de Río de Janeiro

Laboratorio de Corrosión Prof. Manuel de Castro

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Published
2014-03-31
How to Cite
Escobar D. M., Arroyave C., Calderón J., Margarit I., & Mattos Óscar. (2014). Pinturas pigmentadas con magnetita dopada: evaluación preliminar de propiedades anticorrosivas. Revista Facultad De Ingeniería Universidad De Antioquia, (41), 21-30. Retrieved from https://revistas.udea.edu.co/index.php/ingenieria/article/view/19013