Vanadium carbide coatings produced on gray cast iron using the thermo-reactive deposition/diffusion technique
Resumen
Recubrimientos duros de Carburo de Vanadio (VC) fueron producidos sobre fundición de hierro gris (GCI) con matriz perlítica, grafitos laminares distribuidos aleatoriamente y 3,5% de carbono total. El proceso se realizó en un baño de sales de bórax, fundido a temperaturas de 1173 K, 1223 K y 1273 K, para 2, 4 y 6 horas. Se usó ferro Vanadio como elemento formador de los carburos y aluminio como agente reductor. A partir de la Teoría Cinética Clásica se determinaron los parámetros de crecimiento de capa.Los recubrimientos obtenidos se caracterizaron por microscopia electrónica de barrido (SEM), espectroscopia de electrones Auger (AES) y difracción de rayos X (DRX). En general se logró producir un recubrimiento de morfología compacta, continua, homogénea y de una interface lisa. A partir de DRX se observó la fase FCC del VC con una orientación mixta en los planos (111) y (200). A partir de AES se verificó la presencia de Vanadio a 437 eV y carbono a 272 eV. Finalmente se encontró mediante técnicas electroquímicas de polarización potenciodinámica en solución de NaCl al 3%, la resistencia a la corrosión del sistema VC-fundición gris presento mejor comportamiento con respecto al sustrato.
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