The addition of nanostructured VC particles in coatings WC-Co improves the mechanical properties of cermet processed by the thermal spray technique HVOF. These coatings are used to protect components from wear, high temperature and corrosion. In the other hand these coatings are an alternative to replace chrome plating in aerospace industry. The objective was study the corrosion resistance of bimodal coatings WC-Co-VC applied by thermal spray HVOF with different concentration of VC on AISI 304. Bimodal mixtures were obtained from commercial micro and nanostructured powders. Then it was deposited on AISI 304 using a HVOF hybrid gun and robotized arm. The electrochemical characterization was performed by polarization resistance and potentiodynamic polarization curves. It was determined that the anodic polarization curves the coatings present a tendency to passivation; however, they were more pronounced in sodium hydroxide. Addition of nanostructured VC particles to the cermet WC-12Co didn't affect its corrosion resistance.

En el presente trabajo se realizó una evalución de la preparación superficial de sustratos metálicos con chorro de alumina (sandblasting SB) y mediante el uso de herramientas de corte (HC) sobre aceros inoxidable AISI 304 para después aplicar un recubrimiento por APS. Se utilizo la estacion de rugosidad de la Universidad Nacional de Colombia Sede Medellin con el apoyo del grupo GTS de superficies, para analizar la textura y asi comparar los perfiles de rugosidad y sus respetivos parametros de rugocidad tomando de referencia los parametros más usados en contexto metalmecanico nacional. Como resultado de ejecutar ambas tecnicas sobre inoxidable 304, se evidencio que existe un efecto significativo en la activacion superficial cuando se combinan el sandblasting y los procesos de mecanizado para activar la superficie ya que la componente polar de energia libre disminuye de manera significativa al aumentar las variables de rugosidad.