Resumen de Comportamiento mecánico de capa de zinc sobre acero al variar calidad superficial y velocidad de enfriamiento

Juan Chico Chamorro, Carlos Wime Diaz Campoverde, Patricia Proaño Sánchez

• español

  La corrosión del acero estructural es un problema recurrente en nuestro país, llegando a afectar a muchas edificaciones, y la forma como se aplica el revestimiento protector de zinc es la principal causa. El presente estudio analiza el comportamiento mecánico adhesivo de la capa protectora depositada sobre acero estructural, variando la calidad superficial y la velocidad de enfriamiento del recubrimiento, los datos obtenidos en este estudio servirán para corregir o mejorar la forma de aplicación de este recubrimiento.

• English

  The corrosion of structural steel is a recurrent problem in Ecuador, affecting many buildings, and the way in which the zinc protective coating is applied is the main cause. The present study analyzes the adhesive mechanical behavior of the protective layer deposited on structural steel, varying the surface quality and cooling rate of the coating. The applied methodology consists of characterizing the raw material (structural profiles of angular type), applying surface pre-treatments to the angular profiles by polishing, sanding, grinding and as it comes from the factory, galvanizing the angular profiles in companies A and B, measuring the layer of galvanizing, identify and measure the thickness of the phases, measure surface roughness, quantify hardness of the zeta phase, and finally, measure the adhesiveness of the coating to the substrate. From the results obtained it can be seen that the roughness allows a better anchorage of the zinc layer to the metallic surface, the high cooling speeds allow to obtain a zinc layer with more brightness, greater hardness and adherence, although it sacrifices the ductility of the layer of coating when having a more fragile behavior. The presence of defects in the phases formed by the zinc influences the mechanical behavior during the pull-off test, since it can break the substrate when it is released from the steel surface. The high thicknesses of the zinc layer give the steel a longer life and resistance to corrosion. The data obtained in this study serve to correct or improve the application form of this coating.