Examinando por Autor "Aperador, W. (William)"
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Publicación Acceso abierto Efecto de la densidad de corriente sobre la morfología y las propiedades electroquímicas en películas anódicas porosas, crecidas sobre AA 2024-T3(2013-11-18) Aperador, W. (William); Vera, Enrique E.; Ipaz, Leoníd MilfredThis paper reports the results of a study about the corrosion electrochemical properties of the porous anodic films grown on aluminium alloys 2024 T3, obtained by DC technique at current densities of 10, 15 and 20 mA/cm2 in an aqueous solution of H2SO4. Materials characterization was carried out using atomic force microscopy (AFM) allowing identify that the increase in the current density produces a greater surface homogeneity and a decrease of average surface roughness. The micro-hardness Vickers measurements determined that the hard anodization layer improves their mechanical resistance related to the substrate. To evaluate the corrosion resistance of the anodic films, the EIS technique and Tafel polarization curves were employed. From these techniques it has been determined that the increase in the current density values forms films that increase the corrosion resistance. In addition the electrochemical behavior of the obtained films was modeled and the correlation with the images obtained by scattering electron microscopy (SEM) was made.Publicación Acceso abierto Resistencia al desgaste erosivo-corrosivo de aceros austeníticos fermanal(2013-11-05) Aperador, W. (William); Bautista, J. H. (Jorge Hernando); Betancur, J. D. (Juan David)We obtained austenitic alloys of the Fe-Mn-Al, Fe in the range (4.9~11.0 wt% Al) - (17.49~34.3 wt% Mn) -(0, 43 ~ 1.25 wt% C), which were melted in an induction furnace from high purity materials. The alloys were evaluated with respect to corrosion, wet erosion and corrosion-erosion at an impact angle of 90°. For the evaluation of corrosion a solution composed of 0.5 M NaCl and silica particles with size between 210 to 300 microns was used in order to analyze the effect of aluminum and manganese content in the resistance to erosion and corrosion-erosion of these alloys. To characterize the corrosion, response technique was used by potentiodynamic polarization curves and using the same technique as Tafel extrapolation, the microstructural characterization by scanning electron microscopy (SEM), and the composition of corrosion products were analyzed using diffraction of X-rays (XRD).