Abstract

APERADOR, William; VERA, Enrique  and  MILFRED IPAZ, Lonid. EFFECT OF CURRENT DENSITY ON MORPHOLOGY AND ELECTROCHEMICAL PROPERTIES IN POROUS ANODIC FILMS GROWN ON 2024-T3 ALUMINIUM ALLOYS. Rev.EIA.Esc.Ing.Antioq [online]. 2011, n.15, pp.9-19. ISSN 1794-1237.

This 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.

Keywords : Aluminium alloys 2024-T3; anodic films; atomic force microscopy; scattering electronic microscopy; electrochemical impedance spectroscopy; Tafel polarization curves.

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