Efecto del tratamiento de sellado en el comportamiento frente a corrosión de la aleación anodizada de aluminio-litio AA2099

Pedro  Samaniego-Gámez; Facundo  Almeraya-Calderón; Ulises  Martin; Jacob  Ress; Citlalli  Gaona-Tiburcio; Luis  Silva-Vidaurri; José  Cabral-Miramontes; José M.  Bastidas; José G.  Chacón-Nava; David M.  Bastidas

doi:10.3989/revmetalm.180

Authors

Pedro Samaniego-Gámez Universidad Autónoma de Nuevo León https://orcid.org/0000-0002-6660-4785
Facundo Almeraya-Calderón Universidad Autónoma de Nuevo León https://orcid.org/0000-0002-3014-2814
Ulises Martin National Center for Education and Research on Corrosion and Materials Performance, NCERCAMP-UA, Dept. Chemical, Biomolecular, and Corrosion Engineering, The University of Akron https://orcid.org/0000-0002-0657-5484
Jacob Ress National Center for Education and Research on Corrosion and Materials Performance, NCERCAMP-UA, Dept. Chemical, Biomolecular, and Corrosion Engineering, The University of Akron https://orcid.org/0000-0002-5702-931X
Citlalli Gaona-Tiburcio Universidad Autónoma de Nuevo León https://orcid.org/0000-0001-9072-3090
Luis Silva-Vidaurri Centro de Investigación en Materiales Avanzados (CIMAV) https://orcid.org/0000-0002-0210-4423
José Cabral-Miramontes Universidad Autónoma de Nuevo León https://orcid.org/0000-0003-1483-3081
José M. Bastidas National Center for Metallurgical Research (CENIM, CSIC) https://orcid.org/0000-0001-9616-0778
José G. Chacón-Nava Centro de Investigación en Materiales Avanzados (CIMAV) https://orcid.org/0000-0002-5131-0936
David M. Bastidas National Center for Education and Research on Corrosion and Materials Performance, NCERCAMP-UA, Dept. Chemical, Biomolecular, and Corrosion Engineering, The University of Akron https://orcid.org/0000-0002-8720-7500

DOI:

https://doi.org/10.3989/revmetalm.180

Keywords:

Aluminum-lithium AA2099 alloy, Anodizing, Corrosion, Electrochemical impedance, SEM, XPS

Abstract

The corrosion behavior of the sulphuric-anodized AA2099 using two different current densities, 0.19 or 1.0 A·cm⁻², with two different sealing treatments in H₂O and 6 wt.% Na₂Cr₂O₇ at 95 °C was studied in 3.5 wt.% NaCl and 10 vol.% H₂SO₄ solutions. The AA2099 is widely used in aeronautical applications, thus it is essential to present good corrosion performance in chloride and acid rain environments. The surface morphology of the anodized film was characterized by scanning electron microscopy (SEM), the electrochemical corrosion behavior was studied using electrochemical impedance (EIS), and finally characterization of the surface chemical composition was revealed by X-ray photoelectron spectroscopy (XPS). It was found the 6 wt.% Na₂Cr₂O₇ sealing treatment imparts a more homogeneous and compact passive layer, and tends to increase the charge transfer resistance, thus improving the corrosion behavior of the anodized AA2099.

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Author Biography

Citlalli Gaona-Tiburcio, Universidad Autónoma de Nuevo León

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