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Corrosion Performance of Anodized AZ91D Magnesium Alloy: Effect of the Anodizing Potential on the Film Structure and Corrosion Behavior

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Abstract

Die-cast AZ91D magnesium alloy samples have been submitted for anodizing at different potentials. Anodizing was conducted in an environmentally friendly solution which comprised 3 M KOH + 1 M Na2SiO3 at room temperature. The surface treatment was performed electrolytically at four different potentials: 3, 5, 8, and 10 V. The corrosion resistance was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization curves obtained after 7 days of immersion in a 3.5 wt.% NaCl solution at room temperature. The porosity of the anodic films was estimated by means of the linear polarization method. SEM images revealed that the surface oxide was thicker for the anodic films obtained at 3 and 5 V. The films obtained at these potentials were more porous than those formed at 8 and 10 V. The results showed that the thickness of the anodic film had a significant effect on the corrosion behavior of the AZ91D, whereas the influence of the initial porosity was not significant.

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Acknowledgments

The authors are thankful to Rima Industrial S/A for kindly providing the material used in this work.

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Authors and Affiliations

  1. Electrocell Ind. Com. Equip. Elet., LTDA, Technology, Entrepreneurship and Innovation Center (CIETEC), São Paulo, SP, CEP 05508-000, Brazil

    Mara Cristina Lopes de Oliveira

  2. Engineering, Modeling and Applied Social Sciences Center (CECS), Federal University of ABC (UFABC), Santo André, SP, CEP 09210-580, Brazil

    Viviam Serra Marques Pereira & Renato Altobelli Antunes

  3. IPEN/CNEN-SP, Av. Prof. Lineu Prestes 2242, São Paulo, SP, CEP 05508-900, Brazil

    Olandir Vercino Correa

Authors
  1. Mara Cristina Lopes de Oliveira
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  4. Renato Altobelli Antunes
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Correspondence to Renato Altobelli Antunes.

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de Oliveira, M.C.L., Pereira, V.S.M., Correa, O.V. et al. Corrosion Performance of Anodized AZ91D Magnesium Alloy: Effect of the Anodizing Potential on the Film Structure and Corrosion Behavior. J. of Materi Eng and Perform 23, 593–603 (2014). https://doi.org/10.1007/s11665-013-0755-0

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