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Mechanical and Corrosion Behavior of Plasma Electrolytic Oxidation Coatings on AZ31B Mg Alloy Reinforced with Multiwalled Carbon Nanotubes

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Abstract

Plasma electrolytic oxidation (PEO) is an effective surface modification technique. The PEO technique has been widely used to grow protective oxide layers into materials with lower corrosion resistance properties. In this study, a new technique was used for synthesizing AZ31B magnesium alloy reinforced with multiwalled carbon nanotubes (MWCNTs). After the synthesis, the composites were coated by PEO in a solution of sodium metasilicate pentahydrate (Na2SiO3·5H2O) and potassium hydroxide (KOH). The microstructure morphology and composition in the interface were characterized by scanning electron microscopy and energy-dispersive x-ray spectroscopy. The hardness, the elastic modulus and adherence of the coatings were studied by nanoindentation tests. Finally, the samples were subjected to corrosion tests by electrochemical impedance spectroscopy. The microstructure and mechanical analysis shows that the PEO coating morphology has a dependency on the MWCNTs content into the metal matrix and exhibited good mechanical properties and high corrosion resistance.

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Acknowledgments

The authors thank Universidad Nacional de Colombia at Medellín, Centro de Investigación en Materiales Avanzados (CIMAV-Mexico) and Institución Universitaria Pascual Bravo for the financial support with the research ‘Desarrollo de materiales metálicos livianos nano-reforzados por medio de técnicas alternativas.’ JMHR thanks to CONACYT-Red Temática de Nanociencias y Nanotecnología and Red Temática de Ciencia y Tecnología del Espacio.

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Authors and Affiliations

  1. Facultad de Ingeniería, Grupo GIIEN, Institución Universitaria Pascual Bravo, Cl 73 No. 73 A 226, 050034, Medellín, Colombia

    Cesar A. Isaza M. & Juan S. Rudas

  2. Departamento de Materiales y Minerales, Facultad de Minas, Design of Advanced Composites- DADCOMP, Universidad Nacional de Colombia, Cl 75 No. 79A 51, 050032, Medellín, Colombia

    Benjamín Zuluaga D., Hugo A. Estupiñán D. & Juan M. Meza

  3. Laboratorio Nacional de Nanotecnología, Centro de Investigación en Materiales Avanzados (CIMAV), Miguel de Cervantes 120, 31136, Chihuahua, Chih, Mexico

    José M. Herrera R.

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  1. Cesar A. Isaza M.
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Isaza M., C.A., Zuluaga D., B., Rudas, J.S. et al. Mechanical and Corrosion Behavior of Plasma Electrolytic Oxidation Coatings on AZ31B Mg Alloy Reinforced with Multiwalled Carbon Nanotubes. J. of Materi Eng and Perform 29, 1135–1145 (2020). https://doi.org/10.1007/s11665-020-04633-z

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  • DOI: https://doi.org/10.1007/s11665-020-04633-z

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