Development of MgOx-TiOx coatings for modulation of Mg corrosion resistance

Eric Noé Hernández Rodríguez, Claudia Mariana Íñiguez Contreras, Alfredo Márquez Herrera, Martín Guadalupe Zapata Torres, Antonio Balvantín Gracía, José Angel Diosdado De La Peña, Ricardo Mis Fernández, Juan Luis Peña Chapa

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2 Scopus citations

Abstract

The development and testing of protective coatings against corrosion for magnesium is reported. The coatings were based on the MgOx-TiOx composite and for their fabrication the reactive RF-sputtering technique in the co-deposition mode was employed. MgOx-TiOx coatings with chemical composition ranging from pure Mg oxides to pure Ti oxides, including its mixture, were obtained through the variation of the rate of the sputtering powers applied to the Mg and Ti targets. Characterization (XRD and XPS) showed changes in the crystalline structure according to the rate of the sputtering powers and confirmed the presence of MgO2, MgO, Ti2O3 and TiO2 in different proportions. Electrochemical polarization measurements (Tafel) made by employing the Hank's solution showed that both Vcorr and Icorr depend on the chemical composition of the coatings, having better corrosion resistance when the content of Ti oxides is higher. Results showed that corrosion resistance of Mg could be modulated by changing the chemical composition of the MgOx-TiOx coatings.

Original languageEnglish
Article number205
JournalMetallurgical Research and Technology
Volume115
Issue number2
DOIs
StatePublished - 2018

Keywords

  • Corrosion
  • Magnesium
  • MgOx
  • Protective coating
  • TiOx

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