Metall. Res. Technol.
Volume 115, Number 2, 2018
|Number of page(s)||6|
|Published online||08 January 2018|
Development of MgOx–TiOx coatings for modulation of Mg corrosion resistance
Department of Mechanical Engineering, DICIS, Universidad de Guanajuato,
carretera Salamanca-Valle de Santiago km. 3.5 + 1.8,
Salamanca, Gto., Mexico
2 Department of Agricultural Mechanical Engineering, DICIVA, Universidad de Guanajuato, ex Hacienda el Copal carretera Irapuato-Silao km. 9, 36500 Irapuato, Gto., Mexico
3 CICATA-Legaria, Instituto Politécnico Nacional, Calzada Legaria 694, Col. Irrigación, 11500 Ciudad de México, Mexico
4 Applied Physics Department, CINVESTAV-IPN, Antigua Carretera a Progreso km. 6, Cordemex, Loma Bonita Xcumpich, 97310 Mérida, Yuc., Mexico
* email: email@example.com
Accepted: 19 October 2017
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.
Key words: magnesium / corrosion / protective coating / MgOx / TiOx
© EDP Sciences, 2017
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