Volume 7, 2020
|Number of page(s)||6|
|Published online||24 December 2020|
Hydrothermal synthesis of ZnTa2O6, ZnNb2O6, MgTa2O6 and MgNb2O6 pseudo-binary oxide nanomaterials with anticorrosive properties
National Institute for Research and Development in Electrochemistry and Condensed Matter, 1 Plautius Andronescu Street, Timisoara 300224, Romania
2 “Coriolan Drăgulescu” Institute of Chemistry of the Romanian Academy, 24 M. Viteazul Ave., Timisoara 300223, Romania
Accepted: 30 November 2020
ZnTa2O6, ZnNb2O6, MgTa2O6 and MgNb2O6 pseudo-binary oxide nanomaterials were synthesized through the hydrothermal method at 250 °C. Obtained materials were characterized by X-ray diffraction, UV-VIS measurements, field emission-scanning electron microscopy and atomic force microscopy techniques. XRD results show that the single phases of ZnTa2O6, ZnNb2O6, MgTa2O6 and MgNb2O6 pseudo-binary oxides nanomaterials were obtained, no thermal treatment being required. The values for the optical band gap of each material are settled in the range 3.60–3.80 eV. The anticorrosion characteristics of the obtained compounds were also evaluated after deposition on carbon steel in 0.5 M Na2SO4 media by open circuit potential measurements and potentiodynamic polarization technique with Tafel representation. The inhibition efficiency of pseudo-binary oxides deposited on carbon steel electrode was in the range 37–59.17%, promising for improvement of the anticorrosion properties.
Key words: Oxides / hydrothermal / band gap / corrosion inhibition / tafel curves
© M. Birdeanu et al., Published by EDP Sciences 2020
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