Examining the formation and properties of TiO2 oxide coatings with metals of iron triad

Authors

DOI:

https://doi.org/10.15587/1729-4061.2017.97550

Keywords:

catalyst, titanium oxides, oxide coatings, plasma-electrolytic oxidizing, catalytic activity

Abstract

We proposed a composition of citrate-pyrophosphate electrolytes with the addition of sulfates of iron triad metals for the formation of mixed oxide systems with the varied content of dopants. The introduction of an additional ligand contributes to an increase in the stability, operation period of working solutions and to the more uniform distribution of metals-dopants. The range of voltages for the single-stage plasma-electrolytic oxidizing of titanium alloys BT1-0 and OT4-1 is 120–160 V. As a result of oxidizing, we obtained metal-oxide systems TiOx·MOy (M=Fe, Co, Ni), which, depending on the nature of a dopant, have different types of surface structures. The largest content of dopant and the minimum size of the grain are characteristic of the cobalt-containing coatings. A potential possibility of obtaining the mixed oxide systems TiOx·(FeCoNi)Oy on the alloy OT4-1 is shown. We examined the dependences of spark voltage and the rate of change in the interelectrode voltage on the concentration of dopants in electrolyte. It was established that the formed mixed oxide coatings of titanium with the iron triad metals possess significant corrosion resistance; the highest value is inherent to the systems based on cobalt. It is shown that the incorporation of iron triad metals into the composition of oxide layers leads to an increase in the degree of surface development. This ensures an increase in the catalytic activity in the reactions of carbon mono-oxide oxidation. The obtained materials of varied thickness and morphology might be used in the technological systems of catalytic purification of natural and technogenic toxicants.

Author Biographies

Mykola Sakhnenko, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Doctor of Technical Sciences, Professor, Head of Department

Department of Physical Chemistry

Ann Karakurkchi, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD, Head of Research Laboratory

Research Laboratory Military Training Faculty

Alexander Galak, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD

Department of Physical Chemistry

Sergey Menshov, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Postgraduate student

Department of Physical Chemistry

Oleksii Matykin, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Postgraduate student

Department of Physical Chemistry

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Published

2017-04-26

How to Cite

Sakhnenko, M., Karakurkchi, A., Galak, A., Menshov, S., & Matykin, O. (2017). Examining the formation and properties of TiO2 oxide coatings with metals of iron triad. Eastern-European Journal of Enterprise Technologies, 2(11 (86), 4–10. https://doi.org/10.15587/1729-4061.2017.97550

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Section

Materials Science