Add time:07/27/2019         Source:sciencedirect.com

The structure and the properties of the oxide films formed on titanium by means of plasma electrolytic oxidizing at direct current density of 1 – 5 A·dm−2 have been studied. Composition of citrate-pyrophosphate electrolytes with addition of iron triad metals’ sulfates were proposed for the formation of mixed oxide systems with the varied content of dopants. The range of voltages for the single-stage plasma-electrolytic oxidizing of titanium alloys VT1-0 and OT4-1 is of 120–160 V, and operating voltage decreases with rising concentration of dopant ions. As a result of oxidizing, metal-oxide systems TiOx·MOy (M=Fe, Co, Ni) we obtained. The surface morphology of mixed oxides was found to depend on the nature of a dopant and change from micro-porous for TiOx·CoOy to globular for TiOx·NiO, and at least toroidal relief for TiOx·FeOy coatings. It was established that the formed mixed oxide coatings of titanium with the metals of iron triad 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 surface development degree. Obtained oxide systems exhibit catalytic activity in the model reaction of carbon (II) oxide conversion.

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