Phase Composition of Coatings Formed on Titanium in Borate Electrolyte by Microarch Oxidation

The effect of oxidation conditions, temperature and concentration of the electrolyte, and its transformation from the true to colloidal solution on the phase composition and electrical resistance of coatings was studied.     

Composition and Catalytic Activity of Plasma-Electrolytic Manganese Oxide Films on Titanium,Modified with Silver Compounds

The effect of impregnation in aqueous solutions of AgNO₃ and subsequent calcination of manganese oxide surface structures produced on a titanium substrate by plasma-electrolytic oxidation on their catalytic activity in oxidation of CO was studied.     

Nickel- and copper-containing oxide films on titanium

We have studied the composition and structure of films 20–30 μm thick prepared by plasmaassisted electrochemical oxidation (PEO) and additionally modified by impregnation in aqueous solutions of nickel and copper nitrates and then annealed. The investigative tools used were powder X-ray diffraction, electron probe microanalysis (EPMA), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy. Unmodified film/titanium composites have a certain catalytic activity in CO oxidation to CO₂ at temperatures above 300°C; for modified layers, these temperatures are noticeably higher. Modification influences the surface structure, relief, and elemental composition. Relations between the composition and catalytic properties of the oxide layers are discussed.     

Titanium-supported nickel-copper oxide catalysts for oxidation of carbon(II) oxide

Nickel-copper compositions for catalytic oxidation of carbon(II) oxide to carbon(IV) oxide were prepared by impregnation of oxide films on titanium surface, obtained by plasma electrolytic oxidation followed by annealing. Plasma electrolysis oxide coatings with a layer thickness of 5 to 50 μm were generated using different electrolytes. The compositions were studied by X-ray powder diffraction, X-ray spectral analysis, and electron microscopy, and moisture absorption of the initial plasma electrolytic structures was estimated. A linear correlation was found between the overall concentration of nickel and copper (4 to 25 mol %) in the surface layer of ∼2–5-μm compositions and their catalytic activity. The overall concentration of nickel and copper was found to increase in parallel with the moisture absorption of plasma electrolytic oxidation coatings. Nickel-copper compositions based on plasma electrolytic oxidation coatings generated in a silicate electrolyte displayed the best catalytic, mechanical, and adhesion properties.     

Manganese-Containing Anodic Layers on Titanium

Data on formation of anodic layers containing MnTiO₃, -Mn₂TiO₄, Mn₂O₃, Mn₃O₄, and Mn₃(BO₃)₂ on titanium from aqueous electrolytes at sparking voltages are presented.     

Influence of plasma-electrolytic treatment of titanium on the composition and properties of ruthenium-titanium oxide anodes

Data on elemental and phase composition, morphology, and electrocatalytic behavior in dilute chloride solutions of ruthenium-titanium oxide anodes subjected to preliminary plasma-electrolytic treatment are presented.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 12, 2004, pp. 1968–1973.Original Russian Text Copyright © 2004 by Vasileva, Rudnev, Tyrina, Kondrikov, Kuryavyi, Shchitovskaya.     

Plasma-electrochemical formation of oxide layers on titanium in aqueous electrolytes with trilonate complexes of manganese

Layered oxide coatings catalyzing oxidation of CO to CO₂ by plasma-electrolytic oxidation in aqueous electrolytes with trilonate complexes of manganese were studied. Data on the elemental composition of their surface and deep layers, phase composition, and specific features of growth were obtained.     

Catalytic Activity of Manganese-containing Layers Formed by Anodic-Spark Deposition

The catalytic activity of manganese oxide-containing anodic layers formed on titanium at room temperature in CO oxidation to CO₂ was studied.     

Photoelectrochemical Properties of Oxide Systems Formed by Plasma Electrolytic Oxidation

Russian Journal of General Chemistry - This paper describes the photoelectrochemical properties of titanium oxide formed by plasma electrolytic oxidation. The possibility of correlation between the...