Synthesis of Titanium-Containing Coatings in Aqueous-Organic Electrolytes

Abstract

The conditions and results of low-temperature electrochemical synthesis, allowing for the targeted production of phases of a given composition on the titanium surface, are considered. Functional coatings were obtained on thin (10÷15 μm) titanium layers in the potentiostatic mode at potential values of 4÷10 V and a maximum current of no more than 0.02 A in aqueous-organic electrolytes based on ethylene glycol, in the presence of additives of various salts in the concentration range from 0.05 to 0.5 wt. %. As a result of electrochemical treatment of the titanium surface in electrolytes, solid electrically conductive films with a mirror surface from light yellow to bronze shades are formed. The microhardness of the coatings, measured by the Vickers method, is at least 946 HV 0.1, which indicates the high mechanical strength of the materials. The specific resistance of the coatings does not exceed 2.1 Ohm.cm. X-ray photoelectron spectroscopy studies of the elemental composition and chemical states of the resulting coatings reveal the presence of titanium, oxygen, carbon, and nitrogen on the sample surfaces, with oxygen primarily present in the upper oxidized layer. Coatings obtained in all studied electrolytes contain the Ti(CXNY) phase and oxide phases (TiO, Ti2O3, TiO2).