The Influence of Modes of Deposition of Coatings on the Corrosion Resistance of Welded Joints of Steels in Acidic Media

In this work, effect of welding on corrosion of welded joints of austenitic steel 12KH18N10T. It is shown that the use of pulsed - arc welding steel 12KH18N10T allows you to create a protective coating with dispersed structure with less thermal impact on the zone of the welded joint. Coating is of such structure allows 1.5 to 6 times to reduce the corrosion rate of welded joints of steel 12KH18N10T in active chemical environments. Pulse the process of deposition of coatings on welded joint of steels can be effectively used for the protection against corrosion in the repair of equipment of chemical industry. The results obtained can be recommended for use when welding a protective corrosion - resistant coatings on working surfaces of equipment of chemical productions

THE EFFECT OF TiO2 CALCINATION FOR CuS/TiO2 PHOTOCATALYST ON HYDROGEN EVOLUTION RATE

The active titania-based photocatalysts has been synthesized via thermal activation of ti-tanium dioxide and cupper deposition on the titania surface. These photocatalysts has been characterized of XRD and XPS techniques and tested in the hydrogen evolution reaction un-der UV-light irradiation.This work was supported by Russian Science Foundation (grant #19-73-20020)

SURGICAL APPROACHES DURING KNEE REVISION ARTHROPLASTY

The authors analyzed the results of different surgical approaches during 144 revision TKA. The need in extension of standard approach appeared in 24 (22,2%) patients: Coonse-Adams in 9 (8,3%), tibial tuberosity osteotomy in 6 (5,6%), quadriceps snip in 4 (3,7%) and combination of two lateral approaches to the distal femur and the knee in 5 (4,6%) patients with distal femur fracture for simultaneous osteosynthesis and implant revision. During revision TKA method of choice is the standard approach to the knee. Extensive approaches allow better visualization during surgery but may compromise knee function

Nonstoichiometric titanium dioxide nanotubes with enhanced catalytical activity under visible light

The catalytic activity of nanotubular titanium dioxide films formed during the oxidation of acetone to carbon dioxide under the action of visible light with a wavelength of 450 nm was found to be approximately 2 times higher compared to standard titanium dioxide (Degussa P25). The nanotubular films were grown by the anodization of titanium foil using an original technique. Diffuse reflectance spectra of the films are attributed to enhanced activity in the visible spectrum by the nonstoichiometry of titanium dioxide near the interface between the nanotubular film and the titanium foil substrate.Comment: 10 pages, 9 figures, 1 Table, 43 reference

Surface softening in metal-ceramic sliding contacts: An experimental and numerical investigation

This study investigates the tribolayer properties at the interface of ceramic/metal (i.e., WC/W) sliding contacts using various experimental approaches and classical atomistic simulations. Experimentally, nanoindentation and micropillar compression tests, as well as adhesion mapping by means of atomic force microscopy, are used to evaluate the strength of tungsten?carbon tribolayers. To capture the influence of environmental conditions, a detailed chemical and structural analysis is performed on the worn surfaces by means of XPS mapping and depth profiling along with transmission electron microscopy of the debris particles. Experimentally, the results indicate a decrease in hardness and modulus of the worn surface compared to the unworn one. Atomistic simulations of nanoindentation on deformed and undeformed specimens are used to probe the strength of the WC tribolayer and despite the fact that the simulations do not include oxygen, the simulations correlate well with the experiments on deformed and undeformed surfaces, where the difference in behavior is attributed to the bonding and structural differences of amorphous and crystalline W-C. Adhesion mapping indicates a decrease in surface adhesion, which based on chemical analysis is attributed to surface passivation