Abstract
This work is devoted to studying the accumulation of hydrogen in titanium coatings to use a completely new concept of hydrogen accumulators based on a system of easily replaceable cartridges. Modern hydrogen accumulators based on magnesium powder have several problems associated with uneven heating during hydrogen desorption. Increasing the efficiency of hydrogen accumulators and the possibility of their reuse and/or repair remains a topical problem. For the analysis of the microstructure of the received titanium coatings, scanning electron microscopy (SEM) was used, the structural-phase state was studied using x-ray diffraction (XRD) analysis. The coatings were hydrogenation by gas-phase saturation at 450–550 °C. Increased film thickness reduced the storage capacity of coatings. Besides hydrogenation at 450 °C, 20 µm of titanium coatings accumulated 3.96 wt.%, while 80 µm of coatings accumulated 3.98 wt.%. The chemical composition of the coatings before and after the hydrogenation was controlled using glow-discharge optical emission spectroscopy.
Highlights
Hydrogen atoms, having a uniquely small mass and size, can be effectively accumulated in the crystal lattice of metals
Mg film consists of nanocrystals and amorphous crystals in which the rate of hydrogen diffusion is fast, which speeds up the rate of hydrogen sorption/desorption
It was assumed that the increase in the coating thickness should reduce the hydrogen sorption ability due to the growth of the hydride layer, which inhibits the diffusion of hydrogen
Summary
Hydrogen atoms, having a uniquely small mass and size, can be effectively accumulated in the crystal lattice of metals. Mg film consists of nanocrystals and amorphous crystals in which the rate of hydrogen diffusion is fast, which speeds up the rate of hydrogen sorption/desorption. These films are well studied, but there is a problem of the oxidation of. A system of heat-exchange elements with bee honeycomb geometry is used; metals or alloys with high ohmic resistance are chosen as foil materials, which are determined by the effective use of low inertia hydrogen thermodesorption modes. The thickness and porosity of metal films can affect sorption characteristics due to the various mechanisms of hydrogen diffusion It is of practical and scientific interest to determine the peculiarities of hydrogen accumulation and distribution in metallic coatings depending on the application and hydrogenation conditions
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