International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The protective coatings of Al2O3 and AlN on iodide titanium in initial state and after annealing in a hydrogen atmosphere were investigated by scanning electron microscopy. It was found that the coatings protect titanium from the interaction with hydrogen at a pressure of 0.6 MPa up to 650 °C. It was shown that at 700 °C and pressure 0.6 MPa cracking of the protective coatings occurred, and the process of active absorption of hydrogen started.

The microstructure and phase composition of Ti47,5Zr30,2Mn15,5V5Ho2 multiphase alloy and the phase composition of the hydrogenation product were investigated by scanning electron microscopy and X-ray phase analysis. It was established that holmium introduced into the alloy not only dissolves in the phase components of the eutectic, but also forms a new phase (oxide). The formation and further growth of crystals of holmium oxide occurs only on the surface of the crystallites of Laves phase. During the first hydrogenation the active absorption of hydrogen by the alloy occurred only when it was heated up to 520 °C, with hydrogen capacity of 2.62 wt.%. The hydrogenation product obtained after the saturation of the alloy with hydrogen contained a new phase, in addition to the hydrides based on the initial phases. After the sorption-desorption cycle, the alloy was already in the activated state and able to absorb hydrogen at room temperature and low pressure (0.21 MPa) starting from the first seconds of contact with the hydrogen medium.

The microstructure and phase composition of the eutectic alloy Ti47.5Zr30.2Mn22.5 obtained using titanium sponge, as well as the phase composition of hydrogenation product were investigated by scanning electron microscopy and X-ray phase analysis. It was found that when iodide titanium was completely replaced by titanium sponge, the alloy structure remained eutectic and consisted of bcc solid solution and Laves phase. It was shown that after a sorption-desorption cycle the alloy was in activated state and was capable to absorb hydrogen at room temperature and low pressure (0.21 MPa) starting from the first seconds of contact with hydrogen atmosphere, with hydrogen capacity of 2.61 wt.%.