Abstract
This paper reports results on the interaction between an aluminum oxide film, deposited on technically pure titanium of grade VT1-0 by the magnetron reactive sputtering method, and a hydrogen-containing atmosphere. Such a study is important in order to find protective coatings that would prevent the penetration of hydrogen inside a product. A given system aged in a hydrogen atmosphere in the interval of 1‒4 hours at a pressure of 2∙105 Pa (2 bar) and a temperature of 400 °C. We have acquired data on the distribution of hydrogen along a film thickness and its content in a thin-film system. It is shown that hydrogen diffuses into the film and builds up in it up to three hours, and only then it begins to penetrate the substrate. We have managed to increase aging duration in a hydrogen-containing environment and increase the temperature of heating up to the stage of film destruction. In the case of the starting film and after aging from 1 to 3 hours the adhesion force between a film and a substrate increases, apparently due to the formation of hydrogen bonds film-substrate. The adsorption of hydrogen atoms at the surface of the Al2О3 film is accompanied by an increase in its conductivity by not larger than 4 % with the increased time of aging. Such a change in the conductivity of the Al2О3 film can be explained based on the formation of a zone structure. Thin oxide films may possess continuous one-side conductivity, but in the case the film is thick (0.5 µm and above), it is not possible to argue about the one-side conductivity. The data acquired on the influence of aging duration in a hydrogen atmosphere indicate an increase in adhesive strength by almost 6 times within 3 hours and by 2.5 times in 4 hours. The determined coefficient of film friction increases by not larger than 2.5 times. By measuring the electrical conductivity of the film surface, it was found that it increases with an increase in the time of aging in a hydrogen atmosphere. This pattern is obviously linked to the creation of transitions of the p-n-type in the film of aluminum oxide at the expense of hydrogen ions
Highlights
Hydrogen energy possesses the potential to implement a sustainable society as it can produce energy from various sources and in so doing does not emit carbon dioxide
A study into corrosion resistance and tendency to embrittlement in screws made from alloys of the system Ti-10Mo-8V-1Fe-3.5Al was reported in [5]; the results showed that the main cause of destruction of screws made from titanium alloys was the internal defects rather than hydrogen embrittlement
The aim of this study is to examine the effect of hydrogen on the thin-film system “aluminum oxide ‒ titanium”, namely, to investigate the distribution of hydrogen, as well as the film’s adhesive and sorption properties, and a change in friction coefficient
Summary
Hydrogen energy possesses the potential to implement a sustainable society as it can produce energy from various sources and in so doing does not emit carbon dioxide. It is necessary to solve many technical problems associated with the use of hydrogen, namely, the improvement of technologies of fuel cells, hydrogen production and storage, as well as the development of materials and systems, capable to withstand cyclic loads in a hydrogen.
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