Effect of kinetic parameters on the efficiency of hydrogen isolation by method of dissolution of the AK7 alloy in alkali solutions with additives of activators

Abstract

The aim of the article is to study the influence of the main factors on the hydrogen evolution performance, in particular, the concentration of components, the nature of the electrolyte, the composition and surface condition of the aluminum alloy. For research, a MICROmed device was used, which has a temperature control and a mixing function. Weight corrosion tests were evaluated gravimetrically using the brand scales CERTUS Balance CBA-150-0.02. pH of solutions was measured using pH - meters mark 150 MA. Processing of the results was carried out by mathematical planning of experiments using the software package Exel 2016. It proposed a low-temperature chemical synthesis method by reacting hydrogen alloys of aluminum with alkali solutions with additives activators. The basic patterns of change in the dissolution rate of the AK7 alloy and formation of hydrogen halide from the impact of ions in alkaline solutions and its influence on the process condition of the alloy surface and reaction products. In this alloy, the most influential is the admixture of silicon, which is 3–6% by weight. The influence of the kinetic parameters of dissolution of the AK7 aluminum alloy on the synthesis of hydrogen as a source of environmentally safe thermal energy is determined. The dependences of the process of hydrogen evolution in alkaline solutions by the mechanism of hydrogen depolarization on the nature of the aluminum alloy and impurities of activators in the electrolyte are established. The processes of the metal chemical cycle of hydrogen production have been studied; they create the conditions for the further development of the technological process of aluminodepolarization synthesis of hydrogen without the use of membrane electrolyzers. This method is important for the needs of small energy in small quantities.