OXIDATION KINETICS OF AK7 ALUMINUM ALLOY AND COMPOSITE MATERIAL BASED ON ALUMINUM Al-Al2O3 («OXIDALLE») IN THE SOLID STATE
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DOI:
https://doi.org/10.25712/ASTU.2072-8921.2022.4.2.020Keywords:
aluminum alloy AK7, composite material, "Oxidalle", thermogravimetric method, oxidation kinetics, true oxidation rate, activation energy of oxidation.Abstract
Corrosion and oxidation of alloys are one of the main reasons why products lose their properties and functions. The use of materials with high resistance to oxidation can be a solution to many problems in the use and operation of modern technologies and equipment in various conditions. Therefore, the study of the interaction of oxygen with metals and alloys, as well as the identification of the patterns of their interaction, has become of great importance recently, due to the need for new materials with special physical and chemical properties, and the widespread use of such materials in various fields of science and technology. Composite materials based on aluminum and various additives to aluminum alloys can become the basis for obtaining special properties.
The results of the study of the process of oxidation of the aluminum alloy AK7 and the composite material of the Al-Al2O3 system (Oxidalle) are presented. The need to study the oxidation process of the AK7 alloy and the composite material determines the possibility of their use in oxygen-containing or oxygen-saturated media.
Studies of alloys under isothermal conditions were carried out by the thermogravimetric method in air, recording the mass of samples for an hour at a temperature of 623; 773 and 823K. In this case, the increase in the specific gravity of the samples was determined. Oxidation in time was determined depending on the size of the surface of the samples.
Based on these data, kinetic oxidation curves were constructed, and the values of the specific increase in the mass of the samples, that is, the AK7 aluminum alloy and the Oxidalle composite material, were determined depending on time and temperature.
Because of the research, it was found that the Oxidal composite material has a lower oxidation rate compared to the AK7 alloy, because the value of the activation energy of the oxidation process in «Oxidalle» is higher than that of the aluminum alloy AK7.
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