Analysis of coatings with Al and Si additives for high-temperature oxidation of steel

The article presents an analysis of the influence of aluminum (Al) and silicon (Si) coating additions on the process of high-temperature oxidation of steel. After high-temperature oxidation of coatings deposited on steel substrates, the oxidation was carried out in an air atmosphere at 800C for 20 hours. The samples were oxidized on one side, i.e. they were placed on a quartz plate during the test. After oxidation, the unit mass increase of the samples was measured using a laboratory scale with an accuracy of 0.00001 g. It was examined how the addition of these elements affects the formation of protective oxide layers that limit corrosion at elevated temperatures. Aluminum contributes to the formation of stable aluminum oxide (Al₂O₃) layers, while silicon supports the formation of silicon oxide (SiO₂). Both oxides act as protective barriers, reducing the penetration of oxygen into the material, which slows down its degradation. The appropriate concentration of these admixtures improves the steel's resistance to oxidation without significantly impairing its mechanical properties. The article emphasizes the importance of appropriate selection of Al and Si content to increase the durability of steel in high-temperature operating conditions.