Abstract
The influence of the chemical composition of the Fe-Cr-Al system coatings on their heat resistance at 1100 °C was investigated. It is shown that the lowest oxidation rate is possessed by the coating obtained by aluminizing the Cr15Al5 alloy in the silumin melt, for which the depth of corrosion penetration after 500 h at 1100 °C was 2.5 μm. The depth of corrosion penetration in coating with a higher chromium content (23 at.%) reaches 8.9 μm. A decrease in the chromium content (up to 5 at.%) or aluminum (up to 10 at.%) in the surface layer is accompanied by a critical increase in the corrosion rate. Based on the kinetics of changes in the aluminum content in the surface layer, it was established that the coating obtained on the Cr23Al5 alloy has the highest heat resistance.
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