Improvement of Carbon Steel Scale Resistance by Combined Titanizing and Aluminizing from Multilayer Coatings

Results are presented for research on the problem of increasing the stability and durability of a diffusion aluminized coating on carbon steel 45 when held in an oxidizing atmosphere at 1100°C. A method is proposed for aluminizing from a three-layer impregnation mixture in which resorption of the aluminized layer is excluded and good oxidation resistance of the protected steel is provided. Experimental tests of an aluminized specimen made of steel 45 at a temperature of 1100°C for 200 hours showed that under the specified conditions there is 10% better oxidation resistance than for steel 12X18H10T and 1140% better than for unaluminized steel 45.