The method involves the thermodiffusion aluminizing of products made of common-quality carbon steel, quality structural steel, high-alloy steel, nickel alloy, titanium, and copper. The method provides a uniform coating on the whole surface of products, including the internal and external surfaces of parts, threaded connections, dead holes, and weld seams. The diffusion coating is 30 to 100 microns thick or thicker. The coating is corrosion and heat resistant; and the aluminized samples have passed testing at temperatures from 600 to 900оC. The coatings meet the quality requirements. The raw materials used for coating deposition are available and are produced in Russia.
ADVANTAGES
• The coating deposition temperature and the saturation time are reduced as compared to those in the existing aluminizing technologies. Coatings can be applied on hardware made of quality steel.
• Replacement of aluminized steel used for the manufacture of welded thin-wall pipes to protect them against corrosion when they operate at large temperature gradients and in sulfur-containing media.
• Raw materials are used in a closed cycle. The technology is free from gas and dust emissions to the atmosphere.
