FIELD: technological processes.
SUBSTANCE: invention relates to chemical-thermal treatment of metal articles, in particular to diffusion zinc-plating, and can be used in machine building, instrument engineering, aviation and other industries. Method of applying zinc coating on metal articles by thermal diffusion zinc coating involves loading processed articles into sealed container, loading into container of saturating zinc-containing mixture, filling of container cavity with inert gas and heating. As saturating zinc-containing mixture, two-component zinc mixture is loaded into container. First component, in the form of zinc powder, needle shape with size of 3–5 mcm, is loaded directly into container, and the second component, in the form of zinc powder of ball shape with size of 20–25 mcm, is loaded into a capsule with walls destructed at temperature of 400 ± 20 °C, placed into a container simultaneously with processed articles. Zinc coating process is carried out in two steps, first, while heating to 350–380 °C to form an inner layer of zinc, and then after heating to temperature of destruction of capsule material 400 ± 20 °C and release of said zinc powder spherical shape, providing formation of outer coating layer.
EFFECT: longer service life of the article due to elimination of its corrosion and higher efficiency of the furnace, in which diffusion zinc coating is carried out, as well as reduced consumption of zinc per unit surface of the processed part.
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