APPLICATION METHOD OF CORROSION PROTECTION COATING ONTO METAL PRODUCTS BY THERMODIFFUSION ZINC PLATING Russian patent published in 2013 - IPC C23C10/36 

FIELD: metallurgy.

SUBSTANCE: corrosion protection coating is applied onto metal products in a sealed container arranged in a muffle furnace. Treated parts are arranged in the container in a regular manner in accessories with supporting surfaces, which fix them and prevent their direct contact between each other and movement relative to each other at movement of the container so that minimum distance between treated surfaces of parts is 3-5 mm. During zinc plating process, treated parts can perform movements relative to supporting surfaces of the accessories in the container by not more than 5-10 mm. Saturating mixture contains zinc crystals with purity of 0.97-0.99% of needle shape with coefficient of effective surface area of 10. Saturating mixture has particle size distribution at the interval of 3-7 mcm, and its weight is 1-4% of the weight of treated parts or 130-140% of the weight of the required coating on surface of treated parts.

EFFECT: increasing service life of a product owing to excluding its corrosion and increasing productivity of a furnace, in which diffusion zinc plating is performed; reducing zinc consumption in terms of per unit of surface of treated part.