The process of thermo-diffusion zinc coating is supplied an effective corrosion protection of different articles, including screwed, made from steel and cast iron and working on opened air, in industrial and marine atmosphere - in any place where the required thickness of coating is more than 20 microns. The coating is uniform and does not require additional mechanical treatment like padding surface preparation to coloring, gumming and other coverings. The coating provides full protection for iron-based sintered parts.