| 摘要 |
FIELD: metallurgy. ^ SUBSTANCE: procedure consists in loading batch of items into vessel of electric heating installation, in charging saturated zinc containing mixture, in vessel sealing, in its heating, in vessel conditioning in heating installation, and in unloading items from vessel. During galvanisation excessive pressure in the vessel is continuously released. As a zinc containing mixture there is used the mixture containing the following components wt %: zinc powder - 20-25 and alumina - 75-80. The saturating mixture is charged into the vessel with uniform distribution of charge above whole length of the vessel at amount of 8-16 % of weight of galvanised items. Upon sealing the vessel is positioned inside an inductor. A case of the vessel is heated with eddy currents to temperature 300-400C, while items - to temperature 768-910C with vessel rotation. There are performed from one to eight fluctuations of temperature in a zone of magnetic transformations of material causing magnet-striction effects by means of alternate cooling and heating the case of the vessel to the said temperature due to alternate inductor turning on and off. Further the vessel is withdrawn from the inductor and is subjected to forced cooling to temperature as high, as 250C at its rotation of a process table. ^ EFFECT: reduced duration of process cycle of application of anti-corrosive zinc coat; high quality of zinc coat with extended range of its thickness to 300 mcm and expanded set of galvanised items. ^ 5 cl, 6 dwg, 1 ex |
