METHOD OF DEPOSITING A ZINC LAYER ON THE SURFACE OF STEEL ELEMENTS AND A UNIT FOR DEPOSITION OF A ZINK LAYER ON THE SURFACE OF STEEL ELEMENTS

摘要

The subject of the invention is a method of depositing a zinc layer on the surface of steel elements and a unit for deposition of a zinc layer on the surface of steel elements, used for industrial coating of steel elements with increased strength requirements;The method is characterized by the charge for zinc deposition being placed in the central retort and the zinc powder with inert additives and activator is placed in the main retort, whereas both retorts are placed basically on the same axis, moreover the zinc powder in the form of a powder mixture is heated to a temperature exceeding 330°C, in which the activator decomposes into ammonia, chlorine and hydrogen, and afterwards, as a result of the flow of active gases forced by the fan, generating zinc chloride through the internal retort it covers the surface of the poured over elements by the contact of the steel charge with zinc and zinc chloride in gas form.;The unit is characterized by it being formed by a body, in which heating elements are placed and a chamber which forms the main retort for the pouring of the zinc powder and a smaller central retort, advantageously placed in the same axis with the main retort, used to contain the charge, whereas the central retort is placed on an axis connected with the drive mechanism, which causes an oscillatory movement around the lengthwise axis, and a fan for forcing the flow of the reaction atmosphere through the central retort, moreover the central retort cylinder has on both sides a perforated closure, ensuring the flow of reaction atmosphere and powder suspension.