GB484983A - Method of and apparatus for zincifying iron articles - Google Patents

Abstract

484,983. Coating with metals. SCHREIBER, F., and METAMINE GES. Aug. 11, 1936, No. 22062. [Class 82 (ii)] Iron plates &c. treated with an aqueous solution of iron and acid-free chloride of zinc are introduced into a heating chamber to produce a crust of zinc chloride on the articles which pass automatically into a zinc-lead bath, the zinc layer of which is maintained free of oxides and hard zinc and is mechanically freed from slag. When in the lead the articles are turned into a vertical position and as they rise to the surface they are freed from the zinc chloride crust and, after coating by passage through the zinc layer, are conveyed to a cooling device. In the preferred apparatus vats are provided for the preliminary treatment, that holding the zinc chloride being made of or lined with lead or copper and the articles are carried through the heating chamber 20 by a chain conveyer 19 and passed by heated rollers 22, 25, 30 into a V -shaped guide 44 immersed in the lead. Teeth on the lower rollers swing the article 1 to the other side of the guide and it rises between rollers 48 and divergent plates 47 which remove the zinc chloride crust and guide it clear of the path of the article. Rolls 51, cleaned by brushes 91, and additional rollers 52, 53 all of which are internally cooled carry the articles to a conveyer 72 leading to a rotary cooling rack. The surface of the zinc between the upper ends of the plates 47 is freed from slag by paddles 58, 58a, Fig. 3, reciprocated by a rotary disc 68 and connecting rod 67, and also raised and lowered by cams 63, 63a. The zinc layer 27 is kept free from impurities by periodic deoxidation treatment and by the provision of a ceramic coating for the metalwork of the bath 29 and of a fireclay lining backed by heat-conducting material at the zinc-lead juncture. Specifications 426,868 and 450,690 are referred to.