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Title
Verfahren zur Herstellung von korrosionsgeschuetztem Stahlblech
Date Issued
2001
Author(s)
Goedicke, K.
Metzner, C.
Berner, K.
Ehlers, K.D.
Steinhoff, H.
Duerr, W.
Schuhmacher, B.
Patent No
1995-19527515
Abstract
A process for producing of corrosion-resistant thin steel sheet, in which a zinc-contg. coating (5) of at least 80 wt. % Zn is produced upon carbon-deficient thin steel sheet (1) by electrolytic means or immersion in a metal melt, is novel in that one or more metals (4) apart from Zn, or a metal alloy not contg. Zn is deposited by vacuum coating on the zinc-coated thin metal sheet, and then, without exposing it to an oxidising atmosphere, the sheet is heat treated in an inert gas atmosphere. The metal or metals or metal alloy not contg. zinc is produced by electron beam evaporation or magnetron sputtering. The corrosion-resistant thin steel sheet is subjected to ion bombardment or is heated to 150-400deg.C, pref. 220deg.C before the vacuum coating. The heat treatment following the vacuum coating is carried out at an inert gas pressure of 10-100 kPa, pref. 80 kPa for max. 100 seconds, pref. 0 seconds at 300-400deg.C. USE - Production of corrosion-resistant thin steel sheet used in the c onstruction industry, in household devices, and in the automobile industry, as well as in other industries. ADVANTAGE - The process combines the advantages of pure zinc coatings, i.e. cathodic protective effect, high ductility and comparatively low wear on shaping as well as simple, economical prodn., with those of zinc alloys, and, above all, good spot weldability and phosphate coating ability, good paint adhesion properties and good corrosion protection in the painted state. The process provides good flexibility in the choice of materials and high coating speed, and causes no environmental damage.
Language
de
Patenprio
DE 1995-19527515 A: 19950727