VERFAHREN ZUR HERSTELLUNG EINES SPEZIALFEINBLECHES FUER DAUERHAFTE WAGENKAROSSERIEN UND EIN HIERNACH HERGESTELLTES FEINBLECH

摘要

Thin metal plate is cleaned and electrolytically pickled in an acid solution. A zinc layer is electrodeposited on one face of the plate, after which a chrome-chromic oxide coating is deposited on both faces of the plate from a sulphuric acid solution containing compounds of trivalent and hexavalent chrome. The plate is then subjected to a drying-oxidating treatment in air. The plate may be steel having a thickness between 0.1 and 2 mm. The plate may be surface treated by phosphating, and then painted. The chrome-chromic oxide coating may have a thickness between 0.05 and 5 mu m, and the zinc coating a thickness between 1 and 30 mu m.