CONTINUOUS COLORING METHOD FOR STAINLESS STEEL STRIP

摘要

PURPOSE:To color a stainless steel without uneven colors by spraying fogged water and air to the stainless steel strip right after the immersion into a coloring bath of an aq. soln. mixture composed of sulfuric acid, chromic anhydride and chromate. CONSTITUTION:The stainless steel strip 1 is passed through the coloring bath 7 of the aq. soln. mixture composed of sulfuric acid, chromic anhydride and/or chromate by immersion rolls 6 and is thereby continuously colored. The fogged water and air are sprayed by air injecting nozzles 13 and water dropping nozzles 14 to the above-mentioned stainless steel 1 emerging from the bath 7 to dilute and remove quickly the coloring liquid sticking to the steel strip 1 and at the same time to cool instantaneously the steel strip down to the temp. at which the coloring oxidation reaction does not arise. The stainless steel strip 1 is thereby continuously colored while the uneven coloration arising after the emergence from the bath 7 is prevented.