Patent ID: 6329067
Filing Date: 2001-12-11
Classification: C23C,Y10T

Abstract:
A chromated metal sheet comprising a metal sheet and a chromate film formed thereon by coating with a chromating solution comprising a water-soluble hexavalent chromium compound and as a reducing agent only an oxycarboxylic acid compound and in which hexavalent chromium ions produced by dissolution of the water-soluble hexavalent chromium compound have partly been reduced with an oxycarboxylic acid compound selected from the group consisting of tartaric acid, malonic acid, citric acid, lactic acid, glycolic acid, glyceric acid, tropic acid, benzilic acid and hydroxyvaleric acid, to trivalent chromium ions to 0.1 or less as a ratio of Cr 6+/total chromium ions, and the water-soluble hexavalent chromium compound is in a concentration of from 1 to 40 g/liter as the total chromium ions, followed by drying without washing with water.