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    • 5. 发明授权
    • Chromating solution and chromated metal sheet
    • 铬酸盐溶液和铬酸盐金属片
    • US06329067B2
    • 2001-12-11
    • US09752469
    • 2001-01-03
    • Yukio UchidaHirofumi TaketsuShinya Furukawa
    • Yukio UchidaHirofumi TaketsuShinya Furukawa
    • B32B1504
    • C23C22/33C23C22/30Y10T428/31678
    • In a chromating solution comprising a water-soluble chromium compound and a reducing agent and in which hexavalent chromium ions produced by dissolution of the water-soluble chromium compound have been partly reduced with the reducing agent to trivalent chromium ions, an oxycarboxylic acid compound is used as the reducing agent. This chromating solution causes neither gelation nor sedimentation of the solution even when hexavalent chromium ions are reduced to trivalent chromium ions at a reduction percentage of more than 50%. The chromating solution and a chromate film formed on a steel sheet may also contain an organic resin, phosphoric acid or a phosphoric acid compound, or a silica sol.
    • 在包含水溶性铬化合物和还原剂的铬酸盐溶液中,通过还原剂将三价铬离子部分还原,其中通过溶解水溶性铬化合物产生的六价铬离子被使用,使用羟基羧酸化合物 作为还原剂。 即使当六价铬离子以大于50%的还原率还原成三价铬离子时,该铬酸盐溶液也不会引起溶液的凝胶化和沉淀。 形成在钢板上的铬酸盐溶液和铬酸盐膜也可以含有有机树脂,磷酸或磷酸化合物或二氧化硅溶胶。