Chromium-free inactivating liquid used for galvanized steel sheet surface

• Main Authors: LIU JIANRONG, CHEN YONG, TU YUANQIANG, HUANG XIANQIU, CAI JIE, ZHANG WANLING
• Format: Patent
• Language: Chinese; English
• Published: 27.01.2010
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention relates to chromium-free passivation solution of galvanized coating, which solves the defect in an existing technique that the corrosion resistance of passive film is far different from the corrosion resistance of the passive film which adopts chromate originally. The technical measure is to use the chromium-free passivation solution on the surface of galvanized steel sheet, the chromium-free passivation solution is characterized in that components of the passivation solution and the method for preparing are that: molybdate: 80-160g/L, tungstate: 16-32g/L, acrylic acid: 15-50g/L, hydrogen peroxide: 20-40g./L, and phytic acid: 5-10g/L, others are water, the pH value is 1.5-2.5, and phosphoric acid is used to regulate the pH value. The passivation solution of the invention does not contain chromium which pollutes environment and is environmental protection type passivation solution, the fog-corrosion retardancy resistance of passive film is equivalent to that of chromate passive film, the equipmen