METHOD FOR MANUFACTURING HOT DIP GALVANIZED STEEL SHEET HAVING EXCELLENT DEGREASING PROPERTY

• Main Authors: TAKAHASHI KATSU, ISHIGAKI HAJIME, MIYAHARA KICHIHEI
• Format: Patent
• Language: English
• Published: 27.08.2009
• 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

PROBLEM TO BE SOLVED: To provide a method for manufacturing a hot dip galvanized steel sheet having excellent degreasing property. SOLUTION: The method for manufacturing the hot dip galvanized steel sheet includes: a temper-rolling step for temper-rolling the hot dip galvanized steel sheet; a contact step of bringing an aqueous solution containing ≥0.1 mmol/L to ≤50 mmol/L pyrophosphate radical into contact with the plating surface of steel sheet temper-rolled in a temper-rolling step; and a drying step of drying the steel sheet after the contact step. COPYRIGHT: (C)2009,JPO&INPIT