Surface-treated steel sheet for fuel tank

• Main Authors: MAEKAWA, NORIYUKI, ISHIZUKA, KIYOKAZU, SHINDO, HIDETOSHI, MATSUMURA, KENICHIRO, KIKUCHI, IKUO, URAMOTO, HIROAKI
• Format: Patent
• Language: Chinese; English
• Published: 01.11.2016
• Subjects: APPARATUS THEREFOR; 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; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

A surface-treated steel sheet for a fuel tank, wherein the surface-treated steel sheet for a fuel tank is provided with a Zn plating layer or a Zn-Ni alloy plating layer formed on at least the surface of the steel sheet used as a fuel tank inner surface, and a chromate-free chemical conversion coating layer containing a water-and-oil repellent positioned over the Zn plating layer or the Zn-Ni alloy plating layer, and the water contact angle on the surface of the chromate-free chemical conversion coating layer is at least 70 degrees, and the n-hexadecane contact angle on the surface of the chromate-free chemical conversion coating layer is 30 to 70 degrees.