Steel plate for use in fuel tank

• Main Authors: MAEKAWA, NORIYUKI, YAMAOKA, IKURO, FUDA, MASAHIRO, ISHIZUKA, KIYOKAZU, MATSUMURA, KENICHIRO, URAMOTO, HIROAKI
• Format: Patent
• Language: Chinese; English
• Published: 16.09.2016
• 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; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; PERFORMING OPERATIONS; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING

A steel plate for use in a fuel tank and equipped with a Zn-Ni alloy plating layer positioned on one or both surfaces of a ferrite, and an inorganic chromate-free conversion coating positioned on the top layer of the Zn-Ni alloy plating layer, wherein the Zn-Ni alloy plating layer has cracks extending from the interface between the Zn-Ni alloy plating layer and the inorganic chromate-free conversion coating to the interface between the Zn-Ni alloy plating layer and the steel plate, and the water contact angle on the surface of the inorganic chromate-free conversion coating is 50 degrees or more.