SURFACE-TREATED STEEL SHEET FOR FUEL TANK

摘要

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.