Patent ID: 6866944

Claim:
An automobile fuel container material having improved environmental adaptability, comprising: a steel sheet; a zinc plating as a first layer provided at a coverage of 5 to 80 g/m 2 on at least one side of the surface of the steel sheet; a nickel plating as a second layer provided at a coverage of not more than 10 g/m 2 on the zinc plating as the first layer; and a post-treatment layer as a third layer provided at a coverage of not more than 5 g/m 2 on the nickel plating as the second layer, the post-treatment layer having been formed by coating using partially reduced chromic acid and a reducing organic compound as essential components, the amount of the reducing organic compound being not less than the reduction equivalent of chromium(VI) in the partially reduced chromic acid, and a ratio of a number of moles of the reducing functional group in the reducing organic compound to a number of moles of chromium (VI) contained in the partially reduced chromic acid being 3 or more.