ALUMINUM-PLATED STEEL SHEET FOR FUEL TANK AND PROCESS FOR PRODUCING FUEL TANK FROM THE STEEL SHEET

摘要

An aluminum-plated steel sheet for fuel tanks which is obtained by directly forming a resin film comprising an alkali-soluble resin on a surface of an aluminum-plated steel sheet and is excellent in scoring resistance during pressing and resistance to corrosion by the fuel to be stored. The alkali-soluble resin is preferably a urethane or acrylic resin which is soluble in an aqueous alkali solution having a pH of 9.0 or higher, has incorporated in the molecule thereof carboxyl groups wherein 1 to 50 % of the hydrogen atoms may have been replaced with an alkali metal, and has an acid value of 40 to 90. The resin film may contain 1 to 25 wt.% synthetic resin particles and/or 1 to 30 wt.% silica particles. The film preferably has a thickness of 0.2 to 5.0 mu m. The aluminum-plated steel sheet having the resin film is shaped into an upper fuel tank member and a lower fuel tank member by pressing and then subjected to an alkali cleaning to dissolve away the resin film. The upper and lower tank members are then bonded to each other and the external surface thereof is coated to produce a fuel tank.