TIN-PLATED STEEL SHEET AND METHOD FOR PRODUCING THE SAME

摘要

A tin-plated steel sheet consists of a steel sheet (1); a tin plating film (3) formed on one surface of the steel sheet (1) at 1.2 g/m2 or greater; a tin-iron alloy film (2) formed between the steel sheet (1) and the tin plating film (3) by alloying the steel sheet (1) and the tin plating film (3); and a chromate film (4) formed on the tin plating film (3) at between 3 mg/m2 and 8 mg/m2 in terms of metallic chromium. At the surface of the tin plating film (3), the ratio of bivalent tin atoms to the total amount of tin atoms is 35% or greater but less than 75%; the ratio of tetravalent tin atoms to the total amount of tin atoms is less than 50%; and the ratio of nonvalent tin atoms to the total amount of tin atoms is 30% or less.