| abstract |
PROBLEM TO BE SOLVED: To provide a surface-treated steel sheet having excellent corrosion resistance without containing hexavalent chromium in the film, and having excellent conductivity and film appearance. SOLUTION: On the surface of a zinc-based plated or aluminum-based plated steel sheet, (α) silica, (β) phosphoric acid and / or a phosphoric acid compound, and (γ) Mg, Mn, Al as a first layer film. It has a composite oxide film containing one or more metals selected from the above and (σ) a tetravalent vanadium compound in a predetermined adhesion amount, and a film-forming organic resin ( A) and a reaction product (X) of an active hydrogen-containing compound (B) comprising a hydrazine derivative (C) in which some or all of the compounds have active hydrogen, and a specific antirust additive component (Y) Has an organic film. [Selection figure] None |