| abstract |
【Task】 Provided is an inorganic-organic composite treated zinc-based plated steel sheet that does not contain chromium in the treated film and has excellent post-degreased corrosion resistance, paint film adhesion and electrodeposition paintability. [Solution] A zinc phosphate-treated film is formed on the surface of a zinc-based plated steel sheet at a film amount of 0.3 to 5 g / m 2 , and further comprises a thiocarbonyl group-containing compound, a sulfide group-containing compound, and a guanidyl group-containing compound. 0.01 to 1 g by using a post-treatment agent containing at least one compound (A) selected from the group, an organic resin (B), a crosslinking agent (C), and an inorganic rust inhibitor (D). An inorganic-organic composite-treated galvanized steel sheet obtained by forming a post-treatment film having a film amount of / m 2 . [Selection diagram] None |