| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic matter coated steel sheet safe and harmless in production process and in use and further capable of obtaining excellent corrosion resistance. SOLUTION: The surface of a galvanized steel sheet or an aluminum-plated steel sheet is, as a first layer film, provided with a composite oxide film containing (α) oxide fine grains, (β) phosphoric acid and/or a phosphoric compound and (γ) one or more kinds of metals selected from among Mg, Mn and Al, and the upper part thereof is, as a second layer film, provided with an organic film containing a reaction product (X) between a film forming organic resin (A) and an active hydrogen-containing compound (B) in which a part or the whole of the compound is composed of a hydrazine derivative (C) containing active hydrogen and any rust preventive addition component (Y) of one or more kinds of organic compounds selected from among (a) Ca ion exchanged silica and phosphate, (b) Ca ion exchanged silica, phosphate and silicon oxide, (c) a calcium compound and silicon oxide, (d) a calcium compound, phosphate and silicon oxide, (e) molybdate and (f) triazoles, thiols, thiadiazoles, thiazoles and thiurams.
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