Patent ID: 7291402
Filing Date: 2007-11-06
Classification: B05D,C08G,C09D,C23C,Y10T

Abstract:
1. A surface-treated steel sheet of good white rust resistance, which is fabricated by applying a surface-treating composition that contains: (a) a water-dispersible resin and/or a water-soluble resin obtained through reaction of an epoxy group-containing resin (A) with an active hydrogen-containing compound (B) a part or all of which is an active hydrogen-containing hydrazine derivative, (b) a silane coupling agent, and (c) a phosphoric acid and/or a hexafluoro-metal acid, wherein the hydrazine derivative is at least one member selected from the group consisting of hydrazide compounds, pyrazole compounds, triazole compounds, tetrazole compounds, thiadiazole compounds and pyridadine compounds, the amount of the silane coupling agent is from 15 to 50 parts by mass relative to 100 parts by mass of the solid content of the organic resin, and the amount of the phosphoric acid and/or the hexafluoro-metal acid is from 5 to 50 parts by mass relative to 100 parts by mass of the organic resin, to a zinc-plated or aluminum-plated steel sheet followed by drying it to form thereon a surface treatment film having a thickness of from 0.02 to 5 μm.