RUSTPROOFING AGENT FOR ZINC PLATED STEEL SHEET

WIPO Patent Application WO2002061174

A8

A rustproofing agent for a zinc plated steel sheet is provided which contains (A) a chromium aqueous solution containing an organic substance and (B) an acid metal such as a metal salt of nitric acid or phosphoric acid. All of the chromium in the chromium aqueous solution of component. A is trivalent chromium. It is preferable if the organic substance in component A contains at least one type of oxy acid or oxide thereof. The metal in the acid metal salt of component B is an alkaline earth metal, cobalt, nickel, iron, zirconium, titanium, etc. It is also preferable if (C) a water-dispersible silica is contained as an additional component. The present invention also provides a zinc plated steel sheet, in which at least one side of the surface of a zinc plated steel sheet is coated with the zinc plated steel sheet rustproofing agent and the rustproofing agent dried to form a coating with a dry coating weight of 0.01 to 3 g/m<2>.

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KINOSHITA YASUHIRO (JP)
KUMAGAI MANABU (JP)
KOZAKI TAKUMI (JP)

PCT/US2002/003112

September 04, 2003

January 31, 2002

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HENKEL KGAA (DE)
KINOSHITA YASUHIRO (JP)
KUMAGAI MANABU (JP)
KOZAKI TAKUMI (JP)

B05D7/14; C23C22/30; C23C22/53; C23C22/74; C23C28/00; (IPC1-7): C23C22/05; C23F11/00

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