Title:
LIQUID TRIVALENT CHROMATE FOR ALUMINUM OR ALUMINUM ALLOY AND METHOD FOR FORMING CORROSION-RESISTANT FILM OVER SURFACE OF ALUMINUM OR ALUMINUM ALLOY BY USING SAME
Document Type and Number:
WIPO Patent Application WO/2005/056876
Kind Code:
A1
Abstract:
Disclosed is a method for forming a film having excellent corrosion resistance and excellent adhesion to coating compositions over the surface of aluminum or an aluminum alloy using a liquid trivalent chromate which contains no harmful hexavalent chromium. Also disclosed is a hexavalent chromium-free liquid trivalent chromate for aluminum or aluminum alloys wherein the concentration of trivalent chromium is within the range of 0.01-100 g/L, the concentration of metal selected from the group consisting of zinc, cobalt, nickel and combinations thereof is within the range of 0.01-100 g/L and the concentration of fluorine is within the range of 0.01-50 g/L.
Inventors:
HASHIMOTO AKIRA (JP)
Application Number:
PCT/JP2004/018258
Publication Date:
June 23, 2005
Filing Date:
December 08, 2004
Export Citation:
Assignee:
DIPSOL CHEM (JP)
HASHIMOTO AKIRA (JP)
HASHIMOTO AKIRA (JP)
International Classes:
C23C22/34; C23C22/30; (IPC1-7): C23C22/56; C23C22/83
Domestic Patent References:
| WO2002020874A2 | 2002-03-14 |
Other References:
See also references of EP 1693485A4
Attorney, Agent or Firm:
Kumakura, Yoshio (Shin-Tokyo Bldg. 3-1, Marunouchi 3-chom, Chiyoda-ku Tokyo 55, JP)
Download PDF: