Surface treatment chemicals and bath for aluminum or its...

Details Surface treatment chemicals and bath for aluminum or its... Surface treatment chemicals and bath for aluminum or its...

C - Chemistry, Metallurgy

23

C

148/17, 148/23

C23C 22/34 (2006.01) C23C 22/36 (2006.01) C23C 22/56 (2006.01)

Patent

CA 2022253

ABSTRACT OF THE DISCLOSURE A surface treatment chemical composition for aluminum or its alloys consisting essentially of 10-1000 parts by weight of niobium ion and/or tantalum ion, and 1-50 parts by weight of effective fluorine ion, and optionally 10-500 parts by weight of zirconium ion and/or titanium ion and 10-500 parts by weight of phosphate ion. A surface treatment bath is produced by diluting the surface treatment composition so as to have a pH of 1.5-4Ø Excellent resistance to blackening by boiling water and adhesion to an overlying polymer coating film can be obtained by surface treatment using this bath.

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