Surface treatment chemicals and bath for aluminum or its alloy a

Details Surface treatment chemicals and bath for aluminum or its alloy a Surface treatment chemicals and bath for aluminum or its alloy a

1993-12-23

1995-06-06

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148273, C23C 2236

Patent

active

054219132

ABSTRACT:
A surface treatment chemicals for aluminum or its alloy 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 chemicals so as to have a pH of 1.5-4.0. Excellent resistance to blackening by boiling water and adhesion to an overlying polymer coating film can be obtained by a surface treatment using this bath.

REFERENCES:
patent: 4264378 (1981-04-01), Oppen
patent: 4370177 (1983-01-01), Frelin
patent: 4992115 (1991-02-01), Ikeda
Gmelins Handbuch der Anorganischen Chemie Nb [B1] 145 1970.

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