Coating compositions and method for the treatment of metal surfaces

Patent · Tue Sep 11 00:00:00 EDT 1984

OSTI ID:6401941

Das, N; Stastny, P M

An aqeuous acidic composition provides improved coating for aluminum. The composition comprises from about 10 to about 150 ppm zirconium, from about 20 to about 250 ppm fluoride, from 30 to about 125 ppm tannin, from about about 15 to about 100 ppm phosphate and from about 5 to about 50 ppm zinc, said coating solution having a tannin to phosphate ratio in the range of at least about 1:1 to about 2:1 and a pH in the range of about 2.3 to about 2.95.

• Assignee: Coral Chemical Company
• Patent Number(s): US 4470853
• Application Number: TRN: 85-000178
• OSTI ID: 6401941
• Resource Relation: Patent File Date: Filed date 30 Oct 1983; Other Information: PAT-APPL-538585
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
PROTECTIVE COATINGS
CHEMICAL COMPOSITION
AQUEOUS SOLUTIONS
FLUORIDES
PH VALUE
PHOSPHATES
TANNIC ACID
ZINC
ZIRCONIUM
AROMATICS
CARBOXYLIC ACIDS
COATINGS
DISPERSIONS
ELEMENTS
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROXY COMPOUNDS
METALS
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHENOLS
PHOSPHORUS COMPOUNDS
POLYPHENOLS
SOLUTIONS
TRANSITION ELEMENTS
360101* - Metals & Alloys- Preparation & Fabrication