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Title: Zinc phosphate conversion coatings

Zinc phosphate conversion coatings for producing metals which exhibit enhanced corrosion prevention characteristics are prepared by the addition of a transition-metal-compound promoter comprising a manganese, iron, cobalt, nickel, or copper compound and an electrolyte such as polyacrylic acid, polymethacrylic acid, polyitaconic acid and poly-L-glutamic acid to a phosphating solution. These coatings are further improved by the incorporation of Fe ions. Thermal treatment of zinc phosphate coatings to generate {alpha}-phase anhydrous zinc phosphate improves the corrosion prevention qualities of the resulting coated metal. 33 figs.
Inventors:
Issue Date:
OSTI Identifier:
441855
Assignee:
Associated Universities, Inc., Washington, DC (United States) PTO; SCA: 360601; 360105; PA: EDB-97:041924; SN: 97001739249
Patent Number(s):
US 5,604,040/A/
Application Number:
PAN: 8-565,902
Contract Number:
AC02-76CH00016
Resource Relation:
Other Information: PBD: 18 Feb 1997
Research Org:
Associated Universities Inc
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ZINC PHOSPHATES; PROTECTIVE COATINGS; METALS; CORROSION PROTECTION; HEAT TREATMENTS; PROMOTERS; CORROSION RESISTANCE; FABRICATION