Title:
NICKEL-ZINC PHOSPHATE CONVERSION COATINGS AND PROCESS FOR MAKING THE SAME
Document Type and Number:
WIPO Patent Application WO2000008224
Kind Code:
A3
Abstract:
A method of applying a phosphate conversion coating to a metal surface, including the steps of: (a) providing an aqueous, acidic treatment solution comprising: phosphate ions; zinc cations; and nickel (II) cations; wherein the treatment solution has between about 2.1 and about 6.0 points of free acid; and (b) contacting the metal surface with the treatment solution for a time and at a temperature sufficient to form a phosphate conversion coating on the metal surface. A metal object coated in this manner is also provided, and the gram-atom percent of nickel to the total amount of nickel and zinc in the coating is between about 10 and about 13.
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Inventors:
CONWAY JOSEPH J
GOZE KENNETH E
GOZE KENNETH E
Application Number:
PCT/IB1999/002045
Publication Date:
August 17, 2000
Filing Date:
July 21, 1999
Export Citation:
Assignee:
BRENT INT PLC (GB)
International Classes:
C23C22/12; C23C22/36; (IPC1-7): C23C22/12; C23C22/13; C23C22/36
Domestic Patent References:
| WO1999032687A1 | 1999-07-01 |
Foreign References:
| GB811645A | 1959-04-08 | |||
| DE4228470A1 | 1994-03-03 | |||
| DE4241134A1 | 1994-06-09 | |||
| EP0434358A2 | 1991-06-26 | |||
| FR2365642A1 | 1978-04-21 | |||
| US4681641A | 1987-07-21 | |||
| DE3630246A1 | 1988-03-10 | |||
| EP0287133A1 | 1988-10-19 |
Other References:
DATABASE WPI Section Ch Week 197436, Derwent World Patents Index; Class M13, AN 1974-63886V, XP002136328
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