US 7,491,274 B2
	Non-chrome metal treatment composition
William S. Carey, Wallingford, Pa. (US); Michael T. Raab, Langhorne, Pa. (US); Edmund P. Szwajkowski, Bensalem, Pa. (US); and Jeffrey I. Melzer, Lansdale, Pa. (US)
Assigned to Chemetall Corp., Providence, N.J. (US)
Filed on Oct. 29, 2004, as Appl. No. 10/977,587.
Prior Publication US 2006/0090818 A1, May 04, 2006
This patent is subject to a terminal disclaimer.
Int. Cl. C23C 22/00 (2006.01)

U.S. Cl. 148—250  [427/427.4]

11 Claims

1. A method of forming a conversion or passivation coating on a metal surface comprising contacting said metal surface with an aqueous treatment composition comprising (a) a phosphonomethylated polyamine.