US 11,725,286 B2
Two-step pretreatment system and method
Steven J. Lemon, Lower Burrell, PA (US); Justin J. Martin, Irwin, PA (US); Kevin T. Sylvester, Lawrence, PA (US); Peter L. Votruba-Drzal, Pittsburgh, PA (US); and Gordon L. Post, Pittsburgh, PA (US)
Assigned to PPG Industries Ohio, Inc., Cleveland, OH (US)
Appl. No. 16/639,327
Filed by PPG Industries Ohio, Inc., Cleveland, OH (US)
PCT Filed Feb. 9, 2018, PCT No. PCT/US2018/017694
§ 371(c)(1), (2) Date Feb. 14, 2020,
PCT Pub. No. WO2019/036062, PCT Pub. Date Feb. 21, 2019.
Application 16/639,327 is a continuation in part of application No. PCT/US2017/046680, filed on Aug. 14, 2017.
Prior Publication US 2020/0248313 A1, Aug. 6, 2020
Int. Cl. C23C 22/82 (2006.01); C23C 22/83 (2006.01); C23C 22/66 (2006.01); C23C 22/12 (2006.01); C23C 22/56 (2006.01); C23C 22/73 (2006.01); C23C 22/78 (2006.01); C23C 22/36 (2006.01); C09D 5/12 (2006.01); C23C 22/48 (2006.01); C23C 22/00 (2006.01); C23C 22/07 (2006.01)
CPC C23C 22/66 (2013.01) [C09D 5/12 (2013.01); C23C 22/12 (2013.01); C23C 22/361 (2013.01); C23C 22/56 (2013.01); C23C 22/73 (2013.01); C23C 22/78 (2013.01); C23C 22/82 (2013.01); C23C 22/07 (2013.01)] 15 Claims
 
1. A system for treating a multi-metal article comprising:
(a) a first conversion composition for treating at least a portion of a non-aluminum metal surface of the multi-metal article, the first conversion composition comprising phosphate ions and zinc ions and being substantially free of fluoride; and
(b) a second conversion composition for treating at least a portion of an aluminum metal surface of the multi-metal article, the second conversion composition comprising a lanthanide series metal cation and an oxidizing agent; and/or
(c) a third conversion composition for treating at least a portion of the aluminum surface, the third conversion composition comprising an organophosphate compound, an organophosphonate compound, or combinations thereof;
wherein the multi-metal article comprises (1) an article that comprises the non-aluminum metal surface and the aluminum metal surface, (2) a first article comprises the non-aluminum metal surface and a second article comprises the aluminum metal surface, or (3) both (1) and (2); and
wherein the first conversion composition does not deposit on the aluminum metal surface.