US 12,221,703 B2
Solution based corrosion inhibitors for aluminum alloy thermal spray coatings
Christopher W. Strock, Kennebunk, ME (US); William J. Joost, Worcester, MA (US); and Promila P. Bhaatia, Farmington, CT (US)
Assigned to RTX Corporation, Farmington, CT (US)
Appl. No. 17/273,845
Filed by Raytheon Technologies Corporation, Farmington, CT (US)
PCT Filed Sep. 20, 2019, PCT No. PCT/US2019/052106
§ 371(c)(1), (2) Date Mar. 5, 2021,
PCT Pub. No. WO2020/061427, PCT Pub. Date Mar. 26, 2020.
Claims priority of provisional application 62/734,883, filed on Sep. 21, 2018.
Prior Publication US 2021/0348278 A1, Nov. 11, 2021
Int. Cl. C23C 22/30 (2006.01); C23C 4/08 (2016.01); C23C 4/129 (2016.01); C23C 4/18 (2006.01); C23C 22/34 (2006.01); C23C 22/76 (2006.01); C23C 22/82 (2006.01); C23C 22/24 (2006.01); C23C 22/56 (2006.01); F01D 5/28 (2006.01)
CPC C23C 22/34 (2013.01) [C23C 4/08 (2013.01); C23C 4/129 (2016.01); C23C 4/18 (2013.01); C23C 22/76 (2013.01); C23C 22/82 (2013.01); C23C 2222/10 (2013.01); F01D 5/282 (2013.01); F01D 5/288 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method (400) for applying a coating to a substrate (124), the method comprising:
spraying (414) an aluminum-based coating layer (120) on the substrate; and
infiltrating (420) the aluminum-based coating layer with an aqueous solution (610) of:
a source of chromium; and
potassium hexafluorozirconate,
wherein the aluminum-based coating layer has:
a porosity before infiltration; and
a porosity after drying no more than 1% volume percent of the aluminum-based coating layer less than the porosity before infiltration.