US 12,486,579 B2
Systems and methods for treating a metal substrate
Eric L. Morris, Murrieta, CA (US)
Assigned to PRC-DeSoto International, Inc., Sylmar (CA)
Appl. No. 16/965,938
Filed by PRC-DeSoto International, Inc., Sylmar, CA (US)
PCT Filed Jan. 30, 2019, PCT No. PCT/US2019/015911
§ 371(c)(1), (2) Date Jul. 29, 2020,
PCT Pub. No. WO2019/152556, PCT Pub. Date Aug. 8, 2019.
Claims priority of provisional application 62/623,735, filed on Jan. 30, 2018.
Prior Publication US 2021/0040621 A1, Feb. 11, 2021
Int. Cl. C23C 22/30 (2006.01); C23C 22/36 (2006.01); C23C 22/73 (2006.01); C23C 22/83 (2006.01); C23G 1/22 (2006.01); C23C 22/78 (2006.01)
CPC C23C 22/361 (2013.01) [C23C 22/73 (2013.01); C23C 22/83 (2013.01); C23G 1/22 (2013.01); C23C 2222/10 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A system for treating a metal substrate comprising:
a conversion composition for application to a portion of a surface of the metal substrate, the conversion composition comprising a permanganate anion in an amount of 0.1 g/L to 1 g/L based on total weight of the conversion composition; and
a sealing composition for application to the portion of the surface of the metal substrate following application of the conversion composition, the sealing composition comprising a trivalent chromium cation in an amount of at least 0.01 g/L and no more than 1.0 g/L based on total weight of the sealing composition and a transition metal cation in addition to the trivalent chromium cation in an amount of 0.05 g/L to 5 g/L based on total weight of the sealing composition;
wherein the system excludes a treatment composition for application to the portion of the metal substrate following application of the conversion composition and prior to the sealing composition.