	US 11,746,294 B2
	Corrosion control using organic filmers and passivators in systems for processing nitrogen-containing solutions
Rajendra Prasad Kalakodimi, Glen Allen, VA (US); Santanu Banerjee, Glen Allen, VA (US); and Jared Andrew Green, Owasso, OK (US)
Assigned to ChemTreat, Inc., Glen Allen, VA (US)
Filed by CHEMTREAT, INC., Glen Allen, VA (US)
Filed on May 28, 2021, as Appl. No. 17/334,351.
Prior Publication US 2022/0389315 A1, Dec. 8, 2022
Int. Cl. C23F 11/18 (2006.01); C23F 11/167 (2006.01); C23F 11/12 (2006.01); C09K 15/06 (2006.01); C09K 15/02 (2006.01)

CPC C09K 15/06 (2013.01) [C09K 15/02 (2013.01); C23F 11/124 (2013.01); C23F 11/167 (2013.01); C23F 11/184 (2013.01); C23F 11/185 (2013.01)]

13 Claims

1. A method of inhibiting corrosion of a corrodible metal surface that contacts a nitrogen-containing solution including elemental nitrogen in a range of 28 to 34% by wt %, the method comprising:

adding a chemical treatment composition to the nitrogen-containing solution that includes an organic filmer and a passivator,

wherein the organic filmer includes a hydroxycarboxylic acid selected from the group consisting of tartaric acid and glycolic acid, and

the treatment composition is provided in a sufficient amount and for a sufficient time to form a stable protective film on at least a portion of the corrodible metal surface.