US 12,129,556 B2
Chemical activation of self-passivating metals
Cyprian Adair William Illing, Cleveland Heights, OH (US); Peter C. Williams, Cleveland Heights, OH (US); Christina Semkow, University Heights, OH (US); and Todd Johns, Solon, OH (US)
Assigned to SWAGELOK COMPANY, Solon, OH (US)
Filed by SWAGELOK COMPANY, Solon, OH (US)
Filed on Dec. 4, 2020, as Appl. No. 17/112,076.
Claims priority of provisional application 63/076,425, filed on Sep. 10, 2020.
Claims priority of provisional application 63/017,265, filed on Apr. 29, 2020.
Claims priority of provisional application 63/017,271, filed on Apr. 29, 2020.
Claims priority of provisional application 63/017,259, filed on Apr. 29, 2020.
Claims priority of provisional application 63/017,262, filed on Apr. 29, 2020.
Claims priority of provisional application 62/922,241, filed on Dec. 6, 2019.
Prior Publication US 2021/0172046 A1, Jun. 10, 2021
Int. Cl. C23C 8/22 (2006.01); C21D 1/06 (2006.01); C23C 8/26 (2006.01); C23C 8/30 (2006.01); C23C 8/32 (2006.01)
CPC C23C 8/22 (2013.01) [C21D 1/06 (2013.01); C23C 8/26 (2013.01); C23C 8/30 (2013.01); C23C 8/32 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for treating a workpiece made from a self-passivating metal and having a Beilby layer comprising:
nitrocarburizing the workpiece, wherein the nitrocarburizing consists of
exposing the workpiece to vapors produced by heating a reagent having a guanidine [HNC(NH2)2] moiety and complexed with HCl for a time period of 1 to 5 minutes.