US 12,416,084 B2
Coating-free antimicrobial stainless steel surfaces
Jin Hu, Hudson, OH (US)
Assigned to GOODRICH CORPORATION, Charlotte, NC (US)
Filed by Goodrich Corporation, Charlotte, NC (US)
Filed on Dec. 27, 2021, as Appl. No. 17/562,194.
Prior Publication US 2023/0203666 A1, Jun. 29, 2023
Int. Cl. C23C 22/06 (2006.01); C22C 38/18 (2006.01); C23C 22/50 (2006.01); C23C 22/78 (2006.01)
CPC C23C 22/06 (2013.01) [C22C 38/18 (2013.01); C23C 22/78 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of manufacturing a stainless steel component, the method comprising:
texturizing a stainless steel substrate by bead blasting to provide a texturized stainless steel, the stainless steel substrate comprising grade 316 austenitic stainless steel;
treating the texturized stainless steel with a passivation solution to provide a passivated stainless steel;
treating the passivated stainless steel with an oxidizing solution comprising sulfuric acid and hydrogen peroxide at a temperature of about 130 to about 200 degrees Fahrenheit for at least 50 minutes to provide an antimicrobial stainless steel surface that is free of a separate coating; and
obtaining at least 99.9% E. coli reduction as measured by JIS Z 2801:2010 test on the antimicrobial stainless steel without a separate coating.