US 12,351,922 B2
Roughening treatment method for stainless steel surface, method for manufacturing roughened stainless steel, and aqueous composition used in said methods
Kazuhiko Ikeda, Kanagawa (JP); Tomoko Fujii, Tokyo (JP); and Hiroshi Matsunaga, Yokkaichi (JP)
Assigned to MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo (JP)
Appl. No. 18/266,624
Filed by MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo (JP)
PCT Filed Dec. 13, 2021, PCT No. PCT/JP2021/045737
§ 371(c)(1), (2) Date Jun. 12, 2023,
PCT Pub. No. WO2022/131187, PCT Pub. Date Jun. 23, 2022.
Claims priority of application No. 2020-207186 (JP), filed on Dec. 15, 2020.
Prior Publication US 2024/0044014 A1, Feb. 8, 2024
Int. Cl. C23F 1/28 (2006.01)
CPC C23F 1/28 (2013.01) 18 Claims
OG exemplary drawing
 
1. A roughening treatment method for roughening a surface of stainless steel, the method comprising:
roughening the surface of the stainless steel that contains copper or a metal having an ionization tendency larger than copper by contacting a first aqueous composition with the surface of the stainless steel in a roughening treatment, and
performing a post-treatment by contacting, under an acidic condition, a second aqueous composition comprising a peroxide with the surface of the stainless steel that has been roughened in the roughening treatment,
wherein the first aqueous composition comprises, based on a total amount of the first aqueous composition:
0.1% to 20% by mass of hydrogen peroxide;
0.25% to 40% by mass of copper ions; and
1% to 30% by mass of halide ions.