Roughening treatment method for stainless steel surface, method for manufacturing roughened stainless steel, and aqueous composition used in said methods
US12351922B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2021 |
| Grant date | Jul 8, 2025 |
| Priority date | — |
| Expiry date | May 31, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01M4/669
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The problem of the present invention is to provide a roughening treatment method in which the surface of stainless steel is sufficiently roughened in an efficient manner with few steps, while maintaining good surface quality of the stainless steel after treatment. The above problem is solved by a roughening treatment method for stainless steel, which comprises a roughening treatment step that uses a first aqueous composition, and a post-treatment step that uses a second aqueous composition. Namely, the roughening treatment step is to roughen the surface of stainless steel containing copper or a metal having an ionization tendency larger than copper by bringing the first aqueous composition into contact with the surface, wherein the first aqueous composition comprises 0.1% to 20% by mass of hydrogen peroxide based on the total amount of the first aqueous composition, 0.25% to 40% by mass of copper ions based on the total amount of the first aqueous composition, and 1% to 30% by mass of halide ions based on the total amount of the first aqueous composition, wherein the post-treatment step is to perform a post-treatment by bringing the second aqueous composition into contact, under ac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.