Cobalt chrome etching process
US11053595B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2019 |
| Grant date | Jul 6, 2021 |
| Priority date | — |
| Expiry date | Dec 16, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F1/04
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Compositions and methods for etching cobalt chromium alloys are disclosed. The compositions generally include at least two mineral acids, certain component metals of the alloy to be etched, and optionally iron (Fe). For example, when etching a cobalt chromium molybdenum alloy, the metals may include chromium (Cr), molybdenum (Mo), and optionally, cobalt (Co). The at least two mineral acids may include hydrochloric acid (HCl), nitric acid (HNO3), and hydrofluoric acid (HF). The methods provide for etching an entire surface of a substrate or etching a surface of a substrate in a pattern using selective coating patterns and/or coating removal. Thus, unlimited patterns, as well as etch depths and variations in etch depths are achievable using the compositions and methods disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.