Enhanced activation of self-passivating metals
US11473183B2 · kind B2 · utility
3Cited by
15References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2020 |
| Grant date | Oct 18, 2022 |
| Priority date | — |
| Expiry date | Aug 10, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/32
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A workpiece made from a self passivating metal and having one or more surface regions defining a Beilby layer as a result of a previous metal shaping operation is activated for subsequent low temperature gas hardening by exposing the workpiece to the vapors produced by heating an oxygen-free nitrogen halide salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.