Method of producing metal member with enhanced corrosion resistance by salt bath nitriding
US7217327B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 2, 2003 |
| Grant date | May 15, 2007 |
| Priority date | — |
| Expiry date | May 12, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/52
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A metal member is produced with enhanced corrosion resistance by salt bath nitriding. Specifically, in a nitriding salt bath containing Li+, Na+ and K+ ions as cation components and CNO− and CO3−− ions as anion components and enhanced in oxidizing power by addition of an oxidizing-power-enhancing substance selected from the group consisting of alkali metal hydroxides, bound water, free water and moist air, the metal member is immersed such that an nitrided layer is formed on a surface of the metal member and concurrently, an oxide film is formed on an outermost layer of the nitrided layer. As a subsequent step to the immersion in the nitriding salt bath, the metal member is immersed in a displacement cleansing salt bath which contains an alkali metal nitrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.