Method for surface treatment of a steel component by nitriding or nitrocarburising, oxidising and then impregnating
US10774414B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2015 |
| Grant date | Sep 15, 2020 |
| Priority date | — |
| Expiry date | Dec 8, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D1/06
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed is a method for surface treatment of a steel component, providing high resistance to wear and corrosion, including nitriding or nitrocarburising to form a compound layer with a thickness of at least 8 micrometers made up of iron nitrides having phases ε and/or γ′, oxidizing to generate a layer of oxides with a thickness of 0.1-3 micrometers, and soaking in an impregnation bath during at least 5 minutes at room temperature, the bath being made up of at least 70 wt %, ±1%, of a solvent made up of a mixture of hydrocarbons formed by a C9 to C17 alkane fraction, 10 to 30 wt %, ±1%, of at least one paraffin oil formed by a C16 to C32 alkane fraction, and at least one additive such as a synthetic phenolic additive with a concentration of 0.01 to 3 wt %, ±0.1%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.