Surface treatment method for metal material and mold treated by surface treatment method
US9644255B2 · kind B2 · utility
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Key dates
| Filing date | Apr 12, 2012 |
| Grant date | May 9, 2017 |
| Priority date | — |
| Expiry date | Jul 9, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/26
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A surface treatment method for a metal material is provided which includes applying diluted sulfuric acid to a surface of the metal material that is composed primarily of iron, performing a heat treatment on the metal material in the presence of at least one of CO, CO2 and organic gas under nitriding conditions under which a nitrided layer is formed in a superficial layer of the metal material after the application of the diluted sulfuric acid to form a carbon film which includes at least one of carbon nanocoils, carbon nanotubes and carbon nanofilaments on a surface of the nitrided layer of the metal material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.