Surface treatment method and coating method for steel material, and method for producing machine component
US9752225B2 · kind B2 · utility
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3References
13Claims
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Key dates
| Filing date | Sep 12, 2012 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Nov 21, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/83
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
This surface treatment method comprises a rustproofing step, a rinsing step, and a cleaning step. In the rustproofing step, a rustproofing liquid containing orthophosphoric acid and an organic acid is used to perform a rustproofing treatment on the surface of a steel material. In the rinsing step, a treatment liquid containing an oxo acid salt of a transition metal is used to perform a rinsing treatment on the surface of the steel material. In the cleaning step, the surface of the steel material that has undergone the rinsing step is subjected to a cleaning treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.