Metals having phosphate protective films
US6066403A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1997 |
| Grant date | May 23, 2000 |
| Priority date | — |
| Expiry date | Dec 15, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Novel metallic bodies are provided which present an essentially oxide-free surface protected by phosphate groups which directly and chemically bond to surface metal atoms. Metal surfaces such as Al or Fe can be protected by deposition of a phosphate film directly onto etched metal surfaces without intermediate naturally occurring oxides between the metal ions and protective phosphate groups. Preferably, metallic surfaces to be protected are first etched to remove oxides and other contaminants, followed by electrochemical treatment with a phosphate electrolyte to generate a protective film having a thickness of from about 20-100 .ANG. which is stable in ambient air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.