Process for the heat treatment of Al alloys containing Li with a view to preserving their surface health
US4799976A · kind A · utility
3Cited by
2References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1988 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Mar 7, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a process for improving the surface condition of Li-containing Al alloy products. According to the process, heating at a temperature exceeding 300.degree. C. takes place in an atmosphere containing, in volume percent, 5 to 98% CO.sub.2, 2.ltoreq.dry air.ltoreq.95% and the remainder water. The process prevents the appearance of surface pitting and reduces the depth of the Li-depleted surface zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.