Transition metal salt compositions that eliminate hydrogen absorption and enhance hydrogen degassing of aluminum
US5753056A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1996 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Nov 25, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D3/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of controlling bulk absorption of atomic hydrogen and facilitating degassing of hydrogen from aluminum alloy workpieces during heat treatment in furnaces with ambient and/or moisture-laden atmospheres. The method includes exposing the surface of the workpieces to an acidified inorganic salt solution or dispersion, with the inorganic salt of the solution containing a transition metal cation and a sulfate, phosphate or nitrate anion, before being subjected to the heat treatment. The workpieces are next subjected to the heat treatment, and the acidified transition metal sulfate, phosphate or nitrate salt is used to substantially decrease the amount of atomic hydrogen entering the respective bulks of the workpiece during heat treatment and to facilitate removal of atomic and molecular hydrogen from the bulks of the workpieces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.