Transition metal salt compositions that eliminate hydrogen absorption and enhance hydrogen degassing of metal and metal alloys
US5985059A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1998 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Mar 17, 2018 |
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 a metal or metal alloy workpiece during heat treatments in furnaces with ambient and/or moisture-laden atmospheres, the method includes exposing the surface of the workpiece 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 said heat-treatment, said transition metal cation having an equal or positive standard reduction half-reaction potential relative to metal or metal alloy workpiece, the workpiece exposed to the acidified transition metal sulfate, phosphate or nitrate salt is subjected to a heat treatment. The acidified transition metal sulfate, phosphate or nitrate salt is used to substantially decrease the amount of atomic hydrogen entering the bulk of the workpiece during heat treatment and to facilitate removal of atomic and molecular hydrogen from the bulk of the metal or metal alloy workpiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.