Process adapted to provide on a metallic substrate a protective coating based on hexavalent chromium, bath used in the said process and commercial form of the components of the bath
US5259884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1990 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | Nov 6, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/74
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Process comprising PA1 a step for the preparation of the metallic substrate by degreasing, possibly followed by mechanical or chemical pickling, PA1 a step comprising the use by immersion or spraying of a bath adapted to provide on the metallic substrate the contemplated protective coating and PA1 a curing step at high temperature, PA1 and characterized by the fact that the above-mentioned bath comprises at least: PA2 a metal in the form of particles, PA2 chromic acid and/or one of its derivatives as oxidizing agent, PA2 at least one hydrosoluble solvent having a high boiling point and selected from those of the aprotic polar type and of the ketonic type, PA2 water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.