Composition and process for treating metal
US5356490A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1993 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Oct 5, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/34
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Heating an aqueous mixture of a fluoroacid such as H.sub.2 TiF.sub.6 and an oxide, hydroxide, and/or carbonate such as silica produces a clear mixture with long term stability against settling of any solid phase, even when the oxide, hydroxide, or carbonate phase before heating was a dispersed solid with sufficiently large particles to scatter light and make the mixture before heating cloudy. The clear mixture produced by heating can either be mixed with water soluble and/or water dispersible polymers, for example with dispersed polymers of the diglycidyl ether of bisphenol-A or an acrylic acid polymer, or with soluble hexavalent and/or trivalent chromium, to produce a composition that improves the corrosion resistance of metals treated with the composition, especially after subsequent painting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.