Corrosion resistant metallate compositions
US9347134B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 2010 |
| Grant date | May 24, 2016 |
| Priority date | — |
| Expiry date | Feb 23, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/83
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A composition for application to a metal substrate comprising at least one metallate compound comprising hexafluorzirconate, zirconyl nitrate, and/or yttrium nitrate is provided. The composition may further comprise additives that promote corrosion resistance of the metal substrate, or the adhesion of subsequent coatings, such as one or more rare earth element salts; allontoin, polyvinylpyrrolidone, surfactants, and other additives and co-inhibitors. A metal substrate such as an aluminum or an aluminum alloy substrate coated with a metallate composition according to the present invention is also provided. A process for preparing a coating on a metal substrate to improve the corrosion resistance of the substrate or improve the adhesion of a subsequent coating is also provided. The process comprises treating the metal substrate with an aqueous solution comprising a metallate compound. The process may further comprise one or more pre-treating the substrate, coating the metal substrate with an oxidizing agent and/or coating the metal substrate with one or more rare earth element salts. A process for preparing the metallate coatings of the invention is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.