Non-chrome passivation of steel
US8980015B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | May 23, 2008 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Mar 12, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/83
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Chromate free treatments and compositions for applying a conversion or passivation coating to metal surfaces. Preferred compositions comprise a film forming latex polymer, fluoacid, phosphoric acid, and a polyoxyethylene/oxypropylene block copolymer. The requisite metal surfaces are contacted by the compositions and dried. Rinsing is optional.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.