Hexavalent chromium-free phosphate-bonded coatings
US6224657A · kind A · utility
23Cited by
13References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1998 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Oct 13, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/60
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A heat curable bonding composition of the present invention comprises an aqueous solution containing phosphate ion (PO.sub.4.sup.-3) and chromium(III) ion (Cr.sup.+3, or trivalent chromium) and is substantially free of hexavalent chromium ions. The bonding composition may further contain at least one secondary cationic species. The bonding composition has a pH in the range of about 1 to about 3.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.