Corrosion resistant metal composite with zinc and chromium coating
US4497876A · kind A · utility
Inventor
Key dates
| Filing date | Mar 16, 1983 |
| Grant date | Feb 5, 1985 |
| Priority date | — |
| Expiry date | Mar 16, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/256
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A metal composite is provided extended corrosion resistance. Prior to joining the metals of the composite, at least one of the metals is provided with a metallic undercoat. This undercoat is then coated with a metallic zinc layer. Lastly, a heat curable and substantially resin free topcoat is established on the zinc layer and cured. The topcoat composition contains chromium in non-elemental form and may further contain particulate metal, all in liquid medium. The metal composite is then formed by contacting metals including the thus coated metal. In addition to outstanding corrosion resistance, the composite can retain substrate weldability while further enhancing weatherability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.