Chromium-zinc anti-tarnish coating for copper foil
US5230932A · kind A · utility
15Cited by
33References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1992 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Mar 20, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12903
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A technique for improving the tarnish and oxidation resistance of copper and copper based ally material is disclosed. The material is electrolytically coated by immersion in an aqueous electrolyte containing sodium hydroxide, zinc ions and chromium (VI) ions. The deposited coating is a codeposited layer of zinc and chromium with a zinc to chromium ratio of from about 5:1 to about 12:1. The coating provides tarnish resistance at temperatures in excess of 190.degree. C. and is removable by immersion in sulfuric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.