Aqueous electrodeposition bath based on chlorides for preparation of a coat based on zinc or zinc alloy
US6153079A · kind A · utility
4Cited by
5References
9Claims
0Family size
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Key dates
| Filing date | Jun 26, 1998 |
| Grant date | Nov 28, 2000 |
| Priority date | — |
| Expiry date | Jun 26, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D3/565
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A bath of pH higher than 4 containing more than 1 mole/liter of Zn.sup.++ ions and at least one polyethylene glycol polymer of the general formula R.sup.1 --O(CH.sub.2 --CH.sub.2 --O).sub.n --R.sup.2, in which n.ltoreq.13 and in which the concentration of polymer in the bath is adapted to incorporate in the coat an organic compound having a content by weight greater than 0.1%, expressed as weight of carbon per unit weight of the coat. The bath is adapted to high current densities, and the coat applied on the steel sheet imparts both a leveling effect and an improvement of corrosion resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.