Process for the treatment by chemical conversion of substrates of zinc or of one of its alloys, concentrate and bath used for performing this process
US4670066A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1985 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | Aug 15, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/12
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Process for the treatment by chemical conversion, within very short spaces of time of substrates of zinc or of one of its alloys especially of continuously zinc coated steel coils, wherein the bath employed in the phosphatization step proper comprises, besides the conventional constituents, a proportion of 0.3 to 2 g/l of Fe.sup.2+ ions, this bath comprising also from 0.2 to 1.5 g/l, preferably from 0.2 to 1.2 gl/ of Zn.sup.2+ ions and from 0.3 to 2 g/l, preferably from 0.3 to 1.2 g/l of Ni.sup.2+ ions, the weight ratios EQU Zn/Ni and Zn Fe being comprised between 0.1 and 5, these ratios being preferably comprised respectively between 0.4 and 2 and between 0.25 and 4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.