Composite zinc-silica electro-galvanized steel sheet excellent in corrosion resistance
US4839241A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1988 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Apr 20, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12799
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A composite zinc-silica electro-galvanized steel sheet excellent in corrosion resistance, having on at least one surface thereof a zinciferous plating layer, preferably in an amount of from 5 to 100 g/m.sup.2 per side thereof, into which silica particles are dispersed. The above-mentioned plating layer consists essentially of: PA1 silica particles: from 0.1 to 20 wt. %, PA1 nitrogen compounds: from 0.0005 to 0.5 wt. % as converted into nitrogen, and the balance being zinc and incidental impurities. The above-mentioned plating layer further additionally contains as required at least one element selected from the group consisting of: PA1 iron: from 2 to 80 wt. %, PA1 nickel: from 2 to 25 wt. %, PA1 cobalt: from 0.1 to 5 wt. %, and PA1 chromium: from 0.5 to 20 wt. %. The total amount of the above-mentioned at least one element thus additionally contained is limited to up to 80 wt. %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.