Process for dezincing galvanized steel using an electrically isolated conveyor
US6258248A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1998 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Nov 24, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25F5/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process for removing zinc from galvanized steel. The galvanized steel is immersed in an electrolyte containing at least about 15% by weight of sodium or potassium hydroxide and having a temperature of at least about 75.degree. C. and the zinc is galvanically corroded from the surface of the galvanized steel. The material serving as the cathode is principally a material having a standard electrode potential which is intermediate of the standard electrode potentials of zinc and cadmium in the electrochemical series. The steel scrap is carried through the electrolyte by a conveyor which is electrically isolated from ground and which comprises a cathodic material which has a standard electrode potential which is intermediate of the standard electrode potentials of zinc and cadmium in the electrochemical series.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.