Process for dezincing galvanized steel
Abstract
A process is described 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 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 corrosion rate may be accelerated by (1) increasing the number density of corrosion sites in the galvanized steel by mechanically abrading or deforming the galvanized steel, (2) heating the galvanized steel to form an alloy of zinc on the surface of the galvanized steel, (3) mixing the galvanized steel with a material having a standard electrode potential which is intermediate of the standard electrode potentials of zinc and cadmium in the electrochemical series, or (4) moving the galvanized steel relative to itself and to the electrolyte while immersed in the electrolyte. 1 fig.
- Inventors:
- Issue Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 672500
- Patent Number(s):
- 5779878
- Application Number:
- PAN: 8-680,344
- Assignee:
- Metal Recovery Industries United States Inc., East Chicago, IN (United States)
- DOE Contract Number:
- W-31109-ENG-38
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 14 Jul 1998
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; STEELS; DEMETALLIZATION; ZINC; ELECTROLYSIS; REMOVAL; ELECTROCHEMICAL CELLS; SODIUM HYDROXIDES; POTASSIUM HYDROXIDES
Citation Formats
Morgan, W A, Dudek, F J, and Daniels, E J. Process for dezincing galvanized steel. United States: N. p., 1998.
Web.
Morgan, W A, Dudek, F J, & Daniels, E J. Process for dezincing galvanized steel. United States.
Morgan, W A, Dudek, F J, and Daniels, E J. Tue .
"Process for dezincing galvanized steel". United States.
@article{osti_672500,
title = {Process for dezincing galvanized steel},
author = {Morgan, W A and Dudek, F J and Daniels, E J},
abstractNote = {A process is described 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 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 corrosion rate may be accelerated by (1) increasing the number density of corrosion sites in the galvanized steel by mechanically abrading or deforming the galvanized steel, (2) heating the galvanized steel to form an alloy of zinc on the surface of the galvanized steel, (3) mixing the galvanized steel with a material having a standard electrode potential which is intermediate of the standard electrode potentials of zinc and cadmium in the electrochemical series, or (4) moving the galvanized steel relative to itself and to the electrolyte while immersed in the electrolyte. 1 fig.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 14 00:00:00 EDT 1998},
month = {Tue Jul 14 00:00:00 EDT 1998}
}