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Title: 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):
5,779,878
Application Number:
PAN: 8-680,344
Assignee:
Metal Recovery Industries United States Inc., East Chicago, IN (United States) PTO; SCA: 320303; PA: EDB-98:119165; SN: 98002024839
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 = {1998},
month = {7}
}