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Reduction of the loss of zinc by its reaction with oxygen in galvanized steel and batteries

a technology of oxygen and zinc, applied in the direction of fuel and primary cells, cell components, manufacturing tools, etc., can solve the problem of reducing the coulombic efficiency of zinc utilization in the cathodic protection of steel

Inactive Publication Date: 2007-06-07
BOARD OF RGT THE UNIV OF TEXAS SYST
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  • Abstract
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Benefits of technology

[0015] It was found that the coulombic efficiency of zinc utilization is highest when the zinc anodes are coated with non-porous or minimally porous hopeite. Minimal porosity and good Zn2+ conductivity are best achieved when the hopeite crystals on the Zn anodes are large but thin, which is the case when the crystals are lamellar. In general, the widths and the lengths of the hopeite lamellae are greater than about 2 micrometers, more preferably they are greater than about 5 micrometers and most preferably they are greater than about 10 micrometers. The ratio of their height, or thickness, to their width or length is less than about ⅓, is preferably less than about ⅕ and is most preferably less than about 1 / 10.

Problems solved by technology

The oxidation of zinc by oxygen is an undesired non-Faradaic reaction, reducing the coulombic efficiency of zinc utilization in the cathodic protection of steel.

Method used

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  • Reduction of the loss of zinc by its reaction with oxygen in galvanized steel and batteries
  • Reduction of the loss of zinc by its reaction with oxygen in galvanized steel and batteries
  • Reduction of the loss of zinc by its reaction with oxygen in galvanized steel and batteries

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Glossary of Terms

[0031] Terms such as “a”, “an” and “the” are not intended to refer to only a singular entity, but include the general class of which a specific example may be used for illustration. The terminology herein is used to describe specific embodiments of the invention, but their usage does not delimit the invention, except as outlined in the claims.

[0032] Bath refers to a solution that directly contacts the substrate. The term “Bath” is not intended as a limitation of the manner of application of coating which generally can be applied to the substrate by various techniques, e.g., nonexclusive examples include immersion, dipping, spraying, placing the substrate into the bath, intermittent spraying, flow coating, and combined methods such as spraying-dipping-spraying, spraying-dipping, dipping-spraying or combinations thereof.

[0033] Electrolyte denotes a usually electronically insulating substance through which an electric current is carried through the motion of ions.

[...

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Abstract

A non-porous Zn2+ conducting inorganic lamellar layer is formed on the zinc coating of galvanized steel or on a zinc anode of an electrochemical cell. The layer reduces the rate of the unwanted chemical reaction of zinc and oxygen but allows desired electrochemical reactions underlying the cathodic protection of the steel and the efficient utilization of zinc anodes in electrochemical cells, e.g., a physiological buffer solution or serum as their electrolytes. The ion conducting non-porous lamellar layer having a hopeite phase Zn3(PO4)2.4H2O may be formed spontaneously on, e.g., NAFION® coated zinc anodes discharged in neutral pH saline phosphate solutions.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to U.S. Provisional Application Ser. No. 60 / 718,158, filed Sep. 15, 2005, the contents of which are incorporated by reference herein in its entirety.[0002] The U.S. Government may own certain rights in this invention pursuant to the terms of the Naval Research Grant (00014-021-1-0144).TECHNICAL FIELD OF THE INVENTION [0003] The present invention relates in general to the prevention or alleviation of loss of zinc in anodes by its reaction with oxygen. The prevention of such loss is of essence for high the utilization efficiency of the zinc in galvanized steel. Here the zinc cathodically protects the steel against corrosion. Protection of metal corrosion is of particular use in batteries with zinc anodes, particularly batteries having small, high surface to volume ratio, zinc anodes. BACKGROUND OF THE INVENTION [0004] Without limiting the scope of the invention, its background is described in view of utili...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25C7/02
CPCB32B15/018C22C18/00C25D17/10H01M4/12H01M4/244H01M4/366H01M8/16H01M12/06Y02E60/124Y02E60/527Y02E60/10Y02E60/50
Inventor HELLER, ADAMSHIN, WOONSUP
Owner BOARD OF RGT THE UNIV OF TEXAS SYST
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