WO1997003229B1 - Valve metal electrode - Google Patents
Valve metal electrodeInfo
- Publication number
- WO1997003229B1 WO1997003229B1 PCT/US1996/011382 US9611382W WO9703229B1 WO 1997003229 B1 WO1997003229 B1 WO 1997003229B1 US 9611382 W US9611382 W US 9611382W WO 9703229 B1 WO9703229 B1 WO 9703229B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve metal
- current density
- per square
- square meter
- anode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Abstract
A novel valve metal electrode for use in an electrochemical process at an anodic current density of up to about 215 milliamps per square meter which is particularly suited for use as an anode in the cathodic protection of iron or steel bars embedded as reinforcing elements in a concrete article. The useful lifetime of the electrode at any given anodic current density can be extended by appropriate heat treatment prior to use.
Claims
1. In a cathodic corrosion protection system having at least one
electrode for the cathodic corrosion protection of reinforcement elements
serving as cathodes embedded in concrete comprising:
A) an anode, and
B) a source of direct current,
wherein the improvement comprises:
C) said anode consists of a valve metal
D) said source of direct current is applied so as to produce an
anodic current density of up to about 215 milliamps per square meter.
2. The cathodic corrosion protection system of claim 1 wherein said
valve metal anode is formed of a metal selected from the group consisting
of titanium, tantalum, zirconium, niobium, and mixtures thereof and said
anodic current density is about 1 to about 160 milliamps per square meter.
3. The cathodic corrosion protection system of claim 2 wherein said
valve metal anode is an expanded metal or woven metal mesh, said metal is titanium, and said anodic current density is about 1 to about 110 milliamps
per square meter.
4. In a cathodic corrosion protection system for the corrosion
protection of reinforcement elements embedded in concrete comprising valve
metal anodes, reinforcement elements, and a source of direct current
connected to said reinforcement elements and to said valve metal anodes,
said reinforcement elements serving as cathodes, the improvement wherein
said anodes consist of a valve metal and the current density on said anodes
is maintained at an anodic current density of up to about 215 milliamps per
square meter.
5. The cathodic protection system of claim 4 wherein said
reinforcement elements comprise iron or alloys thereof, said valve metal
anode is formed of a metal selected from the group consisting of titanium,
tantalum, zirconium, niobium, and mixtures thereof and said anodic current
density is about 1 to about 160 milliamps per square meter.
6. The cathodic protection system of claim 5 wherein said valve
metal anode is embedded in concrete or arc sprayed upon a surface of said
concrete, said valve metal is titanium, and said current density is about 1 to
about 110 milliamps per square meter.
7. A process for the preparation of an electrode consisting of a
valve metal for use in an electrochemical process at an anodic current
density of up to about 215 milliamps per square meter wherein said valve
metal prior to use is conditioned by heating at a temperature of about 250°C
to about 750°C.
8. The process of claim 7 wherein said valve metal electrode is
utilized as an anode in a cathodic corrosion protection system for the
corrosion protection of reinforcement elements embedded in concrete, said
reinforcement elements serving as cathodes wherein said valve metal
electrode is conditioned by heating for a time of about 3 minutes to about
5 hours.
9. The process of claim 8 wherein said reinforcement elements
comprise iron or alloys thereof, said valve metal electrode is formed of a
metal selected from the group consisting of titanium, tantalum, zirconium,
niobium, and mixtures thereof and said anodic current density is about 1 to
about 160 milliamps per square meter.
10. The process of claim 9 wherein said valve metal anode is formed
of titanium and said current density is about 1 to about 110 milliamps per
square meter.
11. A method of preventing corrosion of reinforcement elements
embedded in concrete by use of a cathodic protection system in which said
reinforcement elements serve as cathodes and a source of direct current is
connected to said cathodes and to anodes consisting of a valve metal wherein
the current density on said anode is maintained at an anodic current density
of up to about 215 milliamps per square meter.
12. The method of claim 11 wherein said valve metal anode is
formed of a metal selected from the group consisting of titanium, tantalum,
zirconium, niobium, and mixtures thereof and said anodic current density is
about 1 to about 160 milliamps per square meter.
13. The method of claim 12 wherein said valve metal anode is an
expanded metal or woven metal mesh, said valve metal is titanium, and said
anodic current density is about 1 to about 110 milliamps per square meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU66750/96A AU711254B2 (en) | 1995-07-13 | 1996-07-01 | Valve metal electrode |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US50224895A | 1995-07-13 | 1995-07-13 | |
| US08/502,248 | 1995-07-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1997003229A1 WO1997003229A1 (en) | 1997-01-30 |
| WO1997003229B1 true WO1997003229B1 (en) | 1997-02-13 |
Family
ID=23996978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1996/011382 Ceased WO1997003229A1 (en) | 1995-07-13 | 1996-07-01 | Valve metal electrode |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU711254B2 (en) |
| CA (1) | CA2226971A1 (en) |
| WO (1) | WO1997003229A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2804409A (en) * | 1956-02-06 | 1957-08-27 | Titanium Metals Corp | Heat treating titanium-base alloy products |
| US3846188A (en) * | 1972-06-09 | 1974-11-05 | Mc Donnell Douglas Corp | Method for stabilizing titanium alloys against hydrogen pickup and stabilized titanium alloy produced thereby |
| GB1433800A (en) * | 1973-12-27 | 1976-04-28 | Imi Refinery Holdings Ltd | Method of and anodes for use in electrowinning metals |
| US3907659A (en) * | 1974-04-04 | 1975-09-23 | Holmers & Narver Inc | Composite electrode and method of making same |
| US5421968A (en) * | 1985-05-07 | 1995-06-06 | Eltech Systems Corporation | Cathodic protection system for a steel-reinforced concrete structure |
| US5080671A (en) * | 1987-11-25 | 1992-01-14 | Uri Oron | Method of treating a metal prosthetic device prior to surgical implantation to enhance bone growth relative thereto following implantation |
| JPH02213487A (en) * | 1988-12-26 | 1990-08-24 | Japan Metals & Chem Co Ltd | Manufacture of electrolytic manganese dioxide |
| US4997492A (en) * | 1990-06-08 | 1991-03-05 | Nippon Mining Co., Ltd. | Method of producing anode materials for electrolytic uses |
-
1996
- 1996-07-01 WO PCT/US1996/011382 patent/WO1997003229A1/en not_active Ceased
- 1996-07-01 CA CA 2226971 patent/CA2226971A1/en not_active Abandoned
- 1996-07-01 AU AU66750/96A patent/AU711254B2/en not_active Ceased
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