EP1918393A2 - Alloy for use in galvanic protection - Google Patents
Alloy for use in galvanic protection Download PDFInfo
- Publication number
- EP1918393A2 EP1918393A2 EP06124232A EP06124232A EP1918393A2 EP 1918393 A2 EP1918393 A2 EP 1918393A2 EP 06124232 A EP06124232 A EP 06124232A EP 06124232 A EP06124232 A EP 06124232A EP 1918393 A2 EP1918393 A2 EP 1918393A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- per cent
- anode
- minus
- plus
- cathode
- 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.)
- Granted
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/12—Electrodes characterised by the material
- C23F13/14—Material for sacrificial anodes
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
- C23F2213/31—Immersed structures, e.g. submarine structures
Definitions
- the present invention relates to an alloy used in the galvanic protection of non metallic water vessels.
- the present invention seeks, therefore, among other things, to provide an alloy which overcomes some of the above mentioned disadvantages.
- An alloy which comprises from 0.30 to 0.6 per cent silicon plus or minus 5 per cent, 0.1 to 0.30 per cent iron plus or minus 5 per cent, 0.10 copper plus or minus 5 per cent, 0.10 per cent manganese plus or minus 5 per cent, 0.35 to 0.6 per cent magnesium plus or minus 5 per cent, 0.05 per cent chromium plus or minus 5 per cent, 0.15 per cent zinc plus or minus 5 per cent, 0.10 per cent titanium plus or minus 5 per cent, 0.05 maximum individual trace metals plus or minus 5 per cent, 0.15 per cent total trace metals plus or minus 5 per cent and the balance aluminium.
- Figure 1 is a schematic side elevation of an anode formed of the alloy of the present invention.
- the metallic components of a water vessel with a non-metallic hull are protected by connecting the alloy of the present invention and the metallic components of the water vessel to form an electrochemical cell.
- This electrochemical cell is created through the electrical connection of an anode formed of the alloy the present invention to a cathode which are the metallic components of a vessel.
- the cathode and the anode are both located in a bridging medium. The connection of the anode and the cathode in this way allows for the passage of electrons from the anode to the cathode. These electrons are generated through oxidation of species at the anode and reduction of species at the cathode.
- a galvanic protection system the physical integrity of the anode is sacrificed in order to maintain the physical integrity of the cathode.
- the physical integrity of the anode is sacrificed through the dissolution of the anode into the bridging medium.
- the suitability of the anode for galvanic protection is determined by the electrochemical potential of the anode compared to the cathode and the capacity of the anode to protect the cathode.
- the alloy forming the anode has a chemical composition comprising 0.30 to 0.6 per cent silicon plus or minus 5 per cent, 0.1 to 0.30 per cent iron plus or minus 5 per cent, 0.10 copper plus or minus 5 per cent, 0.10 per cent manganese plus or minus 5 per cent, 0.35 to 0.6 per cent magnesium plus or minus 5 per cent, 0.05 per cent chromium plus or minus 5 per cent, 0.15 per cent zinc plus or minus 5 per cent, 0.10 per cent titanium plus or minus 5 per cent, 0.05 maximum individual trace metals plus or minus 5 per cent, 0.15 per cent total trace metals plus or minus 5 per cent with the balance being aluminium.
- the anode formed of the alloy of the present invention has an electrochemical potential more negative than that of the cathode, preferably with an electrochemical potential in the range of -500 to -1200 mV, more preferably with an electrochemical potential in the range of -500 to -1100 mV,
- the capacity of the anode to protect the cathode may be in the range of 1000 to 2000 Ah/kg, preferably in the range of 1400 to 1700 Ah/kg.
- the surface area of the anode 10 shown in Figure 1 is increased through the incorporation of ridges 12 on the surface of the anode.
- the surface area ratio of the anode to the cathode may be in the range of 1:1 to 1:20, preferably in the range of 1:2 to 1:20.
- the electrical connection provides a passage for the flow of electrons between the cathode and the anode.
- the electrical connection is preferably a metallic wire, more preferably a copper wire.
- the bridging medium provides a passage for the flow of electrons between the anode and the cathode.
- the bridging medium is preferably an aqueous solution, more preferably saltwater, particularly sea water.
- seawater as a bridging medium may be replaced with another suitable aqueous liquid, preferably brackish water or fresh water.
- the anode may be connected to the metallic components of the vessel using known techniques such as connecting the anode to the shaft gland/ seal and, or shaft support bracket and, or the rudder and, or the trimtabs through a bonding buss bar/ system via bonding wire.
- the anode of the present invention is particularly envisaged for use with water vessels with fibreglass or wooden hulls,
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
- The present invention relates to an alloy used in the galvanic protection of non metallic water vessels.
- In the marine industry the prevention of corrosion of components, such as metal fasteners, shaft and propeller components, constructed from stainless steel and bronze alloys is a primary concern. In aerated marine environments these materials are susceptible to crevice and pitting corrosion. Sacrificial anodes are commonly employed to provide cathodic protection to these components. Application of these sacrificial anodes on wooden and fibreglass vessels can result in an over protection, which may result in a reduced life of coatings and an enhanced level of marine growth and wood rot.
- The present invention seeks, therefore, among other things, to provide an alloy which overcomes some of the above mentioned disadvantages.
- An alloy which comprises from 0.30 to 0.6 per cent silicon plus or minus 5 per cent, 0.1 to 0.30 per cent iron plus or minus 5 per cent, 0.10 copper plus or minus 5 per cent, 0.10 per cent manganese plus or minus 5 per cent, 0.35 to 0.6 per cent magnesium plus or minus 5 per cent, 0.05 per cent chromium plus or minus 5 per cent, 0.15 per cent zinc plus or minus 5 per cent, 0.10 per cent titanium plus or minus 5 per cent, 0.05 maximum individual trace metals plus or minus 5 per cent, 0.15 per cent total trace metals plus or minus 5 per cent and the balance aluminium.
- In the drawing there is shown Figure 1 which is a schematic side elevation of an anode formed of the alloy of the present invention.
- In a preferred embodiment of the present invention the metallic components of a water vessel with a non-metallic hull are protected by connecting the alloy of the present invention and the metallic components of the water vessel to form an electrochemical cell. This electrochemical cell is created through the electrical connection of an anode formed of the alloy the present invention to a cathode which are the metallic components of a vessel. The cathode and the anode are both located in a bridging medium. The connection of the anode and the cathode in this way allows for the passage of electrons from the anode to the cathode. These electrons are generated through oxidation of species at the anode and reduction of species at the cathode.
- In a galvanic protection system the physical integrity of the anode is sacrificed in order to maintain the physical integrity of the cathode. The physical integrity of the anode is sacrificed through the dissolution of the anode into the bridging medium. The suitability of the anode for galvanic protection is determined by the electrochemical potential of the anode compared to the cathode and the capacity of the anode to protect the cathode.
- The alloy forming the anode has a chemical composition comprising 0.30 to 0.6 per cent silicon plus or minus 5 per cent, 0.1 to 0.30 per cent iron plus or minus 5 per cent, 0.10 copper plus or minus 5 per cent, 0.10 per cent manganese plus or minus 5 per cent, 0.35 to 0.6 per cent magnesium plus or minus 5 per cent, 0.05 per cent chromium plus or minus 5 per cent, 0.15 per cent zinc plus or minus 5 per cent, 0.10 per cent titanium plus or minus 5 per cent, 0.05 maximum individual trace metals plus or minus 5 per cent, 0.15 per cent total trace metals plus or minus 5 per cent with the balance being aluminium.
- The anode formed of the alloy of the present invention has an electrochemical potential more negative than that of the cathode, preferably with an electrochemical potential in the range of -500 to -1200 mV, more preferably with an electrochemical potential in the range of -500 to -1100 mV,
- The capacity of the anode to protect the cathode may be in the range of 1000 to 2000 Ah/kg, preferably in the range of 1400 to 1700 Ah/kg.
- The surface area of the
anode 10 shown in Figure 1 is increased through the incorporation ofridges 12 on the surface of the anode. The surface area ratio of the anode to the cathode may be in the range of 1:1 to 1:20, preferably in the range of 1:2 to 1:20. - The electrical connection provides a passage for the flow of electrons between the cathode and the anode. The electrical connection is preferably a metallic wire, more preferably a copper wire.
- The bridging medium provides a passage for the flow of electrons between the anode and the cathode. The bridging medium is preferably an aqueous solution, more preferably saltwater, particularly sea water.
- By applying an excess negative electrochemical potential applied across the cell the accumulation of excess calcium deposits, wood rot and paint disbondment may be prevented. This excess negative electrochemical potential is applied across the cell due to the differences in the electrochemical potential of the anode and the cathode.
- In an alternative embodiment of the invention, seawater as a bridging medium may be replaced with another suitable aqueous liquid, preferably brackish water or fresh water.
- The anode may be connected to the metallic components of the vessel using known techniques such as connecting the anode to the shaft gland/ seal and, or shaft support bracket and, or the rudder and, or the trimtabs through a bonding buss bar/ system via bonding wire.
- The anode of the present invention is particularly envisaged for use with water vessels with fibreglass or wooden hulls,
- Modifications or variations as would be apparent to a skilled addressee are deemed to be within the scope of the present invention.
Claims (12)
- An alloy which comprises from 0.30 to 0.6 per cent silicon plus or minus 5 per cent, 0.1 to 0.30 per cent iron plus or minus 5 per cent, 0.10 copper plus or minus 5 per cent, 0.10 per cent manganese plus or minus 5 per cent, 0.35 to 0.6 per cent magnesium plus or minus 5 per cent, 0.05 per cent chromium plus or minus 5 per cent, 0.15 per cent zinc plus or minus 5 per cent, 0.10 per cent titanium plus or minus 5 per cent, 0.05 maximum individual trace metals plus or minus 5 per cent, 0.15 per cent total trace metals plus or minus 5 per cent and the balance aluminium.
- An anode formed of an alloy according to claim 1.
- An anode as according to claim 2, wherein the electrochemical potential of the anode is more negative than that of the cathode.
- An anode as according to claim 3, wherein the electrochemical potential of the anode is in the range of-500 to -1200 mV.
- An anode as according to claim 4, wherein the electrochemical potential of the anode is in the range of -500 to -1100 mV,
- An anode as according to any of the claims 2 to 5, wherein the capacity of the anode to protect the physical integrity of the cathode is in the range of 1000 to 2000 Ah/kg.
- An alloy as according to claim 6, wherein the capacity of the anode to protect the physical integrity of the cathode is in the range of 1400 to 1700 Ah/kg.
- An anode as according to any of the claims 2 to 7, for use in the galvanic protection of water vessels with non-metallic hulls.
- An anode as according to claim 8, wherein the vessel is designed for use in seawater.
- An anode as according to any of the claims 2 to 9, wherein the surface area ratio of the anode to the cathode in the electrochemical cell is in the range of 1:1 to 1:20.
- An anode as according to claim 10, wherein the surface area ratio of the anode to the cathode is in the range of 1:2 to 1:20.
- An anode as according to any of the claims 2 to 11, characterised in that an excess negative electrochemical potential is applied across the electrochemical cell.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2006235903A AU2006235903B2 (en) | 2006-11-03 | 2006-11-03 | Alloy for use in galvanic protection |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1918393A2 true EP1918393A2 (en) | 2008-05-07 |
EP1918393A3 EP1918393A3 (en) | 2009-01-28 |
EP1918393B1 EP1918393B1 (en) | 2011-06-22 |
Family
ID=37890999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06124232A Not-in-force EP1918393B1 (en) | 2006-11-03 | 2006-11-16 | Alloy for use in galvanic protection |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080107560A1 (en) |
EP (1) | EP1918393B1 (en) |
AT (1) | ATE513933T1 (en) |
AU (1) | AU2006235903B2 (en) |
CA (1) | CA2567681A1 (en) |
NO (1) | NO20065162L (en) |
NZ (1) | NZ551262A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105256178A (en) * | 2015-10-29 | 2016-01-20 | 无锡市嘉邦电力管道厂 | Corrosion resisting aluminum alloy and preparing method thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3368952A (en) * | 1964-05-18 | 1968-02-13 | Olin Mathieson | Alloy for cathodic protection galvanic anode |
JP2002097539A (en) * | 2000-09-25 | 2002-04-02 | Nakabohtec Corrosion Protecting Co Ltd | Aluminum alloy for galvanic anode in low-temperature seawater environment |
KR20050067605A (en) * | 2003-12-29 | 2005-07-05 | 주식회사 삼공사 | Aluminum alloy for galvanic anode |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3496620A (en) * | 1966-11-07 | 1970-02-24 | Olin Mathieson | Composite aluminum article |
US6602363B2 (en) * | 1999-12-23 | 2003-08-05 | Alcoa Inc. | Aluminum alloy with intergranular corrosion resistance and methods of making and use |
-
2006
- 2006-11-03 AU AU2006235903A patent/AU2006235903B2/en not_active Ceased
- 2006-11-10 CA CA002567681A patent/CA2567681A1/en not_active Abandoned
- 2006-11-10 NO NO20065162A patent/NO20065162L/en not_active Application Discontinuation
- 2006-11-13 NZ NZ551262A patent/NZ551262A/en not_active IP Right Cessation
- 2006-11-16 AT AT06124232T patent/ATE513933T1/en not_active IP Right Cessation
- 2006-11-16 EP EP06124232A patent/EP1918393B1/en not_active Not-in-force
- 2006-11-17 US US11/600,909 patent/US20080107560A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3368952A (en) * | 1964-05-18 | 1968-02-13 | Olin Mathieson | Alloy for cathodic protection galvanic anode |
JP2002097539A (en) * | 2000-09-25 | 2002-04-02 | Nakabohtec Corrosion Protecting Co Ltd | Aluminum alloy for galvanic anode in low-temperature seawater environment |
KR20050067605A (en) * | 2003-12-29 | 2005-07-05 | 주식회사 삼공사 | Aluminum alloy for galvanic anode |
Non-Patent Citations (2)
Title |
---|
1 January 1900 (1900-01-01), 19000101 , XP008099770 * abstract * & CHEMICAL ABSTRACTS, vol. 54, no. 2, 1996, Columbus, Ohio, US; abstract no.: 125:336054, OSAMI NAGATA, TAKEUCHI KATSUZI: "Corrosion after 3.5 years' service of an aluminum boat using 6951 alloy brazed honeycomb panels and 6N01-T5 alloy extrusions on her main hull structures" XP008099770 * abstract * * |
19000101, 1 January 1900 (1900-01-01), XP008099771 & CHEMICAL ABSTRACTS, vol. 54, no. 2, 1989, Columbus, Ohio, US; abstract no.: 112:61028, H. MEISSNER: "A review of long-term corrosion tests on aluminum alloys in Arabian Gulf water" page 299 XP008099771 * |
Also Published As
Publication number | Publication date |
---|---|
NO20065162L (en) | 2008-05-04 |
EP1918393A3 (en) | 2009-01-28 |
NZ551262A (en) | 2007-03-30 |
AU2006235903A1 (en) | 2008-05-22 |
EP1918393B1 (en) | 2011-06-22 |
AU2006235903B2 (en) | 2011-03-03 |
CA2567681A1 (en) | 2008-05-03 |
US20080107560A1 (en) | 2008-05-08 |
ATE513933T1 (en) | 2011-07-15 |
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