AU2006235903B2 - Alloy for use in galvanic protection - Google Patents

Alloy for use in galvanic protection Download PDF

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Publication number
AU2006235903B2
AU2006235903B2 AU2006235903A AU2006235903A AU2006235903B2 AU 2006235903 B2 AU2006235903 B2 AU 2006235903B2 AU 2006235903 A AU2006235903 A AU 2006235903A AU 2006235903 A AU2006235903 A AU 2006235903A AU 2006235903 B2 AU2006235903 B2 AU 2006235903B2
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AU
Australia
Prior art keywords
anode
per cent
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.)
Ceased
Application number
AU2006235903A
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AU2006235903A1 (en
Inventor
Brett Alexander Maddern
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MARINE PROTECTION SYSTEMS Pty Ltd
Original Assignee
MARINE PROT SYSTEMS Pty Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MARINE PROT SYSTEMS Pty Ltd filed Critical MARINE PROT SYSTEMS Pty Ltd
Priority to AU2006235903A priority Critical patent/AU2006235903B2/en
Priority to CA002567681A priority patent/CA2567681A1/en
Priority to NO20065162A priority patent/NO20065162L/en
Priority to NZ551262A priority patent/NZ551262A/en
Priority to EP06124232A priority patent/EP1918393B1/en
Priority to AT06124232T priority patent/ATE513933T1/en
Priority to US11/600,909 priority patent/US20080107560A1/en
Assigned to MADDERN, BRETT ALEXANDER reassignment MADDERN, BRETT ALEXANDER Request for Assignment Assignors: MARINA PROTECTION SYSTEMS PTY LTD
Publication of AU2006235903A1 publication Critical patent/AU2006235903A1/en
Assigned to MARINE PROTECTION SYSTEMS PTY LTD reassignment MARINE PROTECTION SYSTEMS PTY LTD Request for Assignment Assignors: MADDERN, BRETT ALEXANDER
Application granted granted Critical
Publication of AU2006235903B2 publication Critical patent/AU2006235903B2/en
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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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

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  • 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

The invention relates to an aluminium alloy and anode made therefrom containing silicon, iron, copper, manganese, magnesium, chromium, zinc and titanium. The anode is used as a sacrificial anode in water vessels with non-metallic hulls.

Description

AUSTRALIA PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT (Original) APPLICATION NO: LODGED: COMPLETE SPECIFICATION LODGED: ACCEPTED: PUBLISHED: RELATED ART: NAME OF APPLICANT: Marina Protection Systems Pty Ltd ACTUAL INVENTOR(S): Brett Alexander Maddern ADDRESS FOR SERVICE: LORD AND COMPANY, Patent and Trade Mark Attorneys, of 4 Douro Place, West Perth, Western Australia, 6005, AUSTRALIA. INVENTION TITLE: "ALLOY FOR USE IN GALVANIC PROTECTION" DETAILS OF ASSOCIATED PROVISIONAL APPLICATION NO'S: The following Statement is a full description of this invention including the best method of performing it known to me/us: TITLE "ALLOY FOR USE IN GALVANIC PROTECTION" FIELD OF THE INVENTION The present invention relates to an alloy used in the galvanic protection of non metallic water vessels. BACKGROUND TO THE INVENTION 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. SUMMARY OF THE INVENTION 20 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 2 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. BRIEF DESCRIPTION OF THE DRAWING 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. DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 20 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. 3 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 Ahlkg. 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. 4 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. 20 Modifications or variations as would be apparent to a skilled addressee are deemed to be within the scope of the present invention. 5

Claims (13)

1. 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.
2. An anode formed of an alloy according to claim 1.
3. An anode as according to claim 2, wherein the electrochemical potential of the anode is more negative than that of the cathode.
4. An anode as according to claim 3, wherein the electrochemical potential of the anode is in the range of -500 to -1200 mV.
5. An anode as according to claim 4, wherein the electrochemical potential of the anode is in the range of -500 to -1100 mV.
6. An anode as according to any one of 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.
7. 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.
8. An anode as according to any one of claims 2 to 7, for use in the galvanic protection of water vessels with non-metallic hulls.
9. An anode as according to claim 8, wherein the vessel is designed for use in seawater.
10. An anode as according to any one of 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.
11. 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.
12. 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.
13. An anode substantially as hereinbefore described with reference to, and as shown in the accompanying drawing. 7
AU2006235903A 2006-11-03 2006-11-03 Alloy for use in galvanic protection Ceased AU2006235903B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AU2006235903A AU2006235903B2 (en) 2006-11-03 2006-11-03 Alloy for use in galvanic protection
CA002567681A CA2567681A1 (en) 2006-11-03 2006-11-10 Alloy for use in galvanic protection
NO20065162A NO20065162L (en) 2006-11-03 2006-11-10 Alloy for use in galvanic protection
NZ551262A NZ551262A (en) 2006-11-03 2006-11-13 Alloy for making sacrificial anodes for use in galvanic protection
EP06124232A EP1918393B1 (en) 2006-11-03 2006-11-16 Alloy for use in galvanic protection
AT06124232T ATE513933T1 (en) 2006-11-03 2006-11-16 ALLOY FOR USE IN GALVANIC PROTECTION
US11/600,909 US20080107560A1 (en) 2006-11-03 2006-11-17 Alloy for use in galvanic protection

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 (2)

Publication Number Publication Date
AU2006235903A1 AU2006235903A1 (en) 2008-05-22
AU2006235903B2 true AU2006235903B2 (en) 2011-03-03

Family

ID=37890999

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2006235903A Ceased AU2006235903B2 (en) 2006-11-03 2006-11-03 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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368952A (en) * 1964-05-18 1968-02-13 Olin Mathieson Alloy for cathodic protection galvanic anode
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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4436553B2 (en) * 2000-09-25 2010-03-24 株式会社ナカボーテック Aluminum alloy for low temperature seawater environmental current anode
KR20050067605A (en) * 2003-12-29 2005-07-05 주식회사 삼공사 Aluminum alloy for galvanic anode

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368952A (en) * 1964-05-18 1968-02-13 Olin Mathieson Alloy for cathodic protection galvanic anode
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

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
CA2567681A1 (en) 2008-05-03
US20080107560A1 (en) 2008-05-08
ATE513933T1 (en) 2011-07-15
EP1918393A2 (en) 2008-05-07

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Owner name: MADDERN, BRETT ALEXANDER

Free format text: FORMER APPLICANT(S): MARINA PROTECTION SYSTEMS PTY LTD

PC1 Assignment before grant (sect. 113)

Owner name: MARINE PROTECTION SYSTEMS PTY LTD

Free format text: FORMER APPLICANT(S): MADDERN, BRETT ALEXANDER

FGA Letters patent sealed or granted (standard patent)
MK14 Patent ceased section 143(a) (annual fees not paid) or expired
NA Applications received for extensions of time, section 223

Free format text: AN APPLICATION TO EXTEND THE TIME FROM 03 NOV 2012 TO 03 NOV 2016 IN WHICH TO PAY A RENEWAL FEE HAS BEEN FILED

NB Applications allowed - extensions of time section 223(2)

Free format text: THE TIME IN WHICH TO PAY A RENEWAL FEE HAS BEEN EXTENDED TO 03 NOV 2016

MK14 Patent ceased section 143(a) (annual fees not paid) or expired