US3074876A - Anode for cathodic protection - Google Patents

Anode for cathodic protection Download PDF

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Publication number
US3074876A
US3074876A US735600A US73560058A US3074876A US 3074876 A US3074876 A US 3074876A US 735600 A US735600 A US 735600A US 73560058 A US73560058 A US 73560058A US 3074876 A US3074876 A US 3074876A
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US
United States
Prior art keywords
fins
anode
long
mass
short
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.)
Expired - Lifetime
Application number
US735600A
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English (en)
Inventor
Waite William Godfrey
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.)
FA Hughes and Co Ltd
Original Assignee
Hughes & Co
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 Hughes & Co filed Critical Hughes & Co
Application granted granted Critical
Publication of US3074876A publication Critical patent/US3074876A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • C23F13/10—Electrodes characterised by the structure
    • 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

  • This invention relates to the cathodic protection of ferrous metal structures against corrosion by the provision, in electrical connection therewith, of consumable or sacrificial anodes made of a metal or metal alloy anodic to the metal of the structure.
  • the anodes may desirably be made of magnesium base alloy.
  • anodes of relatively small volume but large surface area are likely to sustain damage in moving water.
  • subsidiary anodes are provided which radiate from the main anode they cannot as heretofore constructed be conveniently of large enough surface area to provide sufficiently high initial current owing to the difiiculty of handling and mounting without damage.
  • the object of the present invention is to provide a single anode which will give a high current for initial polarisation of the structure with automatic reduction in output over a period of time to the lower level required for maintenance.
  • an anode having a large central mass surrounding a central core by which it can be mounted, a pair of long tapering fins projecting from the mass radially in opposite directions and a pair of short fins projecting radially from the mass in opposite directions at about right angles to the long fins.
  • Each short fin in radial view is tapered and has two curved surfaces merged into the tapering sides of the long fins, each part of said curved surface being of less distance from the axis of the cen-- tral mass than the radial dimensions of the short fins.
  • the proximity or interference effects occasioned by the short fins reduce current output, and consequently consumption of the anode, about the point where the long tapering fins join the main body thus preventing the possibility of selective attack at these points which could otherwise result in the loss of the long fins before they were usefully consumed.
  • the radial length of the short fins may be between 40% and 60% of the radial length of the long fins and the axial length of the anode may be as required to produce the necessary current output.
  • the core may be constructed according to the invention described in the specification of United States patent application No. 713,727, now abandoned.
  • FIGURE 1 is a side elevational view of an anode made in accordance with the invention.
  • FIGURE 2 is a plan view of FIGURE 1;
  • FIGURE 3 is an end elevation looking in the direction of the arrow 3 on FIGURE 2.
  • the anode has a large central mass 10 surrounding a central core 11, e.g. an iron rod (or tube) by which it can be mounted.
  • the block it ⁇ has two pairs of fins 12, 13 and 14, 15 which are integral with the block.
  • the fins 12, 13 are in line and offset 180 from each other around the axis of the core.
  • the fins 14, 15 are in line and offset 180 to each other and offset to the fins 12, 13, so that the fins 12, 13 project radially in opposite directions as also do the fins 14, 15. All the fins are tapered and each tapering side of a short fin merges into the adjacent tapering side of a long fin by a curved surface as shown at 17.
  • the fins 14, 15 have a radial length 18 which is between 40% and 60% of the radial length 19 of the long fins.
  • the surface 17 approaches as at 20 at a distance nearer to the core than the radial distance 18 of the short fins.
  • the axial length 22 of the anode is from to 280 percent of the radius 18 of the short fins.
  • An anode for the cathodic protection of ferrous metal structures comprising a large central mass of the anodic metal surrounding a central core by which it can be mounted, a pair of long tapering fins projecting from the mass radially in opposite directions, and a pair of short fins projecting radially from the mass radially in opposite directions at about right angles to the long fins.
  • each short fin in axial view being tapered and having two curved surfaces which merge into the tapering sides of the long fins, each said curved surface having a part of less distance from the axis of the central mass than the radial dimension of the short fins.
  • An anode for the cathodic protection of ferrous metal structures comprising a large central mass of the anodic metal surrounding a central core by which it can be mounted, a pair of long tapering fins projecting from the mass radially in opposite directions, and a pair of short fins projecting radially from the mass radially in opposite directions at about right angles to the long fins, said short fins extending to a radial distance between 40% and 60% of the radial length of the long fins, each short fin in axial view being tapered and having two curved surfaces which merge into the tapering sides of the long fins, each said curved surface having a part of less distance from the axis of the central mass than the radial dimension of the short fins, the axial length of the anode being from 150% to 280% of the radius of the short fins.

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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)
US735600A 1957-05-20 1958-05-15 Anode for cathodic protection Expired - Lifetime US3074876A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15927/57A GB835795A (en) 1957-05-20 1957-05-20 Improvements in or relating to the protection of ferrous metal structures against corrosion

Publications (1)

Publication Number Publication Date
US3074876A true US3074876A (en) 1963-01-22

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ID=10068057

Family Applications (1)

Application Number Title Priority Date Filing Date
US735600A Expired - Lifetime US3074876A (en) 1957-05-20 1958-05-15 Anode for cathodic protection

Country Status (5)

Country Link
US (1) US3074876A (is")
BE (1) BE567861A (is")
DE (1) DE1129802B (is")
FR (1) FR1195176A (is")
GB (1) GB835795A (is")

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3321305A (en) * 1961-05-11 1967-05-23 Aluminium Lab Ltd Cathodic protection alloys

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR347333A (fr) * 1904-10-22 1905-03-04 Meunier Soc Système de désincrustation des chaudières à vapeur
US1435671A (en) * 1922-03-10 1922-11-14 Roessler & Hasslacher Chemical Anode
GB683629A (en) * 1950-01-13 1952-12-03 Hughes & Co Improvements in or relating to anodes for the protection of metal structures against corrosion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR347333A (fr) * 1904-10-22 1905-03-04 Meunier Soc Système de désincrustation des chaudières à vapeur
US1435671A (en) * 1922-03-10 1922-11-14 Roessler & Hasslacher Chemical Anode
GB683629A (en) * 1950-01-13 1952-12-03 Hughes & Co Improvements in or relating to anodes for the protection of metal structures against corrosion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3321305A (en) * 1961-05-11 1967-05-23 Aluminium Lab Ltd Cathodic protection alloys

Also Published As

Publication number Publication date
BE567861A (is") 1900-01-01
GB835795A (en) 1960-05-25
FR1195176A (fr) 1959-11-16
DE1129802B (de) 1962-05-17

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