US2639265A - Anodes for cathodic protection of metal structures - Google Patents

Anodes for cathodic protection of metal structures Download PDF

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Publication number
US2639265A
US2639265A US207618A US20761851A US2639265A US 2639265 A US2639265 A US 2639265A US 207618 A US207618 A US 207618A US 20761851 A US20761851 A US 20761851A US 2639265 A US2639265 A US 2639265A
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US
United States
Prior art keywords
anode
bag
backfill
anodes
metal structures
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
US207618A
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English (en)
Inventor
Horace J Simcox
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
FA Hughes and Co 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 FA Hughes and Co Ltd filed Critical FA Hughes and Co Ltd
Application granted granted Critical
Publication of US2639265A publication Critical patent/US2639265A/en
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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
    • C23F13/18—Means for supporting electrodes
    • 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
    • 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
    • C23F2213/32—Pipes

Definitions

  • This invention relates to anodes for cathodic protection of metal structures, the anodes being made of metal less noble than the structures to be protected.
  • anodes consisting of blocks of magnesium or a magnesium base alloy may be buried in the earth at intervals alongside an iron pipe line and connected thereto by lengths of insulated wire.
  • the anode To enable the anode to have satisfactory contact with the earth, it has been proposed to surround the anode With a backfill" of, for example, a mixture of gypsum and bentonite which may be contained in a fabric bag into which both the anode and the backfill are placed.
  • a backfill of, for example, a mixture of gypsum and bentonite which may be contained in a fabric bag into which both the anode and the backfill are placed.
  • the powdered backfill may pack and sink and cease to be effective over part at least of the anode.
  • the object of the present invention is to obviate this defect in a simple but effective and cheap manner.
  • a disc of cardboard or like fibrous material which seats on the top of the anode and is held down on the anode to prevent the latter from rising up above the level of the backfill, and a ring or two or more spaced rings of cardboard or other fibrous material is or are provided within the bag intermediate the ends thereof, the said ring or each of said rings having its inner periphery shaped to engage around the anode and its outer periphery making a fairly tight fit with the bag.
  • the disc may engage at its periphery with the bag and tapes may be attached to the bag and tied together over the disc to hold the latter down on to the anode.
  • the anode comprises a cylindrical element IU of magnesium, magnesium base alloy or other suitable metal within which there is secured a rod ll of, for example, iron.
  • the upper end of the rod projects from the element H], which for this purpose is formed with a depression or recess l2, and has an insulated cable I3 attached thereto at M, the other end [5 of the cable being tagged for attachment to the structure to be protected.
  • the recess is thereafter filled with an insulating substance, for example, bitumen, as shown at l2a.
  • Surrounding the anode is a strong cotton bag iii of rather larger dimensions than the element It. The space between the bag and the element In is filled with the backfill material I! so that the latter completely surrounds said element.
  • a cardboard or other fibrous disc l8 Surrounding the anode is a strong cotton bag iii of rather larger dimensions than the element It. The space between the bag and the element In is filled with the backfill material I! so that the latter completely surrounds said
  • the disc I8 will prevent this by its engagement with the element ill, or with the bitumen filling In if, as illustrated, this should project above the element H. The anode is thus held against riding up above the level of the backfill.
  • the tendency of the backfill to pack may be further prevented or reduced by the insertion within the bag of one or more rings 2
  • the or each ring 21 has its inner periphery shaped to fit the element l0 and is externally dimensioned to make a fairly tight fit within the bag.
  • These rings are of particular advantage where the anode is of considerable length in relation to its transverse dimension. In the embodiment illustrated, which shows an anode about two feet in length, two rings H are provided, the lower ring being about nine inches from the bottom of the bag and the other about midway between the lower ring and the disc [8.
  • the anode may be of any desired cross-sectional shape, for example, circular.
  • a cathodic protection device for metal structures comprising a fabric bag, an anode, a loose granular backfill, and at least one ring, said anode being positioned centrally of said bag and being surrounding by said backfill, said ring being composed of fibrous material and surrounding said anode intermediate the ends thereof, and having itsinner periphery engaging said anode and its outer periphery in fairly tight engagement with said bag.
  • a device as set forth in claim 1 wherein a disc is mounted on top of said anode and wherein means are present to hold said disc in place whereby the anode is prevented from riding up above the level of the backfill.
  • a device as set forth in claim 2 wherein said means comprises tapes secured to the inner wall of said bag, said tapes having their ends tied together above said last-named disc.
  • a device as set forth in claim 2 wherein said backfill, a disc mounted on top of said anode, said tapes being secured to the wall of said bag. and having their ends tied together above'said disc to prevent the anode from riding up above the level of said backfill, and said plurality of rings surrounding said anodeintermediate the h ends thereof, all of said rings having their outer peripheries in fairly tight engagement with said bag.

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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)
US207618A 1950-01-27 1951-01-24 Anodes for cathodic protection of metal structures Expired - Lifetime US2639265A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2195/50A GB672042A (en) 1950-01-27 1950-01-27 Improvements in or relating to anodes for cathodic protection of metal structures

Publications (1)

Publication Number Publication Date
US2639265A true US2639265A (en) 1953-05-19

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US207618A Expired - Lifetime US2639265A (en) 1950-01-27 1951-01-24 Anodes for cathodic protection of metal structures

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US (1) US2639265A (en))
BE (1) BE500877A (en))
GB (1) GB672042A (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972602C (de) * 1953-12-02 1959-08-20 Heinrich Dr-Ing Stein Bettungsmassen fuer galvanische Anoden, die dem kathodischen Korrosionsschutz dienen
US6187161B1 (en) * 1992-04-27 2001-02-13 Corrpro Companies, Inc. Reference cell

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427517A (en) * 1982-03-01 1984-01-24 The Dow Chemical Company Underground backfill for magnesium anodes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435973A (en) * 1941-08-19 1948-02-17 Rusta Restor Corp Method of and means for providing cathodic protection of metallic structures
US2525665A (en) * 1948-01-07 1950-10-10 Dow Chemical Co Packaged galvanic anodes for cathodic protection
US2567855A (en) * 1947-07-09 1951-09-11 Dow Chemical Co Rapid-wetting bentonite-calcium sulfate backfill for cathodic protection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435973A (en) * 1941-08-19 1948-02-17 Rusta Restor Corp Method of and means for providing cathodic protection of metallic structures
US2567855A (en) * 1947-07-09 1951-09-11 Dow Chemical Co Rapid-wetting bentonite-calcium sulfate backfill for cathodic protection
US2525665A (en) * 1948-01-07 1950-10-10 Dow Chemical Co Packaged galvanic anodes for cathodic protection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972602C (de) * 1953-12-02 1959-08-20 Heinrich Dr-Ing Stein Bettungsmassen fuer galvanische Anoden, die dem kathodischen Korrosionsschutz dienen
US6187161B1 (en) * 1992-04-27 2001-02-13 Corrpro Companies, Inc. Reference cell

Also Published As

Publication number Publication date
BE500877A (en))
GB672042A (en) 1952-05-14

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