US3616419A - Arrangement for cathodic corrosion protection - Google Patents

Arrangement for cathodic corrosion protection Download PDF

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Publication number
US3616419A
US3616419A US713551A US3616419DA US3616419A US 3616419 A US3616419 A US 3616419A US 713551 A US713551 A US 713551A US 3616419D A US3616419D A US 3616419DA US 3616419 A US3616419 A US 3616419A
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US
United States
Prior art keywords
arrangement
strip
anode
strip element
pipe
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
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US713551A
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English (en)
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Luigi Bagnulo
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Individual
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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
    • C23F2213/32—Pipes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S138/00—Pipes and tubular conduits
    • Y10S138/06—Corrosion

Definitions

  • Cathodic protection can be achieved by two methods with the protective action obtained being the same in both cases.
  • a potential is generated by means of some metal or alloy having a greater solution pressure than the one which it is intended to protect. Two metals fonn a voltaic couple, the anode goes into solution and the cathode is protected against corrosion.
  • a voltage from an external source may be applied to an anode and the surface to be protected serves as the cathode. In this latter case means for supplying direct current must of course be available.
  • the second approach is particularly known for the protection of metallic pipe lines carrying wet gases, water, or other corrosion-producing liquids, and for cables, vessels and the like which are similarly exposed to the danger of corrosion.
  • I provide an elongated metallic element having a surface exposed to a corrosion-producing fluid, and a metallic strip element extending on the surface in direction of elongation of the elongated element in substantially continuous electrically conductive contact therewith, the elongated metallic element constituting a cathode and the strip element constituting an anode with a direct current flowing from the latter to the former at substantially identical density along the entire elongation of the elements.
  • FIG. I is a diagrammatic end view of an arrangement embodying my invention.
  • FIG. 2 is a view similar to FIG. 1, but illustrating a different embodiment
  • FIG. 3 is a fragmentary perspective view, illustrating one manner in which the anode may be secured to the cathode;
  • FIG. 4 is a view similar to FIG. 3, but illustrating a different manner of securing the anode to the cathode;
  • FIG. 5 is a fragmentary side elevation showing still a further manner of securing the anode to the cathode.
  • FIG. 1 of the drawing the member to be protected is illustrated as a metallic pipe P having an inner annular surface S to which there is secured, extending along at least one generatrix thereof, a strip-shaped metallic anode A.
  • the force lines are shown by the dashed arrows.
  • this anode A is intended to protect the pipe P against corrosion from corrosionproducing fluids flowing therethrough and acting as an electrolyte.
  • the anode A is secured, also in accordance with the invention, in electrically conductive relationship to the surface S substantially continuously over its entire length. Securing can be effected by welding the anode A directly to the surface S, or by connecting-via partial embedding or the likean electrically conductive element with the anode A and in turn welding this element to the surface S of the pipe P.
  • I may provide the surface S along the line over which the anode A is to be placed with a plurality of projections. This may be done by toughening the surface along this line, for instance by sandblasting or the like. Thereupon, a ribbon of adhesive material, such as resin material, mastic or the like, is placed along this line, care being taken that the free tips of whatever protrusions have been provided will penetrate the ribbon of adhesive material so that, when the anode A is placed onto the adhesive material to be held thereby on the surface S, these tips will be in electrically conductive engagement with the anode A. This latter construction avoids the formation of a film of fluid between the anode A and the surface S.
  • a ribbon of adhesive material such as resin material, mastic or the like
  • the anode may consist of aluminum, zinc, magnesium or another alloy having a greater solutions pressure than the material of the pipe P and capable of forming with the metal of the pipe a voltaic couple. Under these circumstances a galvanic current will flow from the anode A to the pipe P and protect the latter cathodically. These considerations apply also, of course, if the anode A is placed on the exterior of the pipe P, for instance if the pipe is to be buried in the ground and is to be protected against corrosion resulting from the ambient moisture in the ground.
  • a protective covering for example a coating of paint, bitumen or another suitable compound
  • a protective and easily removable material for instance an insulating adhesive tape which is removed subsequent to application of the coating, leaving the anode bare.
  • FIGS. 2-5 illustrate the different ways of positioning and securing the anode on the cathode which have been discussed above, and these FIGS. are therefore believed to be self-explanatory, it being clear that FIG. 2 illustrates the anode on the outer surface of the pipe, that FIG. 3 shows direct welding of the anode of the pipe while FIG. 4 shows securing of the anode by means of a partially embedded conductive strip which in turn is welded to the pipe, and that FIG. 5 shows adhesive securing of the anode to the pipe.
  • An arrangement for cathodic corrosion protection comprising, in combination, an elongated tubular metallic element of predetermined length and having a surface of a predetermined area exposed to a corrosion-producing fluid; and a metallic strip element having a surface area which is substantially smaller than said predetermined area and extending on said surface in direction of elongation of said elongated element over the entire length of the latter in substantially continuous electrically conductive contact therewith, said elongated metallic elements constituting a cathode and said strip element consisting of a metal higher in the electromotive series than said metallic element and constituting an anode with a direct current flowing from said strip element to said metallic element at substantially identical density along the entire elongation of said elements for substantially uniform protection of said metallic element over said predetermined area of said exposed surface thereof.
  • tubular element has inner and outer annular faces, and wherein said surface is constituted by one of said faces.
  • tubular element is a pipe adapted for passage therethrough of a corrosion-producing fluid, and wherein said surface is the inner annular face of said pipe.
  • said surface comprises a plurality of protrusions arrayed longitudinally of said elongated metallic element; and further comprising a longitudinally extending ribbon of adhesive material interposed between said surface and said strip element substantially embedding said protrusion and having a thickness such that the tips of said protrusions project through said ribbon into electrically conductive contact with said strip element.
  • An arrangement as defined in claim overlying a strip portion of said surface; and further comprising a protective coating provided on and covering the remaining portion of said surface not covered by said strip element.
  • tective coating is bitumen.

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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)
US713551A 1967-03-15 1968-03-15 Arrangement for cathodic corrosion protection Expired - Lifetime US3616419A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1378267 1967-03-15

Publications (1)

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US3616419A true US3616419A (en) 1971-10-26

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US713551A Expired - Lifetime US3616419A (en) 1967-03-15 1968-03-15 Arrangement for cathodic corrosion protection

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US (1) US3616419A (en)van)
BE (1) BE711874A (en)van)
DE (1) DE1696133A1 (en)van)
FR (1) FR1566510A (en)van)
GB (1) GB1159374A (en)van)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137229A (en) * 1983-02-23 1984-10-03 Jerry Donald Hughes Internal sacrificial anode for subsurface conduit
US4487672A (en) * 1982-11-01 1984-12-11 United States Steel Corporation Method for decreasing corrosion of internal surfaces of metallic conduit systems
US5169266A (en) * 1989-11-24 1992-12-08 Sandvik Italia Corrosion resistant structure for soil reinforcement
NL2016587A (en) * 2016-04-01 2017-10-04 Heerema Marine Contractors Nl Pipeline comprising anodes and method of laying said pipeline.
US20240117499A1 (en) * 2021-08-25 2024-04-11 The United States Of America As Represented By The Secretary Of The Navy Corrosion resistant bimetal
CN118792656A (zh) * 2024-06-27 2024-10-18 广东省水利水电第三工程局有限公司 一种管道跨接电缆微损焊接方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT993555B (it) * 1973-04-19 1975-09-30 Bagnulo L Anodi di sacrificio adesivi per evitare fenomeni di corro sione su strutture metalliche in genere
EP0170129A1 (en) * 1984-07-11 1986-02-05 Henri Stanislaus St. Onge Method and apparatus for cathodic protection of metal piping
NO914123L (no) * 1991-10-21 1993-04-22 Alcatel Stk As Fremgangsmaate for korrosjonsbeskyttelse av j-roer
DE29717624U1 (de) * 1997-10-02 1997-11-27 Krieg, Walter, 79098 Freiburg Dekorationsvorrichtung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4487672A (en) * 1982-11-01 1984-12-11 United States Steel Corporation Method for decreasing corrosion of internal surfaces of metallic conduit systems
GB2137229A (en) * 1983-02-23 1984-10-03 Jerry Donald Hughes Internal sacrificial anode for subsurface conduit
US5169266A (en) * 1989-11-24 1992-12-08 Sandvik Italia Corrosion resistant structure for soil reinforcement
NL2016587A (en) * 2016-04-01 2017-10-04 Heerema Marine Contractors Nl Pipeline comprising anodes and method of laying said pipeline.
US20240117499A1 (en) * 2021-08-25 2024-04-11 The United States Of America As Represented By The Secretary Of The Navy Corrosion resistant bimetal
CN118792656A (zh) * 2024-06-27 2024-10-18 广东省水利水电第三工程局有限公司 一种管道跨接电缆微损焊接方法

Also Published As

Publication number Publication date
DE1696133A1 (de) 1971-12-30
FR1566510A (en)van) 1969-05-09
BE711874A (en)van) 1968-07-15
GB1159374A (en) 1969-07-23

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