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EP0147977A2 - Anodes pour la protection cathodique - Google Patents

Anodes pour la protection cathodique Download PDF

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Publication number
EP0147977A2
EP0147977A2 EP84308641A EP84308641A EP0147977A2 EP 0147977 A2 EP0147977 A2 EP 0147977A2 EP 84308641 A EP84308641 A EP 84308641A EP 84308641 A EP84308641 A EP 84308641A EP 0147977 A2 EP0147977 A2 EP 0147977A2
Authority
EP
European Patent Office
Prior art keywords
anode
concrete
strands
conductive
inch
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.)
Withdrawn
Application number
EP84308641A
Other languages
German (de)
English (en)
Other versions
EP0147977A3 (fr
Inventor
Richard F. Stratfull
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.)
Raychem Corp
Original Assignee
Raychem Corp
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 Raychem Corp filed Critical Raychem Corp
Publication of EP0147977A2 publication Critical patent/EP0147977A2/fr
Publication of EP0147977A3 publication Critical patent/EP0147977A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • 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
    • 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
    • C23F2201/00—Type of materials to be protected by cathodic protection
    • C23F2201/02—Concrete, e.g. reinforced

Definitions

  • This invention relates to the cathodic protection of corrodible substrates, in particular reinforcing bars in concrete.
  • the substrate is made the cathode in a circuit which includes a DC current source, an anode, and an electrolyte between the anode and the cathode.
  • the exposed surface of the anode is made of a material which is resistant to corrosion, for example platinum or a dispersion in an organic polymer of carbon black or graphite.
  • the anode can be a discrete anode, or it can be a distributed anode in the form of an elongate strip or a conductive paint.
  • substrate which need protection from corrosion including reinforcing members in concrete, which are often referred to as "rebar".
  • a novel anode which comprises a plurality of elongate strands which are joined to each other to form a flexible open mesh, at least some of the strands being electrically conductive and comprising carbonaceous material which provides at least part of the electrochemically active surface of the anode.
  • the novel anode is particularly useful for the cathodic protection of reinforcing members in concrete.
  • the elongate strands are electrically conductive and comprise carbonaceous material which provides at least part of the electrochemically active surface of the mesh.
  • the carbonaceous material provides all the electrochemically active surface of the mesh.
  • the mesh can include other materials at its electrochemically active surface, or can be installed so that it is in physical and electrical contact with an electronically conductive material, eg coke breeze, which thus provides part of the electrochemically active surface of the anode.
  • Such other materials can be resistant to corrosion or can be electrochemically sacrificial, provided that the electrochemical reaction products of such sacrificial materials do not produce any unacceptable results.
  • the conductive strands comprise carbonaceous fibers, particularly carbon fiber yarns, this term being used to include graphite fiber yarns. Such yarns are commercially available, for example from Union Carbide, Hercules and Courtaulds.
  • the conductive strands comprise a continuous elongate metal core, and an elongate element which electrically surrounds the core and is in electrical contact therewith, and which is composed of an organic polymer and carbonaceous material (eg. carbon black or graphite) which is dispersed in the polymer.
  • Such a strand can also comprise carbonaceous fibers, eg carbon or graphite fibers, which are partially embedded in the polymer and extend from its surface.
  • Serial Nos. 403,203 and 485,572 incorporated herein by reference.
  • the physical and electrical characteristics of the elongate strands should be selected by reference to the intended use of the anode. If the strands do not have sufficient current- carrying ability to provide the desired current density at all points when connected to the power supply at a single point, then connection can be made at a plurlity of points, or a bus bar, eg. a platinum or platinum-coated wire, can be connected to the conductive strands along one or more lines, eg. edges, of the mesh.
  • a bus bar eg. a platinum or platinum-coated wire
  • the mesh can consist substantially of elongate electrically conductive strands (some, and preferably all, of such strands having carbonaceous material at their electrochemically active surface), or it can also contain non-conductive strands which help to provide the anode with its open mesh structure, for example glass fiber or organic polymer filament yarns.
  • non-conductive strands When non-conductive strands are present, they can all run in one direction, or some can run in one direction and others in a different direction; similarly the conductive strands can all run in one direction, or some can run in one direction and others in another direction.
  • the elongate strands can be joined together directly or indirectly in any convenient way, for example by knotting or melt-bonding, or with the aid of adhesive or clips. There can be electrical as well as physical connection at junctions between electrically conductive strands.
  • the preferred size of the mesh depends somewhat upon the installation, bearing in mind both the electrochemical and physical requirements, including in some cases the relative coefficients of thermal expansion of the strands and the materials contacting them.
  • the minimum dimension of the aperture i.e. the length of the shortest side of the aperture
  • the minimum dimension of the aperture will generally be at least 0.5 inch (1.3 cm), preferably at least 1 inch (2.5 cm), particularly at least 2 inch (5.0 cm).
  • the maximum dimension of the aperture i.e.
  • the length of the longest side of the aperture will generally be less than 24 inch (60 cm), preferably less than 8 inch (20 cm) and in some cases less than 4 inch (10 cm) or less than 3 inch (7.5 cm).
  • the apertures in the mesh can be of any shape, eg square or other rectangular shape, or diamond-shaped. The size and shape of the apertures are usually the same throughout a particular anode, but can be different.
  • the anodes of the invention are preferably flexible, this term being used herein to mean that the anode can be bent, along at least one axis, and preferably along two perpendicular axes, through an angle of 180° around a round mandrel of diameter 12 inch (30 cm), and preferably around a round mandrel of diameter 6 inch (15 cm), without suffering damage.
  • This property results in a very significant advantage, namely that the anode can easily be transported in rolls to an installation site, and can be installed in a wide variety of different situations with a minimum of difficulty.
  • at least the strands running in one direction should be flexible.
  • the strands are flexible; however, the strands running in one direction can be relatively rigid, and the structural stability of the anode in that direction can make the product easier to handle and install in some situations.
  • novel anodes are useful in any situation in which there is a requirement for corrosion protection over an area, especially in situations where low current densities are necessary or desirable.
  • the anode can be buried in the earth underneath a metal storage tank.
  • the invention is particularly useful for the cathodic protection of rebar in concrete, and will be described in detail below by reference to such use.
  • the anode is secured directly or indirectly to a surface of the concrete, preferably a surface which is parallel to the plane containing the rebar.
  • the surface can be flat or curved or otherwise shaped, and it can be substantially horizontal or inclined to the horizontal (including vertical).
  • the mesh anode and the concrete are preferably both contacted by a conductive material, especially one which is at least as conductive as the concrete.
  • This material preferably helps to secure the anode to the concrete, and can provide some other useful, e.g. structural, function. If the material is electronically conductive, its effect is to increase the surface area of the anode. If the material is ionically conductive, electrochemical reaction will take place at the interface between it and the mesh anode. In either case, there will be a reduction in the concentration of harmful reaction products to which the concrete is exposed.
  • the material is preferably one obtained by applying a shapeable (e.g.
  • a layer of such material is formed on the concrete before the anode is put in place, and the anode then secured to the layer in electrical contact therewith, preferably through the use of the same or a different conductive material.
  • the anode is put in place, and the material is then applied to the anode and the concrete; the anode can be in direct contact with the concrete, or separated from the concrete, e.g. with the aid of insulating spacers, prior to application of the material.
  • the material can be for example based on Portland Cement concrete, asphalt concrete, plaster or an organic polymer, with, if required, a sufficient amount of an additive to achieve the desired electronic or ionic conductivity.
  • the material should be selected having regard to the surface being treated; for example different compositions may be preferred for a horizontal surface and for a vertical column.
  • the material can be applied in any convenient way; for example a conductive cement or mortar can be sprayed onto the concrete surface to which the anode is attached.
  • the novel anodes can also be used to prepare pre-cast panels for incorporation into structures.
  • the anode can be incorporated in any relatively conductive material, eg. one of the materials used to secure an anode to a concrete surface as described above.
  • FIG. 1 to 4 show successive stages in rendering a reinforced concrete structure suitable for cathodic protection.
  • a mass of concrete 2 contains reinforcing bars 1.
  • a layer of a more conductive concrete 3 is laid on top of the concrete 1.
  • An anode comprising a mesh of carbon fiber yarns 4, tied together at the cross-over points, is placed on top of layer 3; a platinum-coated bus wire 5 makes contact with the yarns 4 running in one direction.
  • Figure 5 shows an anode which comprises a mesh of carbon fiber yarns 4 and which has been placed on the upper surface of a mass of concrete 2 containing reinforcing bars 1.
  • the anode has been secured to the concrete by means of conductive grout 6 along the lines of the mesh.
  • Figure 6 shows a conductive strand comprising a metal, eg. copper, core 41 surrounded by a conductive polymer layer 42.
  • Figure 7 is similar to figure 6, but also shows graphite fibers 43 partially embedded in the conductive polymer layer 42 and extending from the surface of the layer.
  • Figure 8 shows an anode in which the conductive strands 4 are joined together by insulating clips 44.
  • Figure 9 shows a concrete structure 2 which contains reinforcing rods 1 and around which is being wrapped a mesh anode 4.
  • Figure 10 shows a preformed panel in which an anode 4 and bus wire 5 are embedded within a layer 8 of conductive material.
  • the panel also includes an inner layer 9 of a conductive adhesive for securing the panel to a substrate, and a layer 7 which may be a structural element or simply a protective covering, and which may be electrically conductive or non-conductive.
  • the panel can also include a further layer (not illustrated) which is bonded to the layer 7 and is a traffic-wearing layer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Reinforced Plastic Materials (AREA)
EP84308641A 1983-12-13 1984-12-12 Anodes pour la protection cathodique Withdrawn EP0147977A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US56094483A 1983-12-13 1983-12-13
US560944 1983-12-13

Publications (2)

Publication Number Publication Date
EP0147977A2 true EP0147977A2 (fr) 1985-07-10
EP0147977A3 EP0147977A3 (fr) 1986-03-26

Family

ID=24240024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84308641A Withdrawn EP0147977A3 (fr) 1983-12-13 1984-12-12 Anodes pour la protection cathodique

Country Status (6)

Country Link
EP (1) EP0147977A3 (fr)
JP (1) JPS60149791A (fr)
AU (1) AU582559B2 (fr)
CA (1) CA1235088A (fr)
DK (1) DK594784A (fr)
NO (1) NO162427C (fr)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986004099A1 (fr) * 1985-01-14 1986-07-17 Eltac Nogler & Daum Kg Procede de protection contre la corrosion d'elements metalliques enrobes d'un manteau de protection
WO1986006759A1 (fr) * 1985-05-07 1986-11-20 Eltech Systems Corporation Systeme de protection cathodique pour une structure en beton arme et procede d'installation
EP0239530A1 (fr) * 1986-03-18 1987-09-30 Eltech Systems Corporation Protection cathodique de béton renforcé en contact avec un liquide conducteur
US4708888A (en) * 1985-05-07 1987-11-24 Eltech Systems Corporation Coating metal mesh
EP0262835A1 (fr) * 1986-09-16 1988-04-06 RAYCHEM CORPORATION (a California corporation) Electrodes en forme de treillis et chips utilisés pour le préparer
EP0280427A1 (fr) * 1987-02-09 1988-08-31 RAYCHEM CORPORATION (a California corporation) Electrodes pour utilisation dans des procédés électrochimiques
US4855024A (en) * 1986-09-16 1989-08-08 Raychem Corporation Mesh electrodes and clips for use in preparing them
GB2216140A (en) * 1988-01-13 1989-10-04 John Avery Edwards A method and design for corrosion protection coating system for application to ferrous and non-ferrous metals and concrete/cementitious surfaces
EP0499438A1 (fr) * 1991-02-12 1992-08-19 Ici Americas Inc. Système de béton armé
EP0503678A1 (fr) * 1991-03-15 1992-09-16 Materials Protection Company Procédé et dispositif de protection cathodique des fonds de réservoirs reposant sur terre
US5183694A (en) * 1988-04-19 1993-02-02 Webb Michael G Inhibiting corrosion in reinforced concrete
US5421968A (en) * 1985-05-07 1995-06-06 Eltech Systems Corporation Cathodic protection system for a steel-reinforced concrete structure
US5451307A (en) * 1985-05-07 1995-09-19 Eltech Systems Corporation Expanded metal mesh and anode structure
EP0730046A1 (fr) * 1995-03-01 1996-09-04 EKO d.o.o. Système électroconducteur anticorrosif
US5569526A (en) * 1991-09-23 1996-10-29 Oronzio De Nora S.A. Anode structure for cathodic protection of steel-reinforced concrete and relevant method of use
US5609748A (en) * 1988-08-09 1997-03-11 Heraeus Elektroden Gmbh Anode for cathodic protection against corrosion
US8083923B2 (en) * 2001-12-08 2011-12-27 Sika Technology Ag Electrode structure for protection of structural bodies
CN103205759A (zh) * 2013-04-16 2013-07-17 深圳大学 一种无需控制的钢筋混凝土结构阴极保护方法及装置
US9074288B2 (en) 2011-07-12 2015-07-07 Jarden Zinc Products, LLC Galvanic panel with compliant construction
US10378114B2 (en) * 2013-04-16 2019-08-13 Shenzhen University Cathode protection method and apparatus for reinforced concrete structure and composite structure and processing method for reinforced concrete structure
EP3640370A1 (fr) * 2018-10-17 2020-04-22 Koch GmbH Non-tissé à anode primaire
GB2590149A (en) * 2019-09-27 2021-06-23 E Chem Tech Ltd Protected reinforced concrete structure

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5423961A (en) * 1985-05-07 1995-06-13 Eltech Systems Corporation Cathodic protection system for a steel-reinforced concrete structure
JPH0762264B2 (ja) * 1986-02-25 1995-07-05 日本防蝕工業株式会社 外部電源方式による電気防食用陽極装置
JPH0730472B2 (ja) * 1986-02-25 1995-04-05 日本防蝕工業株式会社 電気防食用不溶性電極の取り付け構造
JPH0615792B2 (ja) * 1992-01-31 1994-03-02 欣一 内田 鉄筋コンクリート建造物における鉄筋防蝕方法及び鉄筋の腐蝕状態検出方法
JP5424127B2 (ja) * 2010-09-24 2014-02-26 住友大阪セメント株式会社 コンクリート構造物への電気防食電極の取り付け方法、およびコンクリート構造物
JP7270918B2 (ja) * 2018-03-26 2023-05-11 株式会社ケミカル工事 コンクリート構造物の電気防食構造及び電気防食工法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1971867A (en) * 1967-03-31 1968-10-03 Hooker Chemical Corporation Cathodic protection of reinforcing metals in electrolytic cells
AU558619B2 (en) * 1981-06-12 1987-02-05 Raychem Corporation Corrosion protection system
EP0085582A1 (fr) * 1982-02-05 1983-08-10 Harco Corporation Protection cathodique utilisant un béton polymère conducteur
US4473450A (en) * 1983-04-15 1984-09-25 Raychem Corporation Electrochemical method and apparatus

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3690002C1 (de) * 1985-01-14 1997-01-09 Nogler & Daum Eltac Korrosionsschutzverfahren für in einem Schutzmantel eingebettete Metallteile sowie Vorrichtung dazu
WO1986004099A1 (fr) * 1985-01-14 1986-07-17 Eltac Nogler & Daum Kg Procede de protection contre la corrosion d'elements metalliques enrobes d'un manteau de protection
US5421968A (en) * 1985-05-07 1995-06-06 Eltech Systems Corporation Cathodic protection system for a steel-reinforced concrete structure
WO1986006759A1 (fr) * 1985-05-07 1986-11-20 Eltech Systems Corporation Systeme de protection cathodique pour une structure en beton arme et procede d'installation
WO1986006758A1 (fr) * 1985-05-07 1986-11-20 Eltech Systems Corporation Maille en metal deploye et structure d'anode revetue
US4708888A (en) * 1985-05-07 1987-11-24 Eltech Systems Corporation Coating metal mesh
US6254743B1 (en) 1985-05-07 2001-07-03 Eltech Systems Corporation Expanded titanium metal mesh
US5759361A (en) * 1985-05-07 1998-06-02 Eltech Systems Corporation Cathodic protection system for a steel-reinforced concrete structure
US5639358A (en) * 1985-05-07 1997-06-17 Eltech Systems Corporation Cathodic protection system for a steel-reinforced concrete structure
US5451307A (en) * 1985-05-07 1995-09-19 Eltech Systems Corporation Expanded metal mesh and anode structure
EP0239530A1 (fr) * 1986-03-18 1987-09-30 Eltech Systems Corporation Protection cathodique de béton renforcé en contact avec un liquide conducteur
EP0262835A1 (fr) * 1986-09-16 1988-04-06 RAYCHEM CORPORATION (a California corporation) Electrodes en forme de treillis et chips utilisés pour le préparer
US4855024A (en) * 1986-09-16 1989-08-08 Raychem Corporation Mesh electrodes and clips for use in preparing them
EP0479337A3 (en) * 1987-02-09 1992-09-30 Raychem Corporation Electrodes for use in electrochemical processes
US4957612A (en) * 1987-02-09 1990-09-18 Raychem Corporation Electrodes for use in electrochemical processes
EP0280427A1 (fr) * 1987-02-09 1988-08-31 RAYCHEM CORPORATION (a California corporation) Electrodes pour utilisation dans des procédés électrochimiques
GB2216140A (en) * 1988-01-13 1989-10-04 John Avery Edwards A method and design for corrosion protection coating system for application to ferrous and non-ferrous metals and concrete/cementitious surfaces
US5183694A (en) * 1988-04-19 1993-02-02 Webb Michael G Inhibiting corrosion in reinforced concrete
US5609748A (en) * 1988-08-09 1997-03-11 Heraeus Elektroden Gmbh Anode for cathodic protection against corrosion
EP0499438A1 (fr) * 1991-02-12 1992-08-19 Ici Americas Inc. Système de béton armé
EP0503678A1 (fr) * 1991-03-15 1992-09-16 Materials Protection Company Procédé et dispositif de protection cathodique des fonds de réservoirs reposant sur terre
US5569526A (en) * 1991-09-23 1996-10-29 Oronzio De Nora S.A. Anode structure for cathodic protection of steel-reinforced concrete and relevant method of use
EP0730046A1 (fr) * 1995-03-01 1996-09-04 EKO d.o.o. Système électroconducteur anticorrosif
US8083923B2 (en) * 2001-12-08 2011-12-27 Sika Technology Ag Electrode structure for protection of structural bodies
US20120000769A1 (en) * 2001-12-08 2012-01-05 Sika Technology Ag Electrode structure for protection of structural bodies
US8557102B2 (en) * 2001-12-08 2013-10-15 Sika Technology Ag Electrode structure for protection of structural bodies
US9074288B2 (en) 2011-07-12 2015-07-07 Jarden Zinc Products, LLC Galvanic panel with compliant construction
CN103205759A (zh) * 2013-04-16 2013-07-17 深圳大学 一种无需控制的钢筋混凝土结构阴极保护方法及装置
CN103205759B (zh) * 2013-04-16 2016-01-27 深圳大学 一种无需控制的钢筋混凝土结构阴极保护方法及装置
US10378114B2 (en) * 2013-04-16 2019-08-13 Shenzhen University Cathode protection method and apparatus for reinforced concrete structure and composite structure and processing method for reinforced concrete structure
EP3640370A1 (fr) * 2018-10-17 2020-04-22 Koch GmbH Non-tissé à anode primaire
GB2590149A (en) * 2019-09-27 2021-06-23 E Chem Tech Ltd Protected reinforced concrete structure
GB2590149B (en) * 2019-09-27 2022-02-09 E Chem Tech Ltd Protected reinforced concrete structure

Also Published As

Publication number Publication date
NO844979L (no) 1985-06-14
DK594784A (da) 1985-06-14
NO162427C (no) 1990-01-03
AU3653284A (en) 1985-06-20
AU582559B2 (en) 1989-04-06
EP0147977A3 (fr) 1986-03-26
DK594784D0 (da) 1984-12-12
NO162427B (no) 1989-09-18
JPS60149791A (ja) 1985-08-07
CA1235088A (fr) 1988-04-12

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