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WO1993001331A2 - Anodes pour protection cathodique - Google Patents

Anodes pour protection cathodique Download PDF

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Publication number
WO1993001331A2
WO1993001331A2 PCT/GB1992/001274 GB9201274W WO9301331A2 WO 1993001331 A2 WO1993001331 A2 WO 1993001331A2 GB 9201274 W GB9201274 W GB 9201274W WO 9301331 A2 WO9301331 A2 WO 9301331A2
Authority
WO
WIPO (PCT)
Prior art keywords
anode
anode according
filler
cathodic protection
ferro
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
PCT/GB1992/001274
Other languages
English (en)
Other versions
WO1993001331A3 (fr
Inventor
Thomas Gallacher
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.)
Jennings Winch & Foundry Co Ltd
Original Assignee
Jennings Winch & Foundry 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 Jennings Winch & Foundry Co Ltd filed Critical Jennings Winch & Foundry Co Ltd
Publication of WO1993001331A2 publication Critical patent/WO1993001331A2/fr
Publication of WO1993001331A3 publication Critical patent/WO1993001331A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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

  • the present invention relates to anodes for use in
  • EP-A-0 085 582 discloses an anode for use in such a system consisting of a matrix of synthetic plastics material loaded with a particulate carbon material in the form of graphite or petroleum coke to provide the required electrical conductivity.
  • EP 0 186 334 discloses a porous anode formed of TiO x in bulk form where x is in the range 1.6 to 1.9, preferably 1.67 to 1.85.
  • An anode according to the present invention is characterised in that the particulate filler incorporated in a polymer matrix is Ferro Titanium, TiO x or a misture thereof.
  • the Titanium content of the Ferro Titanium will be in the range 50-80% by weight of the Ferro Titanium.
  • the Ferro Titanium particles are in the size range of 300-500 microns.
  • a suitable synthetic plastics resin matrix is an epoxy resin available from Ciba Geigy under the specification CY219 ARALDITE (Trade Mark) resin and HY219 hardener, together with an appropriate accelerator. When first mixed, this resin composition has a low viscosity enabling a relatively large proportion of Ferro Titanium particles to be incorporated into it.
  • CY219 ARALDITE Trade Mark
  • HY219 hardener a resin available from Ciba Geigy under the specification CY219 ARALDITE (Trade Mark) resin and HY219 hardener, together with an appropriate accelerator. When first mixed, this resin composition has a low viscosity enabling a relatively large proportion of Ferro Titanium particles to be incorporated into it.
  • many other polymers are suitable, such as polypropylene and synthetic and natural elastomers.
  • Ferro Silicon Very poor conduction. Not suitable. Ferro Chromium Very poor conduction. Not suitable. Ferro Titanium Moderate conduction, Good resistance to chemical resistance.
  • the anode may be formed by pouring the mixture of polymer and metal particles into a depression formed in a horizontal concrete surface and subsequently concreting over the anode thus formed, after providing a suitable electrical connection to the anode. A further electrical connection is made to the
  • anodes are to be applied to vertical or sloping surfaces, it is generally more convenient to preform the anodes as tiles, for example about 2 to 3mm thick. These can then be concreted into the structure to be protected.
  • Figures 1 to 3 are graphs showing variation of impressed current with time
  • Figure 4 is a plan view of an anode
  • Figure 5 is a longitudinal sectional view of part of a reinforced concrete structure incorporating the anode of figure 4, the anode being shown in section on the line V-V of figure 4.
  • Figure 1 shows the variation of impressed current with time for anodes containing different percentages by weight of Ferro Titanium particles (in all cases consisting of about 71% by weight of Titanium ) .
  • the specimen has conducted a current, without failure, for over fifty days under a high driving voltage, and corresponding current, to give
  • attack has occurred on the anode either by attack on the concrete/anode interface or through the protective resin covering placed over the anode.
  • the attack is observed as rust coloured growths on the surface of the protective covering. At the time of writing this attack has had no deleterious effects.
  • Resin/filler tiles have been manufactured and have a relatively low resistance (10-20 ohms) although none have so far been tested.
  • the resin tiles however do overcome the problems of the placement of the anode to other than horizontal surfaces and sinking of the conductive filler.
  • the tile consists of two sheets 21 and 22 of a polymer such as polypropylene containing 50 to 60% by volume of a filler consisting of
  • the polypropylene may for example be Neste VC35 12H (polypropylene homopolymer for injection moulding, MFI 35).
  • Each sheet may be formed by "picture frame” compression moulding or by extrusion or rolling and thereafter cutting into sheets of appropriate dimensions for easy handling and installation.
  • the surfaces of the sheets are abraded (with emery paper, grade 60 to 200, or by wire brushing) to remove any skin of polymer on the surfaces.
  • At least one electrical conductor 23 is placed on the top surface of- the lower sheet 22, the top sheet 21 is placed on top and suitably bonded to the lower sheet. For smaller tiles it may be sufficient to have one straight conductor 23 as shown in figure 4. If desired, however, a greater number of conductors may be provided or one (or more) conductor may be used which follows a sinuous path as indicated at 25 in broken lines in figure 4.
  • the resulting tile 20 is formed with a large number of apertures 26 extending through both sheets 21 and 22, the area of the apertures 26 being for example in the range of 40 to 60%, typically 50%, of the total surface area of the tile.
  • the surface 33 of the structure 31 is first cleaned (and repaired as necessary) and tiles 20 are fixed to the surface 33.
  • the tiles may be laid close to each other so is effectively to cover the whole of the surface 33 and their
  • conductors 23 are connected together.
  • a concrete layer 34 or grout is then applied over the tiles and fills the holes 26 to bond with the surface 33.
  • the tiles may be for example 2mm thick.
  • the amount of filler should be such that the electrical resistivity should be not greater than one ohm cm.
  • Typical impressed current density should be in the range 20 to 40 mA/m 2 , the maximum operating density being 100 mA/m 2 for periods up to three months.

Landscapes

  • 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

Une anode (20) utilisée pour la protection cathodique par application de courant d'une structure en béton armé est formée de deux feuilles (21, 22) de matrice polymère tel que du polypropylène ayant un métal d'apport de Fe-Ti, TiOx ou TiO2 ou des mélanges de ceux-ci pour rendre l'anode conductrice. L'anode peut avoir la forme d'une tuile formée de deux feuilles (21, 22) entre lesquelles passe un conducteur électrique (23). La tuile comporte des ouvertures (26) permettant de lier le béton ou le plâtre à une sous-couche de béton (33).
PCT/GB1992/001274 1991-07-12 1992-07-13 Anodes pour protection cathodique Ceased WO1993001331A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9115184.5 1991-07-12
GB919115184A GB9115184D0 (en) 1991-07-12 1991-07-12 Anodes for cathodic protection

Publications (2)

Publication Number Publication Date
WO1993001331A2 true WO1993001331A2 (fr) 1993-01-21
WO1993001331A3 WO1993001331A3 (fr) 1993-03-18

Family

ID=10698339

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/001274 Ceased WO1993001331A2 (fr) 1991-07-12 1992-07-13 Anodes pour protection cathodique

Country Status (2)

Country Link
GB (1) GB9115184D0 (fr)
WO (1) WO1993001331A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5650060A (en) * 1994-01-28 1997-07-22 Minnesota Mining And Manufacturing Company Ionically conductive agent, system for cathodic protection of galvanically active metals, and method and apparatus for using same
US6559373B2 (en) * 2000-10-13 2003-05-06 Envitech, Inc. Metal corrosion prevention system using a non-sacrificial photoanode under sunlight

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118294A (en) * 1977-09-19 1978-10-03 Diamond Shamrock Technologies S. A. Novel cathode and bipolar electrode incorporating the same
EP0197981B1 (fr) * 1984-10-01 1990-02-28 Eltech Systems Corporation Electrode polymere catalytique pour protection cathodique et systeme de protection cathodique la comprenant
DD275487A1 (de) * 1988-09-12 1990-01-24 Freiberg Brennstoffinst Anode fuer den katodischen korrosionsschutz von stahl- oder spannbeton
EP0443229A1 (fr) * 1990-02-20 1991-08-28 Ebonex Technologies, Inc. Composition électroconductrice et son application

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5650060A (en) * 1994-01-28 1997-07-22 Minnesota Mining And Manufacturing Company Ionically conductive agent, system for cathodic protection of galvanically active metals, and method and apparatus for using same
US6559373B2 (en) * 2000-10-13 2003-05-06 Envitech, Inc. Metal corrosion prevention system using a non-sacrificial photoanode under sunlight

Also Published As

Publication number Publication date
WO1993001331A3 (fr) 1993-03-18
GB9115184D0 (en) 1991-08-28

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