EP1042535B1 - Connector for use in cathodic protection and method of use - Google Patents

Connector for use in cathodic protection and method of use Download PDF

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Publication number
EP1042535B1
EP1042535B1 EP99971473A EP99971473A EP1042535B1 EP 1042535 B1 EP1042535 B1 EP 1042535B1 EP 99971473 A EP99971473 A EP 99971473A EP 99971473 A EP99971473 A EP 99971473A EP 1042535 B1 EP1042535 B1 EP 1042535B1
Authority
EP
European Patent Office
Prior art keywords
anode
around
wires
elongate connector
connector
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
EP99971473A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1042535A1 (en
Inventor
Nigel Davison
Christopher Gorrill
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.)
Fosroc International Ltd
Original Assignee
Fosroc International 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
Priority claimed from GBGB9823654.0A external-priority patent/GB9823654D0/en
Application filed by Fosroc International Ltd filed Critical Fosroc International Ltd
Priority to EP05018590A priority Critical patent/EP1626107A1/en
Publication of EP1042535A1 publication Critical patent/EP1042535A1/en
Application granted granted Critical
Publication of EP1042535B1 publication Critical patent/EP1042535B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23F13/20—Conducting electric current to 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
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/16—Electrodes characterised by the combination of the structure and 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

  • This invention relates to the cathodic protection of steel in reinforced concrete employing a sacrificial anode, more particularly to the electrical connection of the sacrificial anode to the reinforcing steel it is intended to protect.
  • Sacrificial anodes are well known. To be effective the sacrificial anode is made of a metal which has a more negative electrode potential than the steel to be protected so that it will corrode in preference to the steel. Sacrificial anodes are described in European Patent No 0707667 and United States Patent No 5292411.
  • metal conductors have been previously used for this purpose.
  • these metal conductors such as wires, have been attached to the steel reinforcement by drilling a hole into which a self tapping screw is inserted.
  • Alternative methods have involved the use of clips or clamps to secure the wire to the metal to be protected.
  • the present invention provides a solution to these problems by the use of a sacrificial anode according to claim 1, a combination of an anode assembly as defined on claim 9, a method of installing a sacrificial anode as defined in claim 17 and an anode assembly in accordance with claim 25.
  • Specific embodiments are claimed in the claims depending thereon.
  • the connector can be installed in less time than the previously used methods involving the use of self tapping screws and is more secure than the clips or clamps.
  • the anode is preferably zinc but aluminium, cadmium or magnesium may be used. References to these metals include alloys containing them.
  • the electrical contact between the connector and the anode is preferably provided by having the anode in the form of a block which has been cast (by cast we mean allowing the liquid metal to solidify to form the block) around a portion of the length of the elongate connector.
  • the electrical contact may provided by the elongate connector being wound around the anode or by the connector being soldered or similarly attached to the anode.
  • the elongate connector is conveniently in the form of a wire, although other elongate forms may be used.
  • the wire may conveniently be of steel, preferably a mild steel.
  • the wire is as noble or more noble than the steel of the reinforcement.
  • the connector may comprise a plurality of wires twisted together over a portion of their length and the anode may be cast around the twisted portion.
  • twisted we mean to include folded or bent or crimped.
  • the purpose of the twisted portion is to increase the surface area of the wire forming the interface with the cast anode and thereby improve the electrical contact.
  • the wires may be twisted together at a position which is intermediate their ends (for example near the middle of their lengths) so that lengths of wire extend on both sides of the cast anode.
  • Patent Application No WO 94/29496 (European Patent Application No 0707667) describes a method of cathodic protection in which to maintain the cathodic protection over a sustained period of time the anode is surrounded by a material containing an electrolyte of high pH. To avoid passivation of the anode it recommends that in the case of a zinc anode the pH is at least about 14.
  • Suitable materials described in this patent are cementitious mortars which may be cast around the anode to form a unit. It is not essential that the mortar is cementitious although such mortars are more readily available.
  • the mortar may be prepared from a cement that has an intrinsically high alkali content or additional alkali may be added to the mortar eg sodium hydroxide or lithium hydroxide, the latter being preferred.
  • the assembly of anode and connector of the present invention may have a porous material eg a cementitious mortar cast around the anode.
  • a porous material eg a cementitious mortar cast around the anode.
  • cast we mean forming a solid block from the liquid or semiliquid mortar.
  • the casting is preferably carried out in a mold.
  • the porous material is one that preferably contains a high pH electrolyte as described in European Patent Application No 0707667 ie one containing an electrolyte solution whose pH is sufficiently high to maintain corrosion of the anode and passive film formation on the anode to be avoided when the anode is galvanically connected to the steel reinforcement.
  • the electrolyte solution is the pore solution.
  • the mortar will preferably have a content of alkali equivalent to at least 1% lithium hydroxide based on the dry weight of the ingredients used to make the mortar.
  • An equivalent amount of sodium hydroxide is 2% by weight.
  • the amount of lithium hydroxide is greater than 2% or an equivalent amount of sodium hydroxide of 4%.
  • Lithium hydroxide is the preferred alkali because lithium ions provide protection against alkali silica (or alkali aggregate) reactions in concrete.
  • mixtures of alkalis may be used for example mixtures of lithium hydroxide and sodium hydroxide.
  • the anode, the porous material eg mortar and the casting may also be as described in European Patent Application No 0707667.
  • the step (a) may comprise casting the anode around a portion of the length of the elongate connector.
  • step (c) may be carried out before or after step (b) which step (c) comprises casting around the anode a porous material containing an electrolyte solution having a pH sufficiently high for corrosion of the anode to occur and passive film formation to be avoided.
  • the anode is zinc in which case the pH of the electrolyte solution is desirably at least about 14.
  • the pH may be lower, for example at least 13.3 or 13.5
  • the invention is applicable to the construction of new reinforced concrete structures in which the anode assembly is connected to the reinforcement by means of the connector and a high pH porous material such as a mortar cast around the anode.
  • the invention is also applicable to the protection of existing concrete structures in which method a hole may be made in the concrete and (i) the anode inserted into the hole and (ii) the connector connected to the reinforcement and (iii) the high pH material cast around the anode. Steps (i), (ii) and (iii) may be carried out in any order
  • two wires each being a 16 SWG (standard wire guage) mild steel wire are twisted together over part of their length at 6.
  • the length of the twisted portion 6 is typically from about 38 to 42 mm.
  • Four lengths of wire in the form of arms 2, 4, 8 and 10 extend from the twisted portion 6.
  • the length of the arms 2, 4, 8 and 10 is typically from about 148 to 152mm and at the end of each arm are loops 12, 13 14 and 15.
  • the arms are each wound around the reinforcement. Usually one or two complete winds around the reinforcement is sufficient to make a satisfactory electrical contact.
  • the diameter of the loops is typically from about 9 to 11 mm.
  • the purpose of the loops is to facilitate the use of a tool of the type used to close paper sacks for potatoes and the like.
  • a suitable tool is a spring loaded ratchet twisting tool known as the Stanley tying tool and is available from Direct Wire Ties Limited. By means of the tool the arms which have been wound around the steel reinforcement (not shown) in reinforced concrete may then be twisted together. This has the effect of tightening the wire around the reinforcement.
  • a cylindrical zinc block 20 of about 40 mm diameter and about 7mm thickness has been cast around the twisted wires.
  • the centre of the cylindrical block 20 has been omitted to show the wires.
  • the top and bottom edges of the block 20 have been rounded to prevent crack inducement.
  • the assembly shown in Fig 2 was made by first twisting the wires together near the middle of their length and placing the twisted portion in a ceramic casting mould. Molten zinc was then poured into the mould. After solidifying the product which was removed from the mould.
  • the wire arms 2, 4 8, and 10 extend on both sides of the anode and enable the anode to be connected to more than one reinforcing element if desired.
  • a block of mortar 24 has been cast around the zinc shown in Fig 2 to give a thickness of 10 mm all round the zinc.
  • the assembly shown in Fig 3 was made by positioning the assembly shown in Fig 2 in a previously vacuum formed plastic mould so as to locate the zinc centrally in the mould.
  • a high pH cementitious mortar containing a pore solution of pH greater than 14 was prepared by mixing a Portland cement powder (containing 2% by weight of added lithium hydroxide based on the weight of the cement powder) with water and poured into the mould. This was allowed to harden for four hours and then removed from the mould to yield the product shown in Fig 3.

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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)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Processing Of Terminals (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Electrotherapy Devices (AREA)
  • Cable Accessories (AREA)
EP99971473A 1998-10-29 1999-10-28 Connector for use in cathodic protection and method of use Expired - Lifetime EP1042535B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05018590A EP1626107A1 (en) 1998-10-29 1999-10-28 Connector for use in cathodic protection and method of use

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB9823654.0A GB9823654D0 (en) 1998-10-29 1998-10-29 Connector for use in cathodic protection and method of use
GB9823654 1998-10-29
US09/306,419 US6193857B1 (en) 1998-10-29 1999-05-06 Connector for use in cathodic protection and method of use
US306419 1999-05-06
PCT/GB1999/003517 WO2000026439A2 (en) 1998-10-29 1999-10-28 Connector for use in cathodic protection and method of use

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP05018590A Division EP1626107A1 (en) 1998-10-29 1999-10-28 Connector for use in cathodic protection and method of use
EP04028225 Division 2004-11-29

Publications (2)

Publication Number Publication Date
EP1042535A1 EP1042535A1 (en) 2000-10-11
EP1042535B1 true EP1042535B1 (en) 2005-11-16

Family

ID=26314583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99971473A Expired - Lifetime EP1042535B1 (en) 1998-10-29 1999-10-28 Connector for use in cathodic protection and method of use

Country Status (18)

Country Link
EP (1) EP1042535B1 (tr)
JP (1) JP4491139B2 (tr)
CN (1) CN1195897C (tr)
AT (1) ATE310110T1 (tr)
AU (1) AU752647B2 (tr)
BR (1) BR9907086B1 (tr)
CA (1) CA2316983C (tr)
CZ (1) CZ295912B6 (tr)
DE (1) DE69928373T2 (tr)
ES (1) ES2253931T3 (tr)
HK (1) HK1049503B (tr)
ID (1) ID26715A (tr)
NO (1) NO323184B1 (tr)
NZ (1) NZ505421A (tr)
PL (1) PL195262B1 (tr)
TR (1) TR200002510T1 (tr)
TW (1) TW581826B (tr)
WO (1) WO2000026439A2 (tr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2425778B8 (en) * 2004-07-06 2019-05-01 E Chem Tech Ltd Protection of reinforcing steel
WO2006097770A2 (en) * 2005-03-16 2006-09-21 Gareth Glass Treatment process for concrete
JP2006336072A (ja) * 2005-06-02 2006-12-14 Tokyo Electric Power Co Inc:The 簡易防食装置
CN101517405B (zh) * 2006-09-11 2013-02-27 Vsl国际股份公司 用于确定含有至少水泥和水两种成分的混合物的钝化特性的方法和传感器
JP4772642B2 (ja) * 2006-10-20 2011-09-14 電気化学工業株式会社 アスファルト舗装道路のコンクリート床版の電気化学的処理方法
MX2015001298A (es) 2012-07-30 2015-06-05 Constr Res & Tech Gmbh Anodo galvanico y metodo para proteccion contra la corrosion.
CN104532259B (zh) * 2014-12-26 2017-10-20 青岛双瑞海洋环境工程股份有限公司 用于冷凝管系阴极保护的复合电化学装置
CN110467378B (zh) * 2019-08-05 2021-11-09 西安建筑科技大学 一种结构与腐蚀控制功能于一体的混凝土

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3434222A1 (de) * 1984-09-18 1986-03-20 Roth, Manfred, Dipl.-Volksw., 3563 Dautphetal Korrosionsschutzeinrichtung fuer heizoelbehaelter aus stahlblech
DE3826926A1 (de) * 1988-08-09 1990-02-15 Heraeus Elektroden Anode fuer kathodischen korrosionsschutz
GB9312431D0 (en) * 1993-06-16 1993-07-28 Aston Material Services Ltd Improvements in and relating to protecting reinforced concrete

Also Published As

Publication number Publication date
CZ20002437A3 (cs) 2001-07-11
DE69928373D1 (de) 2005-12-22
HK1049503B (zh) 2005-11-18
NO323184B1 (no) 2007-01-15
PL348189A1 (en) 2002-05-06
AU752647B2 (en) 2002-09-26
CN1195897C (zh) 2005-04-06
TR200002510T1 (tr) 2001-04-20
BR9907086A (pt) 2000-10-17
ATE310110T1 (de) 2005-12-15
ID26715A (id) 2001-02-01
JP2002528647A (ja) 2002-09-03
CN1376213A (zh) 2002-10-23
ES2253931T3 (es) 2006-06-01
TW581826B (en) 2004-04-01
PL195262B1 (pl) 2007-08-31
DE69928373T2 (de) 2006-08-03
NZ505421A (en) 2002-11-26
CA2316983A1 (en) 2000-05-11
JP4491139B2 (ja) 2010-06-30
CZ295912B6 (cs) 2005-11-16
EP1042535A1 (en) 2000-10-11
CA2316983C (en) 2007-01-09
HK1049503A1 (en) 2003-05-16
BR9907086B1 (pt) 2009-08-11
WO2000026439A2 (en) 2000-05-11
NO20003386D0 (no) 2000-06-28
NO20003386L (no) 2000-08-24
WO2000026439A3 (en) 2000-10-19
AU1393800A (en) 2000-05-22

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