WO1992002664A1 - Anode destinee a etre chargee electriquement pour empecher la corrosion de structures en beton arme et procede empechant la corrosion electrique utilisant une telle anode - Google Patents

Anode destinee a etre chargee electriquement pour empecher la corrosion de structures en beton arme et procede empechant la corrosion electrique utilisant une telle anode Download PDF

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Publication number
WO1992002664A1
WO1992002664A1 PCT/JP1990/001024 JP9001024W WO9202664A1 WO 1992002664 A1 WO1992002664 A1 WO 1992002664A1 JP 9001024 W JP9001024 W JP 9001024W WO 9202664 A1 WO9202664 A1 WO 9202664A1
Authority
WO
WIPO (PCT)
Prior art keywords
reinforced concrete
anode
plate
corrosion
anode member
Prior art date
Application number
PCT/JP1990/001024
Other languages
English (en)
Japanese (ja)
Inventor
Makoto Kurokawa
Susumu Watanabe
Original Assignee
Nakagawa Corrosion Protecting 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 Nakagawa Corrosion Protecting Co., Ltd. filed Critical Nakagawa Corrosion Protecting Co., Ltd.
Priority to PCT/JP1990/001024 priority Critical patent/WO1992002664A1/fr
Publication of WO1992002664A1 publication Critical patent/WO1992002664A1/fr
Priority to GB9207501A priority patent/GB2253414B/en

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
    • C23F13/18—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
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • 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 a galvanic anode member for electrolytically protecting a steel material in a reinforced concrete structure that is always in the atmosphere, and a reinforced concrete using the same. G) Regarding the method of cathodic protection of structures.
  • the defects in the concrete, the unevenness of the density, and the difference in the geometrical structure cause the A corrosion cell, which corrodes the steel material in the structure and cracks the concrete due to the corrosive expansion of the mesh material due to the corrosion. And structural defects such as further corrosion of the netting. This is known to be accelerated by exposing the structure to salty hair.
  • Cathodic protection is the most effective way to protect the nets in such reinforced concrete structures.
  • the conventional cathodic protection method for example, when protecting the reinforced concrete of the bridge deck, the concrete of the bridge deck is used. Drilling grooves at intervals of 127 to 457 restaurants, installing zinc ribbons (5 radians), and filling the grooves with mortar or concrete A mortar (thickness of about 13 restaurants) is laid on the bridge deck, and a large number of zinc sheets are drilled on the bridge deck so that 22 holes are drilled at a rate of 60% before the mortar hardens. There is a method of laying on the entire surface of the plate and covering it with concrete (this method is applied to the floor).
  • the method of laying zinc ribs in the above-mentioned trenches is limited to the method of laying zinc plates, because the surface area of zinc is insufficient and sufficient anticorrosion current cannot be obtained.
  • this method has the following problems in terms of construction and performance.
  • the purpose of the present invention is to solve the problems of the related art, and to provide a galvanic anode and a galvanic anode which can effectively and effectively protect a steel material in a reinforced concrete structure for a long period of time. And to provide a cathodic protection method.
  • the present invention relates to a galvanic anode member for protecting a steel material in a reinforced concrete structure from corrosion, in which a protective plate, a waterproof material, a galvanic anode plate, and a water retaining material are sequentially provided from the outside. It is laminated integrally and can be attached to the reinforced concrete surface with a fixture.
  • the fixture is made of metal, and the fixture is electrically connected to the galvanic anode plate.
  • the current-carrying anode member of the present invention is easy to transport because the protective plate, the waterproofing material, the current-carrying anode plate, and the water retention material are previously laminated integrally, and is easy to carry. It can be applied to surfaces and walls, making it easy to repair when the galvanic anode is exhausted. Yes.
  • the resistance between the anode and the Z-metal can be reduced, and the potential difference between the anode plate and the steel material can be used effectively.
  • the size of such an anode member should be easy to transport, and it should be installed on the concrete surface of the structure with a fixing tool. This makes it easier and more effective and more effective for cathodic protection.
  • the metal fasteners When metal fasteners are used as the fasteners, the metal fasteners can be protected from corrosion, which gives the fasteners a long service life. You can do it. In this case, if the metal fixture is installed on the reinforced concrete, it depends on the length and thickness of the fixture, but there is a considerable probability that the metal fixture and steel ( (Corrosion prevention), and the corrosion prevention effect of the net material is further improved.
  • the entire surface of the anode plate has a uniform surface pressure and comes into contact with the concrete surface. It is a rigid plate that protects the anode plate against the streets hit by the outside world, and is used to protect the anode plate.
  • FRP, asbestos straight, fiber-reinforced concrete Cleats and corrosion-resistant metal plates can be used.
  • the waterproofing material blocks permeation of water, oxygen, and salt from the protective plate or from a gap between the protective plate and the anode plate, and prevents self-corrosion of the anode plate.
  • the waterproof material itself has adhesiveness, and has a function of bonding the anode plate and the protection plate, and a function of adding the protection plate. It is even more desirable to combine this with the ability to mitigate physical shock.
  • rubber phenol sheet strength is optimal, but double-sided adhesive tape may be used.
  • the galvanic anode plate has a sacrificial anode effect, such as a Zn, At, or ⁇ g alloy, and is preferably a Zn or Zn alloy because of its ease of forming into a plate.
  • a zinc plate having a thickness of 1 to 2 mm, the thickness of which is appropriately selected from the above range according to the anticorrosion period.
  • the water retention material reduces the gap between the anode plate and the concrete surface, lowers the electrical resistance at this interface, and prevents the increase in resistance due to the accumulation of corrosion products on the anode plate.
  • This water retention material is plastic, retains moisture even in the air, and is desired to be a conductive material.
  • bentonite and a hygroscopic electrolyte are kneaded with water, specifically, aluminum dihydrate, metal sulfate, and magnesium chloride.
  • Such back files are disclosed in Japanese Patent Application Laid-Open No. 2-83833. This kind of nox file has fluidity, so if it is applied to a wall, etc., put a non-woven fabric etc. between the back files to prevent dripping. This is what you want.
  • a high absorption sheet containing a superabsorbent polymer can be used.
  • a sheet formed by sandwiching a highly absorbent polymer powder such as polyacrylic acid and pulp between two sheets of water-absorbing paper or nonwoven fabric This is due to the high pulp absorption rate and the excellent polymer. It has good absorption and holding power, and its workability is better than that of the backfill because of the sheet shape.
  • FIG. 1 is an explanatory cross-sectional view of a configuration of a galvanic anode member according to the present invention and a case where the galvanic anode member is installed on a surface of a reinforcing concrete.
  • the galvanic anode member according to the present invention was applied to the reinforced concrete girder and the back of the floor slab at the upper part of the pier, and the steel material in the reinforced concrete was subjected to electrolytic protection.
  • a multi-plate anode member sized to be portable by hand was placed on the surface to be protected against corrosion.
  • Each anode member is provided with a mounting hole.
  • the structure of such an anode member is as shown in FIG. That is, as the anode member, a flexible plate (asbestos plate) 3 having a thickness of 6 organs is used as a protection plate, and the flexible plate 3 is provided with one thick plate.
  • the flexible plate 3 and the zinc plate 5 as a galvanic anode plate were bonded together by a rubber-fault sheet 4 as a waterproof material having double-sided adhesive.
  • the thickness of the zinc plate 5 is set at one restaurant, but it can be selected as appropriate according to the design life.
  • a backing film 6 was applied to a zinc plate 5 as a water retaining material to a thickness of 5 places in advance.
  • Such an anode member is penetrated through an anchor bolt 2 which has been set in advance in accordance with the mounting hole, so that the concrete surface is covered.
  • An electrical connection was made between the anchor bolt 2 and the zinc plate 5 by means of a connecting nut 8 via a toothed washer 7.
  • the anode member is tightened and fixed to the concrete surface with the mounting nut 10 via the plate 9, and the head of the bolt 2 and the nut 1 are fixed. 0 was protected by cap 1 1.
  • a nonwoven fabric was interposed in the backfill to prevent sagging of the backfill.
  • each of the anode members provided with K was connected with a lead wire sequentially, and the last (terminal) lead wire was connected to the reinforcing steel.
  • a reference electrode was buried in concrete for some of the girders and the back of the slab, and this lead wire and the nearby anode member It was started up to a place where the lead wire of the rebar could be entered, and the potential of the rebar could be measured at any time.
  • the present inventors have confirmed that when an anchor bolt is cast by the method of the present invention, the bolt contacts the reinforcing steel at a ratio of 1Z5. Accordingly, the bolt is prevented from being corroded by electrically connecting the bolt to the zinc plate 5 with the toothed washer 7 and the connecting nut 8.
  • the step of connecting the lead wire to the reinforcing bar can be omitted.
  • the anticorrosion current was cut off from a sufficiently polarized state, and the amount of repolarization was measured.
  • Depolarization amount is
  • the conventional galvanic anode method is very difficult or impossible. It has the effect that it can be applied to the vertical surface of the ceiling.
  • the method of the present invention in which the divided small-area anode member is fixed with an anchor bolt requires a large-scale apparatus and machine. It has the effect that it is easy to work on objects with poor working environment, such as piers and bridge lower parts.

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

L'invention se rapporte à une anode qui est destinée à être chargée électriquement pour empêcher la corrosion des parties en acier d'une structure en béton armé et qui se caractérise en ce qu'elle comprend une plaque protectrice, un matériau étanche à l'eau, une plaque d'anode destinée à être chargée électriquement et un élément de barrière contre l'eau, disposés en couches stratifiées solidaires les uns sur les autres dans l'ordre mentionné ci-dessus dans le sens allant du côté extérieur vers le côté intérieur, et en ce qu'elle peut être montée sur la surface de la structure en béton armé au moyen d'un organe de fixation; ainsi qu'à un procédé empêchant la corrosion qui utilise une telle anode.
PCT/JP1990/001024 1990-08-10 1990-08-10 Anode destinee a etre chargee electriquement pour empecher la corrosion de structures en beton arme et procede empechant la corrosion electrique utilisant une telle anode WO1992002664A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP1990/001024 WO1992002664A1 (fr) 1990-08-10 1990-08-10 Anode destinee a etre chargee electriquement pour empecher la corrosion de structures en beton arme et procede empechant la corrosion electrique utilisant une telle anode
GB9207501A GB2253414B (en) 1990-08-10 1992-04-06 Galvanic anode assembly and method for reinforcing steel in a concrete structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1990/001024 WO1992002664A1 (fr) 1990-08-10 1990-08-10 Anode destinee a etre chargee electriquement pour empecher la corrosion de structures en beton arme et procede empechant la corrosion electrique utilisant une telle anode

Publications (1)

Publication Number Publication Date
WO1992002664A1 true WO1992002664A1 (fr) 1992-02-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1990/001024 WO1992002664A1 (fr) 1990-08-10 1990-08-10 Anode destinee a etre chargee electriquement pour empecher la corrosion de structures en beton arme et procede empechant la corrosion electrique utilisant une telle anode

Country Status (2)

Country Link
GB (1) GB2253414B (fr)
WO (1) WO1992002664A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100178355A1 (en) * 2006-11-30 2010-07-15 Hoemann Caroline D Method for in situ solidification of blood-polymer compositions for regenerative medicine and cartilage repair applications

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7967971B2 (en) 2008-03-11 2011-06-28 Nigel Davison Discrete sacrificial anode assembly
WO2012100772A1 (fr) 2011-01-28 2012-08-02 Vestas Wind Systems A/S Composant de turbine éolienne qui présente une structure de protection contre la corrosion, et turbine éolienne comprenant ce dernier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6452090A (en) * 1987-05-08 1989-02-28 Eltech Systems Corp Anode ribbon system for cathodic corrosionproofness of steel reinforced concrete

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6452090A (en) * 1987-05-08 1989-02-28 Eltech Systems Corp Anode ribbon system for cathodic corrosionproofness of steel reinforced concrete

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100178355A1 (en) * 2006-11-30 2010-07-15 Hoemann Caroline D Method for in situ solidification of blood-polymer compositions for regenerative medicine and cartilage repair applications

Also Published As

Publication number Publication date
GB2253414B (en) 1994-09-21
GB2253414A (en) 1992-09-09
GB9207501D0 (en) 1992-05-20

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