EP1027478A1 - Procede permettant d'augmenter la resistance a la corrosion du beton arme - Google Patents

Procede permettant d'augmenter la resistance a la corrosion du beton arme

Info

Publication number
EP1027478A1
EP1027478A1 EP98951521A EP98951521A EP1027478A1 EP 1027478 A1 EP1027478 A1 EP 1027478A1 EP 98951521 A EP98951521 A EP 98951521A EP 98951521 A EP98951521 A EP 98951521A EP 1027478 A1 EP1027478 A1 EP 1027478A1
Authority
EP
European Patent Office
Prior art keywords
layer
zinc
spray
polyurethane resin
reinforced concrete
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.)
Granted
Application number
EP98951521A
Other languages
German (de)
English (en)
Other versions
EP1027478B1 (fr
Inventor
Michael Knepper
Jochen Spriestersbach
Jürgen Wisniewski
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.)
Grillo Werke AG
Original Assignee
Grillo Werke AG
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 Grillo Werke AG filed Critical Grillo Werke AG
Publication of EP1027478A1 publication Critical patent/EP1027478A1/fr
Application granted granted Critical
Publication of EP1027478B1 publication Critical patent/EP1027478B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment
    • 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
    • C23F2201/00—Type of materials to be protected by cathodic protection
    • C23F2201/02—Concrete, e.g. reinforced

Definitions

  • the present invention relates to a method for improving the corrosion resistance of reinforced concrete coated with a thermal spray coating of metals, in particular of zinc or zinc alloys.
  • Thermal spray coatings made of zinc or zinc aluminum alloys are used for the surface finishing of metals, plastics, concrete, cardboard etc. Among other things, they improve the temperature resistance, the wear behavior and the electrical conductivity of the substrate materials.
  • EP-A-0 677 592 discloses a method for improving the adhesive strength of thermal spray coatings made of metals, metal oxides or hard materials, in particular zinc, aluminum and their alloys, the spray coatings after spraying with a one-component, moisture-curing polyurethane resin be coated. This process has become particularly important for steel workpieces. It is mentioned that customary coating systems which are compatible with polyurethane resins can be applied to the polyurethane resin layer applied in this way. No examples of this are mentioned. However, it had already been observed that materials such as alkyd resins, epoxy resins or PVC resins would not adhere sufficiently to the metal spray layers without the polyurethane resin layer.
  • the present invention has for its object to improve the corrosion resistance of with a thermal spray layer made of metals, in particular zinc or To provide zinc alloys, coated reinforced concrete, where possible the adhesive strength of the sprayed layer on the concrete should also be improved.
  • the spray layer is electrically connected to the reinforcement of the reinforced concrete and is additionally coated with a polyurethane resin, which is applied as a low-viscosity solution in organic solvents.
  • the polyurethane resin layer is preferably applied so thinly that no closed film forms, but only the pores of the spray layer are closed.
  • an epoxy resin layer is additionally applied after the polyurethane resin has cured.
  • This epoxy resin layer is applied so that it preferably has a thickness of 200 to 400 microns after curing.
  • Polyurethane layers and layers of mixtures of epoxy resins and polyurethanes are also well suited.
  • the spray layer made of zinc or zinc alloys on the concrete is generally 100 to 400 ⁇ m, preferably 150 to 300 ⁇ m. Spray layers of this type have values between 1.0 and 2.0 MPa in the case of adhesive strength measurements by means of forehead deduction. After the application of the polyurethane resin layer, the adhesion of the zinc layer to the concrete surprisingly increases to 2.5 to 3.0 MPa. If an epoxy resin layer is applied after the polyurethane layer has hardened, adhesive strengths between 2.5 and 3.5 MPa are measured after it has hardened.
  • the layer applied according to the invention is electrically connected to the reinforcement of the reinforced concrete. For this it is necessary to establish an electrically conductive connection between the metal reinforcement of the reinforced concrete and the surface of the concrete. This is a measure that has so far only been carried out hesitantly, since parts of the reinforcement that are not covered by the cement are covered with the. Come into contact with the outside world and are actually regarded as defects where corrosion of the reinforced concrete occurs particularly quickly. According to the invention, it is also possible to use the layers as anodes for active cathodic corrosion protection with the aid of external current.
  • Another unforeseeable advantage of the method according to the invention is that the coating with polyurethane resin not only improves the adhesive strength of the spray layer on the concrete, but also the service life of the spray layer.
  • the self-corrosion of the zinc layer in damp weather conditions is greatly reduced and the service life of the spray layer is increased.
  • Corrosion tests in the salt spray test according to DIN 50121-SS have shown that a layer of 100 ⁇ m thickness is removed by 60% after 336 hours. After the application of the polyurethane resin layer, the removal of the zinc spray layer is only 13%. If an additional epoxy resin layer is applied, the intrinsic corrosion of the spray layer drops to practically 0.
  • the method according to the invention Before applying the spray layer made of metal, the method according to the invention must ensure that the reinforced concrete is cleaned beforehand, blasted, preheated to 70 ° to 90 ° C. and only then is the metal sprayed on.
  • the purity and roughness of the surface of the substrate are of particular importance. A certain sharpness of the profile is often even necessary to ensure the necessary adhesive strength. Preheating can only be dispensed with if it is ensured that the concrete surface is no longer damp. Otherwise the zinc spray coating will not have sufficient adhesive strength.
  • the metallic spraying materials for example wire flame spraying or wire arc spraying. This procedure differ primarily by different process temperatures and thus also by different application efficiencies.
  • the adhesive strength to the concrete depends not only on the surface preparation, but also on the type of concrete to be protected.
  • the spray layers are more or less dense depending on the thickness and type of spray. In order to ensure adequate protection against corrosion, the thicknesses should preferably be in the range between 150 and 300 ⁇ m.
  • a new structure made of reinforced concrete is prepared by means of compressed air jets up to the degree of cleaning Sa3 and an average roughness depth R z of 45 ⁇ m. Subsequently, the workpiece prepared in this way is cleaned of adhering contaminants as well as possible using compressed air, preheated to 70 to 90 ° C and provided with a 150 to 300 ⁇ m thick spray coating made of zinc.
  • the adhesive strength measurements carried out by pulling the forehead give values between 1.0 and 2.0 MPa.
  • the sprayed metal layer is then coated with a commercially available, low-viscosity 1-component PU coating solution using a brush so that no measurable layer build-up takes place.
  • part of the substrate was additionally coated with an epoxy resin layer.
  • the Amerlock 400 GFA material was used in layers between 200 and 400 ⁇ m thick. After this second layer had hardened, the adhesive strength was 2.5 to 3.5 MPa.
  • Example 2 The same zinc spray coating as in Example 1 was immediately coated with the epoxy resin.
  • the adhesive strength measurement by means of a forehead trigger remains at 1.0 to 2.0 MPa.
  • the adhesive strength of the epoxy layer on the zinc layer was not stable.
  • Anchor arches in need of renovation in a seaport are first externally freed of corroded concrete until the reinforcing bars are exposed. They are welded to one another in such a way that they are connected to one another in an electrically conductive manner. Electrical lines are also installed and insulated. Then repair mortar is applied in a thickness of up to 10 cm. After setting, a 300 ⁇ m thick spray layer made of zinc is applied to this, as in Example 1, and then coated with the low-viscosity PUR coating solution, care being taken, however, that no electrically conductive contact occurs between the reinforcing bars and the zinc layer. The zinc layer applied in this way acts as a sacrificial anode. The subsequent coating with the PUR solution increases the mechanical stability of the coating.
  • Example 1 The surface is then coated with an epoxy resin layer, as in Example 1, which has an average thickness of 400 ⁇ m. This creates a surface that is highly resistant to seawater and other corrosion, which ensures long-term protection of the concrete and the reinforcing bars embedded in it.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Aftertreatments Of Artificial And Natural Stones (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Abstract

Procédé permettant d'augmenter la résistance à la corrosion d'un béton armé recouvert d'une couche métallique appliquée par projection thermique, constituée notamment de zinc ou d'alliages de zinc. Le procédé est caractérisé par le fait que ladite couche est électriquement reliée à l'armature et qu'elle est recouverte d'une résine de polyuréthane, qui est appliquée sous la forme d'une solution de faible viscosité dans un solvant organique.
EP98951521A 1997-10-31 1998-10-14 Procede permettant d'augmenter la resistance a la corrosion du beton arme Expired - Lifetime EP1027478B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19748105 1997-10-31
DE19748105A DE19748105C1 (de) 1997-10-31 1997-10-31 Verfahren zur Verbesserung der Korrosionsbeständigkeit von Stahlbeton
PCT/EP1998/006512 WO1999023282A1 (fr) 1997-10-31 1998-10-14 Procede permettant d'augmenter la resistance a la corrosion du beton arme

Publications (2)

Publication Number Publication Date
EP1027478A1 true EP1027478A1 (fr) 2000-08-16
EP1027478B1 EP1027478B1 (fr) 2002-01-30

Family

ID=7847187

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98951521A Expired - Lifetime EP1027478B1 (fr) 1997-10-31 1998-10-14 Procede permettant d'augmenter la resistance a la corrosion du beton arme

Country Status (14)

Country Link
US (1) US6224943B1 (fr)
EP (1) EP1027478B1 (fr)
CN (1) CN1207444C (fr)
AU (1) AU745500B2 (fr)
BR (1) BR9813171A (fr)
CA (1) CA2307831C (fr)
DE (2) DE19748105C1 (fr)
DK (1) DK1027478T3 (fr)
ES (1) ES2172223T3 (fr)
IL (1) IL135739A (fr)
NO (1) NO319769B1 (fr)
PT (1) PT1027478E (fr)
TR (1) TR200001150T2 (fr)
WO (1) WO1999023282A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2818274B1 (fr) 2000-12-18 2003-02-14 Alto Btp Procede de protection, de reparation et de consolidation d'ouvrages d'arts comportant des elements metalliques inclus dans une matrice en beton, platre, ciment ou mortier
US6592947B1 (en) 2002-04-12 2003-07-15 Ford Global Technologies, Llc Method for selective control of corrosion using kinetic spraying
CA2530190A1 (fr) * 2003-07-03 2005-01-13 Grillo-Werke Ag Protection de surface multicouche pour du beton arme, destinee a ameliorer la protection contre la corrosion d'edifices en beton arme ou de parties structurales en beton arme, et procede de production de ladite protection
CN1871311A (zh) * 2003-10-27 2006-11-29 普立万公司 含碳质导电介质的阴极保护涂层
US7838079B2 (en) * 2004-11-17 2010-11-23 Battelle Energy Alliance, Llc Coated armor system and process for making the same
DE102007033423B4 (de) * 2007-07-18 2015-10-08 Torkret Gmbh Schutzeinrichtung für korrosionsgefährdete, befahrbare Parkhausbodenflächen aus Stahlbeton
EP2072205A1 (fr) 2007-12-17 2009-06-24 Rovalma SA Procédé pour la fabrication de pièces à demande mécanique élevée et en particulier des outils à partir de céramique ou polymères de faible coût
CN103088282A (zh) * 2013-02-05 2013-05-08 华北水利水电学院 不锈钢表面热喷涂纳米硬质合金-聚氨酯复合涂层的方法
WO2016179102A1 (fr) * 2015-05-01 2016-11-10 Valspar Sourcing, Inc. Revêtement texturé à haute performance
CN106738234A (zh) * 2016-11-15 2017-05-31 黄河科技学院 一种耐腐蚀预制装配式钢筋混凝土检查井的生产工艺

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
GB2140456A (en) * 1982-12-02 1984-11-28 Taywood Engineering Limited Cathodic protection
US4506485A (en) * 1983-04-12 1985-03-26 State Of California, Department Of Transportation Process for inhibiting corrosion of metal embedded in concrete and a reinforced concrete construction
US4619557A (en) * 1984-05-02 1986-10-28 Conoco Inc. Corrosion protection for mooring and riser elements of a tension leg platform
US5069822A (en) 1987-06-15 1991-12-03 Callaghan Thomas M Protective coating for reinforced concrete
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
JPH01224285A (ja) * 1988-03-02 1989-09-07 Hokushin Doken Kk コンクリート表面への耐久性にすぐれた皮膜の製造方法
DD275487A1 (de) * 1988-09-12 1990-01-24 Freiberg Brennstoffinst Anode fuer den katodischen korrosionsschutz von stahl- oder spannbeton
CA2040610A1 (fr) * 1990-05-21 1991-11-22 John E. Bennett Appareil permettant de neutraliser les ions chlorure presents dans des ouvrages en beton arme
GB9215502D0 (en) 1992-07-21 1992-09-02 Ici Plc Cathodic protection system and a coating and coating composition therefor
JP3040613B2 (ja) 1992-10-07 2000-05-15 大日本塗料株式会社 鉄筋コンクリート構造物の防食方法
US5879817A (en) 1994-02-15 1999-03-09 Eltech Systems Corporation Reinforced concrete structure
ATE175246T1 (de) * 1994-04-14 1999-01-15 Grillo Werke Ag Verfahren zur verbesserung der haftfestigkeit von thermischen spritzschichten aus metallen, metalloxiden und hartstoffen

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Also Published As

Publication number Publication date
WO1999023282A1 (fr) 1999-05-14
US6224943B1 (en) 2001-05-01
CN1276839A (zh) 2000-12-13
CA2307831A1 (fr) 1999-05-14
IL135739A (en) 2004-09-27
DK1027478T3 (da) 2002-05-21
DE59802985D1 (de) 2002-03-14
CN1207444C (zh) 2005-06-22
PT1027478E (pt) 2002-06-28
DE19748105C1 (de) 1998-10-29
AU745500B2 (en) 2002-03-21
TR200001150T2 (tr) 2000-08-21
HK1028795A1 (en) 2001-03-02
AU9750198A (en) 1999-05-24
BR9813171A (pt) 2000-08-22
ES2172223T3 (es) 2002-09-16
IL135739A0 (en) 2001-05-20
NO20002130L (no) 2000-04-26
NO20002130D0 (no) 2000-04-26
EP1027478B1 (fr) 2002-01-30
NO319769B1 (no) 2005-09-12
CA2307831C (fr) 2006-12-12

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