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 according to claim 1 for Improve the corrosion resistance by using a thermal Spray layer made of metals, especially zinc or Zinc alloys, coated reinforced concrete.
• Thermal spray coatings made of zinc or zinc aluminum alloys are used for surface finishing of metals, plastics, Concrete, cardboard etc. used. Among other things, they improve the temperature resistance, the wear behavior and the electrical conductivity of the substrate materials.
• EP-A-0 677 592 the adhesive strength of thermal spray coatings Metals, metal oxides or hard materials, especially of zinc, Aluminum and its alloys, the spray layers after spraying with a one-component, moisture-curing Be coated with polyurethane resin. Special meaning has achieved this procedure for steel workpieces. It is mentioned that on the polyurethane resin layer so applied usual coating systems can be applied, which are compatible with polyurethane resins. examples for this are not known. But it had already been observed that Materials such as alkyd resins, epoxy resins or PVC resins without the Polyurethane resin layer not on the metal spray layers adhere sufficiently.
• the present invention has set itself the task Improve the corrosion resistance by using a thermal Spray layer made of metals, especially zinc or Zinc alloys, coated reinforced concrete are available too ask, if possible also the adhesive strength of the Spray layer on the concrete should be improved.
• Spray coating with the reinforcement of the reinforced concrete electrically is connected and additionally with a polyurethane resin is coated, which as a low-viscosity solution in organic Solvents is applied.
• the polyurethane resin layer is preferably applied so thinly that no closed film is formed, only the pores of the spray layer are closed.
• the polyurethane resin also has an epoxy resin layer is applied.
• This epoxy resin layer is applied that they preferably have a thickness of 200 to 400 ⁇ m.
• Polyurethane layers are also well suited as well as layers of mixtures of epoxy resins and polyurethanes.
• the spray layer made of zinc or zinc alloys on the concrete is generally 100 to 400 microns, preferably 150 to 300 ⁇ m. Spray layers of this type exhibit adhesive strength measurements by means of forehead deduction between 1.0 and 2.0 MPa. After the application of the polyurethane resin layer, the adhesion increases the zinc layer on the concrete surprisingly to 2.5 to 3.0 MPa. Is a after curing the polyurethane layer Epoxy resin layer are applied after they have hardened Adhesive strengths measured between 2.5 and 3.5 MPa.
• the invention applied layer with the reinforcement of the reinforced concrete is electrically connected. To do this, it is necessary electrically conductive connection between the metal reinforcement of the Manufacture reinforced concrete and the surface of the concrete. This is a measure that has so far been carried out hesitantly, because parts of the reinforcement that are not covered with cement of the outside world and actually as flaws be viewed where there is particularly rapid corrosion of the reinforced concrete comes.
• the method is that by coating with polyurethane resin not only the adhesive strength of the spray layer the concrete is improved, but also the lifespan of the Spray coating.
• the self-corrosion of the zinc layer when wet Weather conditions are greatly reduced and thus the Life span of the spray layer increased.
• Corrosion tests in the Salt spray test according to DIN 50121-SS have shown that a 100 microns 60% of the thick layer is removed after 336 hours. After the application of the polyurethane resin layer, the removal is the zinc spray coating only 13%. If an additional If the epoxy resin layer is applied, the inherent corrosion decreases the spray layer to practically 0.
• Spraying methods are used, for example wire flame spraying or wire arc spraying. This procedure differ mainly by different process temperatures and therefore also through different order efficiencies.
• the adhesive strengths on the concrete don't just depend on the Surface pretreatment, but also on the type of protective concrete.
• the spray layers are depending on the thickness and Spray type more or less dense. To a sufficient To ensure corrosion protection, the thicknesses should be preferred are in the range between 150 and 300 ⁇ m.
• Epoxy resin can be achieved, such as the paint Amerlock 400 GFR from Ameron, USA for excellent results has led.
• This additional epoxy resin layer will especially used when it was mechanically heavily loaded Areas. Layers of are also well suited Polyurethane or mixtures of epoxy resins and polyurethanes.
• a new structure made of reinforced concrete is prepared by means of compressed air jets up to the Sa3 degree of cleaning and an average roughness depth R z of 45 ⁇ m. Then 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 means of forehead deduction result in 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.
• the Polyurethane layer had hardened, part of the Additionally coated with an epoxy resin layer.
• the Amerlock 400 GFA material was used in layers between 200 and 400 ⁇ m. After curing this second Layer, the adhesive strength was 2.5 to 3.5 MPa.
• Example 2 The same zinc spray coating as in Example 1 was used immediately coated with the epoxy resin.
• the adhesive strength measurement using the forehead trigger remains at 1.0 to 2.0 MPa.
• the Adhesive strength of the epoxy layer on the zinc layer was not resistant.
• Anchor arches in need of renovation in a seaport first externally freed from corroded concrete until the Reinforcement bars are exposed. They are welded together that they are overall electrically conductive with each other are connected. Electrical lines are also installed and isolated. Then repair mortar in applied up to 10 cm thick. After setting a 300 ⁇ m thick spray layer is applied to this as in Example 1 applied from zinc and then with the low viscosity PUR coating solution coated, but for that Care is taken to ensure that there is no electrically conductive contact between the reinforcing bars and the zinc layer. The the zinc layer applied in this way acts as a sacrificial anode. Through the subsequent coating with the PUR solution increases the mechanical stability of the coating. Then the Surface as in example 1 covered with an epoxy resin layer, which has an average thickness of 400 microns. It arises such a highly resistant to sea water and other corrosion Surface providing long-term protection of the concrete and the reinforcement bars stored in it.

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

Applications Claiming Priority (3)

Publications (2)

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Family Applications (1)

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Families Citing this family (10)

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• 1997
  • 1997-10-31 DE DE19748105A patent/DE19748105C1/de not_active Expired - Lifetime
• 1998
  • 1998-10-14 US US09/509,837 patent/US6224943B1/en not_active Expired - Lifetime
  • 1998-10-14 CN CNB988102994A patent/CN1207444C/zh not_active Expired - Fee Related
  • 1998-10-14 DE DE59802985T patent/DE59802985D1/de not_active Expired - Lifetime
  • 1998-10-14 CA CA002307831A patent/CA2307831C/en not_active Expired - Fee Related
  • 1998-10-14 IL IL13573998A patent/IL135739A/en not_active IP Right Cessation
  • 1998-10-14 AU AU97501/98A patent/AU745500B2/en not_active Ceased
  • 1998-10-14 DK DK98951521T patent/DK1027478T3/da active
  • 1998-10-14 EP EP98951521A patent/EP1027478B1/de not_active Expired - Lifetime
  • 1998-10-14 TR TR2000/01150T patent/TR200001150T2/xx unknown
  • 1998-10-14 PT PT98951521T patent/PT1027478E/pt unknown
  • 1998-10-14 WO PCT/EP1998/006512 patent/WO1999023282A1/de active IP Right Grant
  • 1998-10-14 BR BR9813171-0A patent/BR9813171A/pt not_active IP Right Cessation
  • 1998-10-14 ES ES98951521T patent/ES2172223T3/es not_active Expired - Lifetime
• 2000
  • 2000-04-26 NO NO20002130A patent/NO319769B1/no not_active IP Right Cessation
  • 2000-12-18 HK HK00108156A patent/HK1028795A1/xx not_active IP Right Cessation

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