EP0059023B1 - Verfahren zur Verbesserung der Korrosionsbeständigkeit eiserner Gegenstände - Google Patents

Verfahren zur Verbesserung der Korrosionsbeständigkeit eiserner Gegenstände Download PDF

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Publication number
EP0059023B1
EP0059023B1 EP19820300025 EP82300025A EP0059023B1 EP 0059023 B1 EP0059023 B1 EP 0059023B1 EP 19820300025 EP19820300025 EP 19820300025 EP 82300025 A EP82300025 A EP 82300025A EP 0059023 B1 EP0059023 B1 EP 0059023B1
Authority
EP
European Patent Office
Prior art keywords
coating
copper
metal body
corrosion
layer
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
Application number
EP19820300025
Other languages
English (en)
French (fr)
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EP0059023A1 (de
Inventor
Cyril Francis Drake
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of EP0059023A1 publication Critical patent/EP0059023A1/de
Application granted granted Critical
Publication of EP0059023B1 publication Critical patent/EP0059023B1/de
Expired 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
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D3/00—Chemical treatment of the metal surfaces prior to coating

Definitions

  • This invention relates to corrosion inhibition and in particular to the prevention or inhibition of the corrosion of ferrous metals.
  • the invention also relates to ferrous metal piece parts provided with such corrosion protection.
  • Ferrous metals are employed in the construction of reinforcing member in a variety of building and constructional operations.
  • the metal is used in the form of rods or wires which are embedded in concrete to form a structure having both tensile and compressive strength.
  • Such reinforced concrete structures are employed e.g. in the construction of roadways, bridges, tunnels and buildings. In applications where a high load is to be applied to the reinforced structure it is often prestressed by applying tension to the reinforcing metal 'skeleton' thus enhancing the load bearing properties of the structure.
  • a problem associated with all ferrous metal structures is that of corrosion and consequent deterioration of the load bearing properties of the structure. This problem is particularly acute when the metal is in contact with or embedded in a building material such as cement or concrete.
  • the commonly used building cements and concretes are strongly alkaline when freshly mixed with water and are highly corrosive in nature.
  • a ferrous material is immediately attacked during the setting process and, as small traces of water remain in contact with the metal, this attack continues throughout the life of the composite structure. In some cases this can lead to the ultimate failure of the reinforcement.
  • the object of the invention is to minimise or to overcome these disadvantages.
  • a ferrous metal body having a corrosion inhibiting surface coating, said coating including a layer of copper in contact with the metal surface and an external layer wholly or partially comprising a material having corrosion inhibiting properties, characterised in that said corrosion inhibiting material comprises a water soluble phosphorus pentoxide/zinc oxide/alumina glass.
  • a method of inhibiting corrosion of a ferrous metal surface including applying a coating of copper to the surface, and covering the copper with a corrosion inhibiting coating, characterised in that said coating wholly or partially comprises a water soluble phosphorus pentoxide/zinc oxide/alumina glass.
  • the corrosion inhibiting material comprises a water soluble glass.
  • the coating plant shown in Figure 1 is intended for the treatment of e.g. steel rod or wire, or wire products, in continuous lengths. It will however be clear to those skilled in the art that the process can be readily adjusted to the treatment of ferrous metals in other forms such as tube and sheet.
  • the wire or wire product 11 to be treated is fed from a storage reel 12 through an electroplating bath 13 where a flash coating 21 (Fig. 2) of copper is deposited on the metal surface.
  • a flash coating 21 (Fig. 2) of copper is deposited on the metal surface.
  • an electric current is fed to the wire product 11 via one or more brush contacts 14, the current being fed via the wire through the electrolytic solution in the bath 13 to a copper anode 15.
  • the thickness of the electrodeposited copper coating 21 can be determined by controlling both the site at which the wire product is fed through the plating bath 13 and the electroplating current. Typically this thickness will be in the range 0.01 to 1 pm although the thickness of the copper layer is not critical.
  • the wire 11 passes, preferably via a washing and drying station 16 where electrolyte residues are removed, to a coating station 17 where the copper coated wire is provided with an outer corrosion inhibiting coating 22 (Fig. 2) comprising wholly or partially a water soluble glass housing corrosion inhibiting properties.
  • the glass is of the phosphorus pentoxide type and comprises phosphorus pentoxide/zinc oxide/alumina glass, such glass being described in our published United Kingdom specification No. 1,604,383.
  • the glass is applied as a powder dispersed in a paint resin, but other coating techniques may also be employed.
  • the glass may be applied as a fine powder from a fluidized bed followed by fusion of the glass to provide a uniform surface layer. Other coating methods will be apparent to those skilled in the art.
  • the coated wire 11 is wound on to a storage reel 18.
  • the corrosion inhibited ferrous metal products manufactured by the plant of Figure 1 may be employed in a variety of applications in hostile environments where unprotected ferrous metals would be subject to rapid corrosion.
  • the corrosion inhibited metal product is in the form of rods or wires which are employed as the reinforcing elements in cement and concrete structures; the corrosion inhibiting glass prevents attack of the ferrous metal during the concrete setting process and continues this protection for an extended period while the structure is in service.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Claims (10)

1. Eisenmetallkörper mit einem Korrosionsschutzüberzug, der eine in Kontakt mit der Metalloberfläche befindliche Kupferschicht und eine ganz oder teilweise aus- einem Korrosionsinhibitor bestehende äußere Schicht aufweist, dadurch gekennzeichnet, daß der Korrosionsinhibitor ein wasserlösliches Phosphorpentoxid-Zinkoxid-Aluminiumoxid-Glas ist.
2. Metallkörper nach Anspruch 1, dadurch gekennzeichnet, daß das Glas in Form eines in einem Lackharz dispergierten Pulvers vorliegt.
3. Metallkörper nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Kupferschicht eine galvanisch aufgebrachte Schicht ist.
4. Metallkörper nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Dicke der Kupferschicht 0.01 bis 1 pm beträgt.
5. Metallkörper nach einem der Ansprüche 1 bis 4 und in Form eines Drahtes oder Drahtprodukts.
6. Zement- oder Betonkonstruktion, die mit einem Draht oder Drahtprodukt nach Anspruch 5 bewehrt ist.
7. Verfahren zum Schutz einer Eisenmetalloberfläche gegen Korrosion, bei dem eine Kupferschicht auf die Oberfläche aufgebracht wird und das Kupfer mit einem Korrosionsschutzüberzug versehen wird, dadurch gekennzeichnet, daß der Überzug ganz oder teilweise aus wasserlöslichem Phosphorpentoxid-Zinkoxid-Aluminiumoxid-Glas besteht.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß die Kupferschicht galvanisch aufgebracht wird.
9. Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die Dicke der Kupferschicht 0.01 bis 1 pm beträgt.
10. Verfahren nach Anspruch 7, 8 oder 9, dadurch gekennzeichnet, daß das Glas in Form eines in einem Lackharz dispergierten Pulvers aufgebracht wird.
EP19820300025 1981-01-16 1982-01-05 Verfahren zur Verbesserung der Korrosionsbeständigkeit eiserner Gegenstände Expired EP0059023B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8101306 1981-01-16
GB8101306A GB2091130B (en) 1981-01-16 1981-01-16 Corrosion inhibition

Publications (2)

Publication Number Publication Date
EP0059023A1 EP0059023A1 (de) 1982-09-01
EP0059023B1 true EP0059023B1 (de) 1986-04-30

Family

ID=10519008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820300025 Expired EP0059023B1 (de) 1981-01-16 1982-01-05 Verfahren zur Verbesserung der Korrosionsbeständigkeit eiserner Gegenstände

Country Status (4)

Country Link
EP (1) EP0059023B1 (de)
JP (1) JPS57145166A (de)
DE (1) DE3270821D1 (de)
GB (1) GB2091130B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6089357A (ja) * 1983-10-22 1985-05-20 日本ペイント株式会社 水素吸収抑制塗装鋼材およびその製法
FR2844282A1 (fr) * 2002-09-06 2004-03-12 Usinor Objet en acier muni d'un revetement composite a base d'email et procede de fabrication

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2417885A (en) * 1943-10-02 1947-03-25 Carbide & Carbon Chem Corp Process for coating copper with vinyl resins
FR1469571A (fr) * 1966-01-04 1967-02-17 Perfectionnements apportés aux procédés d'émaillage sur tôles
LU65195A1 (de) * 1972-04-19 1973-05-15

Also Published As

Publication number Publication date
GB2091130A (en) 1982-07-28
JPS57145166A (en) 1982-09-08
GB2091130B (en) 1984-06-27
EP0059023A1 (de) 1982-09-01
DE3270821D1 (en) 1986-06-05

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