EP0755462B1 - Korrosionsinhibierung und verbesserung der verbundeigenschaften von armierungsmetallen - Google Patents

Korrosionsinhibierung und verbesserung der verbundeigenschaften von armierungsmetallen Download PDF

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Publication number
EP0755462B1
EP0755462B1 EP96904249A EP96904249A EP0755462B1 EP 0755462 B1 EP0755462 B1 EP 0755462B1 EP 96904249 A EP96904249 A EP 96904249A EP 96904249 A EP96904249 A EP 96904249A EP 0755462 B1 EP0755462 B1 EP 0755462B1
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EP
European Patent Office
Prior art keywords
metal
concrete
aqueous
metals
improvement
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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
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EP96904249A
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English (en)
French (fr)
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EP0755462A1 (de
Inventor
Manfred Akstinat
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Cement Intellectual Property Ltd CIP
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Cement Intellectual Property Ltd CIP
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Anticipated expiration legal-status Critical
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/015—Anti-corrosion coatings or treating compositions, e.g. containing waterglass or based on another metal
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment

Definitions

  • the present invention relates to a method for simultaneous Corrosion inhibition and improvement of the bond properties of Reinforcing metals for concrete and the use of such treated reinforcing metals.
  • D1 that is to say US Pat. No. 2,992,131, describes a method for simultaneously inhibiting corrosion and improving the composite properties of reinforcing metals (iron metal) for concrete by means of an Fe, Zn or Mn phosphating (see claims 1 and 3; column 3 , Lines 5 - 22).
  • the phosphated metal can be post-treated with compositions which contain chromates and / or glyoxal (a known corrosion inhibitor) - see claims 3 and 5.
  • a reinforcing iron is initially phosphated.
  • An oil layer is then applied to the metal surface pretreated in this way and dries out after a certain time.
  • the inside of the above-mentioned shell is initially phosphated and then with a soap consisting of an aqueous solution of Na stearate and palmitate, sprayed.
  • the phosphating step according to the invention is known per se Metal phosphate baths, especially in Fe, Zn, Zn / Ca or Mn phosphate baths executed.
  • Chemical accelerators used for this purpose include water-soluble oxidizing agents such as nitrates, chlorates or chromates or organic accelerators such as N-containing compounds, specifically Aniline or pyridine or aromatic carboxylic acids.
  • the phosphating mentioned takes place batchwise or continuously, in baths or spray systems at room temperatures or above.
  • the drying of the Phosphating layer which can be a few tens of ⁇ m, becomes the same subjected to a subsequent surface rinsing according to the invention; this usually happens at room temperature.
  • Aqueous solutions or slurries of reducing and / or passivating compounds especially of nitrites or hydrazine or hydrazine derivatives or hydroxylamine or hydroxylamine derivatives and of chromates.
  • the phosphated and rinsed metal surface is then washed non-aqueous or aqueous metal or non-metal sols and impregnated with a concrete admixture.
  • Shotcrete samples which were treated according to the invention
  • Reinforcing fibers made of steel were reinforced, showed about 4% higher tensile strength compared to normal armored comparative samples; when the samples were sharpened up even after 6 months of outdoor storage, no corrosion on the Steel fibers.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Description

Die hier befasste Erfindung betrifft ein Verfahren zur gleichzeitigen Korrosionsinhibierung und Verbesserung der Verbundeigenschaften von Armierungsmetallen für Beton sowie die Verwendung von derart behandelten Armierungsmetallen.
D1, d.h. die US-A 2 992 131, beschreibt ein Verfahren zur gleichzeitigen Korrosionsinhibierung und Verbesserung der Verbundeigenschaften von Armierungsmetallen (Eisen-Metall) für Beton durch eine Fe-, Zn- oder Mn-Phosphatierung (siehe Ansprüche 1 und 3; Spalte 3, Zeilen 5 - 22). Nach D1 kann das phosphatierte Metall nachbehandelt werden mit Zusammensetzungen, die Chromate und/oder Glyoxal (ein bekannter Korrosionsinhibitor) - siehe Ansprüche 3 und 5 - enthalten.
Gemäss einer der in D2, d.h. in der EP-A 0 285 593, angegebenen Lehren (Spalte 4, Zeilen 42 bis und mit 52) wird ein Armierungseisen vorerst phosphatiert. Anschliessend wird auf der derart vorbehandelten Metall-Oberfläche eine Oelschicht aufgebracht, welche nach einer gewissen Zeit austrocknet.
D3, d.h. die EP-A 0 095 413, schliesslich beansprucht eine Wickel-Hülle für ein Vorspann-Drahtseil in vorgespannten Beton-Werkstücken.
Die Innenseite der genannten Hülle wird vorerst phosphatiert und anschliessend mit einer Seife, bestehend aus einer wässerigen Lösung von Na-Stearat und -Palmitat, besprüht.
Das erfindungsgemässe Verfahren zur gleichzeitigen Korrosionsinhibierung und Verbesserung der Verbundeigenschaften von Armierungsmetallen für Beton ist demgegenüber in den weiter unten folgenden Patentansprüchen gekennzeichnet.
Der erfindungsgemässe Phosphatierungs-Schritt wird in an sich bekannten Metallphosphatbädern, v.a. in Fe-, Zn-, Zn/Ca- oder Mn-Phosphatbädern ausgeführt. Hierzu eingesetzte chemische Beschleuniger umfassen wasserlösliche Oxydationsmittel wie Nitrate, Chlorate oder Chromate bzw. organische Beschleuniger wie N-haltige Verbindungen, speziell Anilin oder Pyridin oder aromatische Carbonsäuren.
Die genannte Phosphatierung geschieht batchweise oder kontinuierlich, in Bädern oder Spritzanlagen bei Raumtemperaturen oder darüber.
Nach der üblicherweise mittels Heissluft ausgeführten Austrocknung der Phosphatierungsschicht, die einige 10 um betragen kann, wird dieselbe erfindungsgemäss einer anschliessenden Oberflächenspülung unterworfen; diese geschieht normalerweise bei Raumtemperatur.
Verwendet werden hierzu wässerige Lösungen bzw. Aufschlämmungen von reduzierenden und/oder passivierenden Verbindungen, v.a. von Nitriten oder Hydrazin bzw. Hydrazinderivaten oder Hydroxylamin bzw. Hydroxylaminderivaten und von Chromaten.
Anschliessend wird die phosphatierte und gespülte Metalloberfläche mit nichtwässerigen oder wässerigen Metall- oder Nichtmetallsolen und einem Beton-Zusatzmittel imprägniert.
Es wurde festgestellt, dass erfindungsgemäss behandelte Armierungsmetalle schon während des Lagerns - auch im Freien - ein deutlich geringeres Korrosionsbild ergeben als nicht behandelte Proben.
Spritzbeton-Proben, welche mit erfindungsgemäss behandelten Armierungsfasern aus Stahl (Länge 2 bzw. 4 cm) verstärkt waren, zeigten eine um etwa 4 % höhere Zugfestigkeit verglichen mit normal armierten Vergleichsproben; beim Aufspitzen der Proben zeigten sich auch nach 6-monatiger Aussenlagerung keine Korrosionsansätze an den Stahlfasern.

Claims (4)

  1. Verfahren zur gleichzeitigen Korrosionsinhibierung und Verbesserung der Verbundeigenschaften von Armierungsmetallen für Beton, dadurch gekennzeichnet, dass nach einer Oberflächenbehandlung der Metallteile mittels einer Fe-, Ca/Zn-, Zn- oder Mn-Phosphatierung die phosphatierte Metalloberfläche anschliessend mittels einer wässerigen Lösung oder Aufschlämmung von reduzierenden und/oder passivierenden Verbindungen gespült und dann mit nichtwässerigen oder wässerigen Metall- oder Nichtmetallsolen und einem Beton-Zusatzmittel imprägniert wird.
  2. Verfahren gemäss Patentanspruch 1, weiter dadurch gekennzeichnet, dass die wässerige Lösung oder Aufschlämmung Nitrite oder Hydrazin enthält.
  3. Anwendung des Verfahrens gemäss dem Patentanspruch 1 oder 2 an Stangen, Platten, Nägeln, Drähten, Stiften, Stützpfeilern, Fasern oder andersgeformten Metall-Teilen, deren Oberflächen aus Eisen bzw. Eisenlegierungen, Zink oder Zinklegierungen und/oder anderen phosphatierbaren Metallen bestehen.
  4. Verwendung der gemäss Patentanspruch 1 erhaltenen Armierungsmetalle in Beton-Trag- oder -Stütz-Elementen sowie Industrieböden und Decken-Elementen und in Form von Metallfasern in Spritzbeton, wobei die Verbesserung des Verbundes zwischen Armierung und Beton auch zu einer Erhöhung der mechanischen Festigkeiten der Gesamtteile führt.
EP96904249A 1995-04-13 1996-03-19 Korrosionsinhibierung und verbesserung der verbundeigenschaften von armierungsmetallen Expired - Lifetime EP0755462B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH01080/95A CH689307A5 (de) 1995-04-13 1995-04-13 Verfahren sowohl zur Korrosionsinhibierung, wie auch zur Verstärkung der Verbundeigenschaften von Armierungsmetallen.
CH1080/95 1995-04-13
CH108095 1995-04-13
PCT/IB1996/000244 WO1996032522A1 (de) 1995-04-13 1996-03-19 Korrosionsinhibierung und verbesserung der verbundeigenschaften von armierungsmetallen

Publications (2)

Publication Number Publication Date
EP0755462A1 EP0755462A1 (de) 1997-01-29
EP0755462B1 true EP0755462B1 (de) 1999-08-18

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Application Number Title Priority Date Filing Date
EP96904249A Expired - Lifetime EP0755462B1 (de) 1995-04-13 1996-03-19 Korrosionsinhibierung und verbesserung der verbundeigenschaften von armierungsmetallen

Country Status (7)

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EP (1) EP0755462B1 (de)
JP (1) JPH10501849A (de)
AT (1) ATE183553T1 (de)
CH (1) CH689307A5 (de)
DE (1) DE59602778D1 (de)
DK (1) DK0755462T3 (de)
WO (1) WO1996032522A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100245851B1 (ko) * 1997-01-16 2000-03-02 한규택 강관 및 철근용 접착성 방청도료 접착공법
JP2001271184A (ja) * 2000-03-24 2001-10-02 Nisshin Kako Kk ステンレス鋼の防食処理剤および防食処理方法
WO2011076273A1 (en) * 2009-12-23 2011-06-30 Vsl International Ag Improved strand and method of producing the same
JP5312526B2 (ja) * 2011-06-13 2013-10-09 株式会社ピーエス三菱 Ｐｃ緊張材の腐食抑制方法
CN103161182A (zh) * 2011-12-09 2013-06-19 彭道儒 混凝土钢筋磷化缓蚀法防腐新工艺
CN104962935A (zh) * 2015-06-13 2015-10-07 周彩球 一种铜合金酸洗钝化剂

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2992131A (en) * 1957-03-21 1961-07-11 Jenolite Ltd Treatment of metal surfaces
FR2527246A1 (fr) * 1982-05-21 1983-11-25 Freyssinet Int Stup Perfectionnements aux gaines de precontrainte et a leurs procedes de fabrication
BE1000432A6 (fr) * 1987-04-03 1988-12-06 Centre Rech Metallurgique Procede pour ameliorer la resistance a la corrosion d'une barre d'armature en acier trempe et auto-revenu.

Also Published As

Publication number Publication date
CH689307A5 (de) 1999-02-15
ATE183553T1 (de) 1999-09-15
DE59602778D1 (de) 1999-09-23
DK0755462T3 (da) 2000-03-13
EP0755462A1 (de) 1997-01-29
JPH10501849A (ja) 1998-02-17
WO1996032522A1 (de) 1996-10-17

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