EP0285593A1 - Verfahren zur Erhöhung des Korrosionswiderstandes eines gehärteten und selbstangelassenen Armierungsstahlstabes - Google Patents

Verfahren zur Erhöhung des Korrosionswiderstandes eines gehärteten und selbstangelassenen Armierungsstahlstabes Download PDF

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Publication number
EP0285593A1
EP0285593A1 EP88870053A EP88870053A EP0285593A1 EP 0285593 A1 EP0285593 A1 EP 0285593A1 EP 88870053 A EP88870053 A EP 88870053A EP 88870053 A EP88870053 A EP 88870053A EP 0285593 A1 EP0285593 A1 EP 0285593A1
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EP
European Patent Office
Prior art keywords
bar
layer
self
during
deposited
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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.)
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Application number
EP88870053A
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English (en)
French (fr)
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EP0285593B1 (de
Inventor
Jacques Defourny
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.)
Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Priority to AT88870053T priority Critical patent/ATE63957T1/de
Publication of EP0285593A1 publication Critical patent/EP0285593A1/de
Application granted granted Critical
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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
    • 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
    • C23C22/73—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 characterised by the process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • 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

Definitions

  • a first type of technique consists in applying a protective film to the concrete intended to prevent the penetration and diffusion of atmospheric agents in the concrete.
  • This film applied to the finished part or construction, however, does not provide any protection for the reinforcement during its storage, transport or use.
  • its protective action may diminish or even disappear over time under the effect of atmospheric erosion. Finally, this action is compromised in the event of degradation or damage to the protective film.
  • the surface of the bar is at a temperature below the point Ms of the steel used, while the core of the bar is not reached by the sudden cooling.
  • the bar is then, during a second step, subjected to cooling in the air during which the temperatures are equalized in its section: the surface temperature increases under the effect of the heat coming from the heart, this which causes self-tempering of the surface layer of martensite or bainite; simultaneously, the core cools slowly and its initial austenitic structure is transformed into ferrite and carbides.
  • surface and core temperatures are approximately equal to between 400 degrees centigrade and 700 degrees centigrade. From the equalization of the temperatures, the bar cools, throughout its section, to room temperature, without undergoing any further structural transformation. This latter cooling constitutes the third stage of this known process.
  • the present invention makes it possible to take advantage of the particular conditions which this process presents to achieve the aim aimed at, namely the improvement of the corrosion resistance of this type of concrete reinforcement.
  • the invention also relates to a rebar having improved protection against corrosion obtained by applying this method.
  • the bar is subjected to a phosphating treatment during at least one of the stages of said process.
  • said phosphating treatment is applied during the first step of the process, by adding the phosphating agent to the cooling water.
  • said phosphating treatment is applied during the second step of the process, by spraying onto the surface of the bar a liquid or gaseous fluid containing said phosphating agent.
  • a stable oxide layer is formed on the bar, by exposing said bar to an oxidizing gas stream such as air or oxygen.
  • this operation is advantageously carried out in the process zones where the surface of the bar has a high temperature, that is to say before the start of the first step and / or between the second and the third step, in the sense defined above.
  • this layer of paint is advantageously deposited by spraying, this deposit preferably being carried out between the first and the second stage of the process, that is to say in the zone thereof where the surface of the bar is at a low temperature.
  • the paint is then quickly annealed and dried at high temperature during the surface reheating of the bar which occurs during the second stage of the process.
  • a thin film of plastic resin is deposited on the bar, for example of the type soluble in water and used in other applications as additives to concrete to make it impermeable to moisture.
  • this resin film is advantageously deposited by projection or immersion during the third step in the sense defined above.
  • an oil film is deposited on said protective layer consisting in particular of phosphate, oxide, paint or resin.
  • a desiccant oil is preferably used.
  • a desiccant oil remains fluid and oily for a period which depends on its composition; it thus very effectively protects said layer against any external agent and it thus clearly reinforces the protection provided by the phosphate, oxide, paint or resin layer.
  • the oil dries and therefore does not alter the behavior, in particular, the adhesion of the bar in concrete.
  • an operating sequence corresponding to a pickling treatment followed by a manganese phosphating is described below, applied to a bar during the third step of the quenching and self-tempering process.
  • the bar was immersed for about 10 min in a pickling solution consisting of 0.5 N HCl supplemented with 2.5 g / l of hexamethylenetetramine, which was at room temperature.
  • a pickling solution consisting of 0.5 N HCl supplemented with 2.5 g / l of hexamethylenetetramine, which was at room temperature.
  • the bar was immersed in an aqueous solution containing 10% by weight of a phosphating agent, the temperature of the solution was between 90 ° C and 95 ° C, the ratio of total acidity to free acidity was 7: 1 and the immersion time was approximately 10 min.
  • the bar phosphated was coated with an oil film by soaking in an oil bath at room temperature.
  • the bar thus treated showed no trace of oxidation during prolonged storage and exposure to an industrial atmosphere.
  • the method of the invention is implemented during the quenching and self-tempering process. It does not require significant additional equipment and it provides both temporary protection against atmospheric corrosion and permanent protection against corrosion in concrete. Finally, it would not be departing from the scope of the present invention to apply simultaneously or successively several of the abovementioned variants, during the quenching and self-tempering process of the bar.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural 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)
  • Reinforcement Elements For Buildings (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Heat Treatment Of Steel (AREA)
EP88870053A 1987-04-03 1988-03-29 Verfahren zur Erhöhung des Korrosionswiderstandes eines gehärteten und selbstangelassenen Armierungsstahlstabes Expired - Lifetime EP0285593B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88870053T ATE63957T1 (de) 1987-04-03 1988-03-29 Verfahren zur erhoehung des korrosionswiderstandes eines gehaerteten und selbstangelassenen armierungsstahlstabes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8700353 1987-04-03
BE8700353A BE1000432A6 (fr) 1987-04-03 1987-04-03 Procede pour ameliorer la resistance a la corrosion d'une barre d'armature en acier trempe et auto-revenu.

Publications (2)

Publication Number Publication Date
EP0285593A1 true EP0285593A1 (de) 1988-10-05
EP0285593B1 EP0285593B1 (de) 1991-05-29

Family

ID=3882602

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88870053A Expired - Lifetime EP0285593B1 (de) 1987-04-03 1988-03-29 Verfahren zur Erhöhung des Korrosionswiderstandes eines gehärteten und selbstangelassenen Armierungsstahlstabes

Country Status (5)

Country Link
EP (1) EP0285593B1 (de)
AT (1) ATE63957T1 (de)
BE (1) BE1000432A6 (de)
DE (1) DE3862982D1 (de)
ES (1) ES2023510B3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659356A1 (fr) * 1990-03-07 1991-09-13 Liesse Maurice Procede de protection de surface par voie chimique d'objets metalliques.
US5554872A (en) * 1991-05-13 1996-09-10 Kabushiki Kaisha Toshiba Semiconductor device and method of increasing device breakdown voltage of semiconductor device
WO1996032522A1 (de) * 1995-04-13 1996-10-17 Holderchem Holding Ag Korrosionsinhibierung und verbesserung der verbundeigenschaften von armierungsmetallen
WO2003091480A1 (fr) * 2002-04-26 2003-11-06 Liuzhou Construction Machinery Factory General Barre en acier precontraint resistant a la corrosion et procede de production correspondant
EP3040495A1 (de) * 2014-05-23 2016-07-06 Andrew Fry Fussbodenestrichverstärkung, verfahren zur verwendung solch einer verstärkung zur herstellung von fussbodenestrich

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE737025C (de) * 1939-06-21 1943-07-05 Metallgesellschaft Ag Abschreckmittel fuer erhitzte Metalle
DE889575C (de) * 1951-06-26 1953-09-10 Dynamit Nobel Ag Schlagwettersichere elektrische Zuendpillen
DE1153589B (de) * 1957-03-21 1963-08-29 Jenolite Ltd Verfahren zur Behandlung der Oberflaeche von Gegenstaenden aus Eisenmetallen, die in Beton eingebettet werden
FR2450921A1 (fr) * 1979-02-23 1980-10-03 Sumitomo Metal Ind Materiau a base d'acier non magnetique pourvu d'un revetement superficiel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE737025C (de) * 1939-06-21 1943-07-05 Metallgesellschaft Ag Abschreckmittel fuer erhitzte Metalle
DE889575C (de) * 1951-06-26 1953-09-10 Dynamit Nobel Ag Schlagwettersichere elektrische Zuendpillen
DE1153589B (de) * 1957-03-21 1963-08-29 Jenolite Ltd Verfahren zur Behandlung der Oberflaeche von Gegenstaenden aus Eisenmetallen, die in Beton eingebettet werden
FR2450921A1 (fr) * 1979-02-23 1980-10-03 Sumitomo Metal Ind Materiau a base d'acier non magnetique pourvu d'un revetement superficiel

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 104, no. 2, janvier 1986, page 259, résumé no. 9793j, Columbus, Ohio, US; & JP-A-60 110 381 (SUMITOMO ELECTRIC INDUSTRIES LTD) 15-06-1985 *
CHEMICAL ABSTRACTS, vol. 90, no. 16, avril 1979, page 230, résumé no. 125340a, Columbus, Ohio, US; V.S. VANIN et al.: "Nonisothermal phosphating and oxidizing of steel", & ZASHCH. MET. 1979, 15(1), 110-12 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659356A1 (fr) * 1990-03-07 1991-09-13 Liesse Maurice Procede de protection de surface par voie chimique d'objets metalliques.
US5554872A (en) * 1991-05-13 1996-09-10 Kabushiki Kaisha Toshiba Semiconductor device and method of increasing device breakdown voltage of semiconductor device
WO1996032522A1 (de) * 1995-04-13 1996-10-17 Holderchem Holding Ag Korrosionsinhibierung und verbesserung der verbundeigenschaften von armierungsmetallen
WO2003091480A1 (fr) * 2002-04-26 2003-11-06 Liuzhou Construction Machinery Factory General Barre en acier precontraint resistant a la corrosion et procede de production correspondant
EP3040495A1 (de) * 2014-05-23 2016-07-06 Andrew Fry Fussbodenestrichverstärkung, verfahren zur verwendung solch einer verstärkung zur herstellung von fussbodenestrich

Also Published As

Publication number Publication date
ATE63957T1 (de) 1991-06-15
BE1000432A6 (fr) 1988-12-06
ES2023510B3 (es) 1992-01-16
EP0285593B1 (de) 1991-05-29
DE3862982D1 (de) 1991-07-04

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