EP0575926A1 - Aluminium-Überzug für Metallteile - Google Patents

Aluminium-Überzug für Metallteile Download PDF

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Publication number
EP0575926A1
EP0575926A1 EP93109844A EP93109844A EP0575926A1 EP 0575926 A1 EP0575926 A1 EP 0575926A1 EP 93109844 A EP93109844 A EP 93109844A EP 93109844 A EP93109844 A EP 93109844A EP 0575926 A1 EP0575926 A1 EP 0575926A1
Authority
EP
European Patent Office
Prior art keywords
weight
coating
impurities
bath
metallic products
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.)
Withdrawn
Application number
EP93109844A
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English (en)
French (fr)
Inventor
Claudio Campolucci
Ferdinando Colaiacovo
Maria Pia Sforza
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.)
Centro Sviluppo Materiali SpA
Original Assignee
Centro Sviluppo Materiali SpA
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 Centro Sviluppo Materiali SpA filed Critical Centro Sviluppo Materiali SpA
Publication of EP0575926A1 publication Critical patent/EP0575926A1/de
Withdrawn legal-status Critical Current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
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon

Definitions

  • the present invention relates to an aluminiumbased coating for metallic products and in particular metal sheet.
  • Aluminiumbased coatings for metallic products are employed to protect said products from corrosion.
  • aluminised metal sheet it is widely used in applications which call for exposure to high temperatures and, in the automotive industry, for the manufacture of tubing and silencers for exhaust gases.
  • the entire exhaust system thus operates under more severe temperature conditions and with more corrosive condensation.
  • Another object of the present invention is the coating obtainable with said aluminising bath.
  • Still another object of the present invention is the aluminising process.
  • the aluminising bath according to the present invention comprising in a known manner Si up to 10% by weight and Fe up to 1% by weight, is characterised by a manganese content ranging between 0.5% and 2% by weight and the rest being Al and minor impurities up to 100% by weight.
  • the aluminising bath in accordance with the present invention contains:
  • the metallic products to be treated are in general in the form of continuous elongated bodies like for example metal sheet in strip form.
  • the strip which can consist of crude steel from cold rolling, pickled hot rolled, cold annealed rolled steel, after conventional surface preparation (e.g. chemical degreasing, electrochemical degreasing, rinsing and drying) is continuously heat treated in order to bobtain the metallurgical properties required for the final product in a reducing atmosphere (N2+H2) for reduction of the oxides.
  • the strip is brought to the temperature of the aluminising bath, then immersed therein.
  • the temperature of the bath is usually between 620°C and 660°c and the immersion times vary typically between 1 and 6 seconds.
  • the coating in excess, still in liquid state, is removed by air blades and then air cooled to T ⁇ 300°C and then water cooled (the final temperature of the strip is ⁇ 40°C), then wrung and, if required, skinpassed and passivated.
  • compositions of the coatings obtained are typically:
  • Coatings thus obtained have generally a thickness between 10 ⁇ and 30 ⁇ . They are highly homogeneous and bright and give excellent results when tested for adherence, acid corrosion and hot oxidation at 800°C.
  • Fig. 1 illustrates a specimen prepared according to the invention and subjected to impact test. It did not display any exfoliation or detachment of the coating.
  • Fig. 2 illustrates the behaviour with respect to the weight increse of the new aluminised material, subjected to hot oxidation test according to the examples.
  • Fig. 3 illustrates the results obtained at the end of ten cycles (200 immersions) in synthetic condensate vapours according to the examples and after removal of the corrosion products.
  • Fig. 4A and Fig. 4B illustrate the metallographic crosssection of the aluminum coating with an Electron Scanning Microscope before and after hot oxidation.
  • Fig. 4A shows the metalographic crossection of the specimen as is, there can be observed a homogeneous coating with formation of a homogeneous and continuous interphase.
  • Fig. 4B shows the metallographic crosssection performed on the material subjected to hot oxidation, there can be observed a controlled growth of the grain and absence of oxidation zones at the interphase.
  • All coatings had a thickness of approximately 22 ⁇ .
  • Specimens 3cm x 7cm approximately were weighed after cleaning and then placed in a muffle at a temperature of 800°C for 48 hours at the end of which the weight was again noted.
  • This cycle was repeated five times for a total of 240 hours of heating.
  • the approximately 3cm x 7cm specimens were cleaned, weighed and then subjected to the wet corrosion resistance test.
  • the coated steel samples were analysed with an Optical Microscope (M.09 and with an Electron Scanning Microscope (SEM-EPMA) before and after hot oxidation.
  • M.09 Optical Microscope
  • SEM-EPMA Electron Scanning Microscope
  • FIG. 4B The metallographic crosssection performed on the material subjected to hot oxidation shows a controlled growth of the grain and absence of oxidation zones at the interphase.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)
EP93109844A 1992-06-23 1993-06-21 Aluminium-Überzug für Metallteile Withdrawn EP0575926A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM920477A IT1254402B (it) 1992-06-23 1992-06-23 Rivestimento a base di alluminio per manufatti metallici.
ITRM920477 1992-06-23

Publications (1)

Publication Number Publication Date
EP0575926A1 true EP0575926A1 (de) 1993-12-29

Family

ID=11401077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93109844A Withdrawn EP0575926A1 (de) 1992-06-23 1993-06-21 Aluminium-Überzug für Metallteile

Country Status (2)

Country Link
EP (1) EP0575926A1 (de)
IT (1) IT1254402B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0743373A1 (de) * 1995-05-18 1996-11-20 Nippon Steel Corporation Aluminiumbeschichtete Stahlplatte durch Feuertauchbadtauchen mit sehr gute Korrosions- und Wärmebestandigkeit und Verfahren zu ihrer Herstellung
WO2017137304A1 (de) * 2016-02-08 2017-08-17 Salzgitter Flachstahl Gmbh Aluminiumbasierte beschichtung für stahlbleche oder stahlbänder und verfahren zur herstellung hierzu
US10287440B2 (en) 2014-07-16 2019-05-14 Thyssenkrupp Steel Europe Ag Steel product with an anticorrosive coating of aluminum alloy and method for the production thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3639107A (en) * 1969-07-22 1972-02-01 Aluminum Co Of America Hot-dip-aluminizing alloy
FR2200373A1 (de) * 1972-09-20 1974-04-19 Uss Eng & Consult
JPH04259363A (ja) * 1991-02-13 1992-09-14 Nippon Steel Corp 耐食性の優れた溶融アルミメツキ鋼板

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3639107A (en) * 1969-07-22 1972-02-01 Aluminum Co Of America Hot-dip-aluminizing alloy
FR2200373A1 (de) * 1972-09-20 1974-04-19 Uss Eng & Consult
JPH04259363A (ja) * 1991-02-13 1992-09-14 Nippon Steel Corp 耐食性の優れた溶融アルミメツキ鋼板

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 046 (C-1021)28 January 1993 & JP-A-04 259363 ( NIPPON STEEL CORP ) 14 September 1992 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0743373A1 (de) * 1995-05-18 1996-11-20 Nippon Steel Corporation Aluminiumbeschichtete Stahlplatte durch Feuertauchbadtauchen mit sehr gute Korrosions- und Wärmebestandigkeit und Verfahren zu ihrer Herstellung
US5789089A (en) * 1995-05-18 1998-08-04 Nippon Steel Corporation Hot-dipped aluminum coated steel sheet having excellent corrosion resistance and heat resistance, and production method thereof
US10287440B2 (en) 2014-07-16 2019-05-14 Thyssenkrupp Steel Europe Ag Steel product with an anticorrosive coating of aluminum alloy and method for the production thereof
WO2017137304A1 (de) * 2016-02-08 2017-08-17 Salzgitter Flachstahl Gmbh Aluminiumbasierte beschichtung für stahlbleche oder stahlbänder und verfahren zur herstellung hierzu
RU2704340C1 (ru) * 2016-02-08 2019-10-28 Зальцгиттер Флахшталь Гмбх Способ изготовления закаленных под прессом деталей из стальных листов или стальных лент с покрытием на основе алюминия и закаленная под прессом деталь из них
US10876195B2 (en) 2016-02-08 2020-12-29 Salzgitter Flachstahl Gmbh Method for producing press-hardened components consisting of steel sheets or steel strips comprising an aluminium-based coating, and pressed-hardened component therefrom

Also Published As

Publication number Publication date
ITRM920477A1 (it) 1993-12-23
ITRM920477A0 (it) 1992-06-23
IT1254402B (it) 1995-09-14

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