WO2011059341A1 - Procédé pour la production de matière en bande ou feuille continue d'aluminium contenant du magnésium présentant une adhérence améliorée - Google Patents

Procédé pour la production de matière en bande ou feuille continue d'aluminium contenant du magnésium présentant une adhérence améliorée Download PDF

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Publication number
WO2011059341A1
WO2011059341A1 PCT/NO2010/000410 NO2010000410W WO2011059341A1 WO 2011059341 A1 WO2011059341 A1 WO 2011059341A1 NO 2010000410 W NO2010000410 W NO 2010000410W WO 2011059341 A1 WO2011059341 A1 WO 2011059341A1
Authority
WO
WIPO (PCT)
Prior art keywords
aluminium
web
process according
degreasing
magnesium
Prior art date
Application number
PCT/NO2010/000410
Other languages
English (en)
Inventor
Merete Hallenstvet
Original Assignee
Norsk Hydro Asa
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 Norsk Hydro Asa filed Critical Norsk Hydro Asa
Priority to EP10830248.0A priority Critical patent/EP2499272B1/fr
Priority to NO10830248A priority patent/NO2499272T3/no
Publication of WO2011059341A1 publication Critical patent/WO2011059341A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
    • C25F1/02—Pickling; Descaling
    • C25F1/04—Pickling; Descaling in solution
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/024—Anodisation under pulsed or modulated current or potential
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
    • C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids

Definitions

  • the present invention relates to a process for the production of magnesium containing aluminium alloys, in particular magnesium containing rolled aluminium strip or web material.
  • the surface of rolled aluminium strip has excess rolling lubricants and therefore needs to be thoroughly cleaned to provide sufficient adhesion for different types of adhesives or coatings needed to withstand specified use under different and often aggressive environmental conditions.
  • Multi Layer Tube/pipe A standard design of these products comprises an inner tube of a poly ethylene (PE / PEX) or other polymer and where tie resin or adhesive is provided on the polymer tube.
  • PE / PEX poly ethylene
  • An aluminium tube is roll formed around the inner polymer tube and welded. The adhesive secures the roll formed aluminium tube to the polymer tube.
  • the aluminium tube is in turn provided with a new layer of tie resin or adhesive prior to the extrusion of the outer polymer (PE or PEX and others)
  • degreased material The standard process steps related to the production of aluminium sheet materials are by rolling and annealing thereafter chemical degreasing prior to subsequent coating with a lacquer or other organic or inorganic coating.
  • magnesium oxide on the surface of aluminium in MLT and other applications give bad adhesion for the adhesive on the aluminium surface.
  • the magnesium oxide when exposed to moisture, the magnesium oxide is converted to magnesium hydroxide which is a mild alkali and which can attack the metal underneath a coating, resulting in the loss of adhesion.
  • Magnesium containing aluminium alloys in particular magnesium containing rolled aluminium strip or web material forming basis for the process according to the invention have high strenght and at the same time give excellent forming properties.
  • the skilled person would have to choose higher alloyed aluminium if he wants to down gauge the metal and maintain the strength of the product.
  • the process according to the invention is based on production of magnesium containing aluminium alloy sheet material of the above kind including the following steps: I. Rolling to final thickness of the aluminium web
  • electrochemical degreasing including following rinsing and drying.
  • the electrochemical degreasing is done by alternating current (AC) in hot sulphuric acid resulting in a very thin aluminium oxide on the surface, typical 10 - 30nm.
  • AC alternating current
  • aluminium oxide is built at the aluminium - aluminium oxide interface.
  • the aluminium web is generating hydrogen gas on the surface and debris and lubricants are flushed off and at the same time the aluminium oxide on the surface is chemically dissolved in the hot sulphuric acid.
  • Thin oxide layer is obtained by using sulphuric acid at a concentration of 150 +/- 50 g /litre, current density of preferably 300 - 430 A/m 2 , with a contact time of 1 - 10 seconds, prefrablyl .5 - 3.5 seconds and at a temperature of 60 - 90 °C, preferably 75 - 85 °C.
  • This oxide is thick enough to stop magnesium from migrating to the surface during soft annealing, but will in stead concentrate at the interface between aluminium oxide layer and aluminium metal.
  • the hereby degreased material give excellent adhesion since there is no magnesium oxide on the surface
  • Tests were performed with aluminium 3005 alloy sheet substrates with typically 0,5% Mg, comparing chemical degreasing with electrochemical degreasing according to the present invention prior to annealing.
  • the chemical degreasing was accomplished by dipping the specimen of the sheet substrate in acid degreasing bath of sulphuric acid and hydrofluoric acid with addition of surfactants.
  • electrochemical degreasing according to the invention was done by production equipment with the following parameters, current density 346 A/m2, contact time 6,4 seconds and 150g/ litre sulphuric acid with a temperature of 80°C.
  • the surface of electrochemical degreased AA3005 is aluminium oxide (Oxygen peaks at the surface) and the magnesium peak is at the interface between the aluminium oxide and the aluminium metal.
  • the surface of the chemically degreased material has magnesium oxide on the outer surface seen by the magnesium peak at the outermost surface.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

L'invention porte sur un procédé pour la production d'alliages d'aluminium contenant du magnésium, en particulier d'une matière en bande ou feuille d'aluminium laminé contenant du magnésium. Le procédé est caractérisé par les étapes suivantes : E. le laminage à une épaisseur finale de la feuille continue d'aluminium, F. le planage de la feuille continue d'aluminium, G. le dégraissage électrochimique de la feuille continue d'aluminium, H. le recuit d'adoucissement de la feuille continue d'aluminium. Le dégraissage électrochimique est effectué par un traitement par courant alternatif (AC) de la matière en feuille d'aluminium dans de l'acide sulfurique chaud, ce qui conduit à une couche mince d'oxyde d'aluminium sur la surface ayant une épaisseur comprise entre 10 et 20 nm. La matière dégraissée de cette manière donne une excellente adhérence dans la mesure où il n'y a pas d'oxyde de magnésium sur la surface.
PCT/NO2010/000410 2009-11-13 2010-11-11 Procédé pour la production de matière en bande ou feuille continue d'aluminium contenant du magnésium présentant une adhérence améliorée WO2011059341A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10830248.0A EP2499272B1 (fr) 2009-11-13 2010-11-11 Procédé pour la production de matière en bande ou feuille continue d'aluminium contenant du magnésium présentant une adhérence améliorée
NO10830248A NO2499272T3 (fr) 2009-11-13 2010-11-11

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20093346 2009-11-13
NO20093346 2009-11-13

Publications (1)

Publication Number Publication Date
WO2011059341A1 true WO2011059341A1 (fr) 2011-05-19

Family

ID=43991814

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2010/000410 WO2011059341A1 (fr) 2009-11-13 2010-11-11 Procédé pour la production de matière en bande ou feuille continue d'aluminium contenant du magnésium présentant une adhérence améliorée

Country Status (3)

Country Link
EP (1) EP2499272B1 (fr)
NO (1) NO2499272T3 (fr)
WO (1) WO2011059341A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018108529A1 (fr) * 2016-12-12 2018-06-21 Norsk Hydro Asa Produit composite

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1235661A (en) * 1967-03-30 1971-06-16 Alcan Res & Dev Production of lacquered aluminium or aluminium alloy strip or sheet
US3718547A (en) * 1970-11-16 1973-02-27 Alcan Res & Dev Continuous electrolytic treatment for cleaning and conditioning aluminum surfaces
GB1539341A (en) * 1976-03-09 1979-01-31 Nordisk Aluminium As Process and apparatus for pre-treating aluminium or aluminium alloy ribbons prior to lacquering
US5997721A (en) * 1994-12-19 1999-12-07 Alcan International Limited Cleaning aluminum workpieces
EP1641005A1 (fr) * 2003-06-03 2006-03-29 Showa Denko K.K. Procede pour produire un materiau d'aluminium destine a une electrode de condensateur electrolytique, materiau d'aluminium destine a une electrode de condensateur electrolytique, procede pour produire un materiau d'electrode destine a un condensateur electrolytique, et condensateur electrolytique a
US20080035488A1 (en) * 2006-03-31 2008-02-14 Martin Juan Francisco D R Manufacturing process to produce litho sheet
WO2008058708A1 (fr) * 2006-11-14 2008-05-22 Aleris Aluminum Duffel Bvba Alliage d'aluminium résistant au fluage pour tubes multicouches

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1235661A (en) * 1967-03-30 1971-06-16 Alcan Res & Dev Production of lacquered aluminium or aluminium alloy strip or sheet
US3718547A (en) * 1970-11-16 1973-02-27 Alcan Res & Dev Continuous electrolytic treatment for cleaning and conditioning aluminum surfaces
GB1539341A (en) * 1976-03-09 1979-01-31 Nordisk Aluminium As Process and apparatus for pre-treating aluminium or aluminium alloy ribbons prior to lacquering
US5997721A (en) * 1994-12-19 1999-12-07 Alcan International Limited Cleaning aluminum workpieces
EP1641005A1 (fr) * 2003-06-03 2006-03-29 Showa Denko K.K. Procede pour produire un materiau d'aluminium destine a une electrode de condensateur electrolytique, materiau d'aluminium destine a une electrode de condensateur electrolytique, procede pour produire un materiau d'electrode destine a un condensateur electrolytique, et condensateur electrolytique a
US20080035488A1 (en) * 2006-03-31 2008-02-14 Martin Juan Francisco D R Manufacturing process to produce litho sheet
WO2008058708A1 (fr) * 2006-11-14 2008-05-22 Aleris Aluminum Duffel Bvba Alliage d'aluminium résistant au fluage pour tubes multicouches

Also Published As

Publication number Publication date
EP2499272B1 (fr) 2017-08-16
EP2499272A4 (fr) 2016-03-23
NO2499272T3 (fr) 2018-01-13
EP2499272A1 (fr) 2012-09-19

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