EP0318403A1 - Verfahren zur kontinuierlichen anodischen Oxidation von Bändern aus Aluminium oder Aluminiumlegierungen, die mit organischen Produkten überzogen werden sollen - Google Patents

Verfahren zur kontinuierlichen anodischen Oxidation von Bändern aus Aluminium oder Aluminiumlegierungen, die mit organischen Produkten überzogen werden sollen Download PDF

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Publication number
EP0318403A1
EP0318403A1 EP88420391A EP88420391A EP0318403A1 EP 0318403 A1 EP0318403 A1 EP 0318403A1 EP 88420391 A EP88420391 A EP 88420391A EP 88420391 A EP88420391 A EP 88420391A EP 0318403 A1 EP0318403 A1 EP 0318403A1
Authority
EP
European Patent Office
Prior art keywords
strips
anodization
electrolyte
aluminium
anodising
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.)
Granted
Application number
EP88420391A
Other languages
English (en)
French (fr)
Other versions
EP0318403B1 (de
Inventor
René Layre
Monique Kucza
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.)
Constellium Issoire SAS
Original Assignee
Cegedur Societe de Transformation de lAluminium Pechiney SA
Pechiney Rhenalu SAS
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 Cegedur Societe de Transformation de lAluminium Pechiney SA, Pechiney Rhenalu SAS filed Critical Cegedur Societe de Transformation de lAluminium Pechiney SA
Priority to AT88420391T priority Critical patent/ATE83511T1/de
Publication of EP0318403A1 publication Critical patent/EP0318403A1/de
Application granted granted Critical
Publication of EP0318403B1 publication Critical patent/EP0318403B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a process for the continuous anodization of strips of aluminum or one of its alloys intended to be coated with an organic product.
  • one of the means consists in coating the surfaces of said elements with organic products such as glues in order to make them integral with one another.
  • 4,085,012 claims an anodization process in which an aqueous solution of phosphoric acid with a weight concentration of between 3 and 20% is used at a temperature between 10 and 30 ° C under a voltage between 3 and 25 volts and which makes it possible to develop an oxide layer in the form of columns.
  • This layer constitutes a good bonding base for an epoxy-type resin and makes it possible to produce composite products which, by bonding together, lead to structures having good resistance to humidity.
  • European patent application No. 181,173 which claims "a process for forming an anodic oxide film on an aluminum strip by continuously passing the strip through an electrolyte containing maintained phosphoric acid. at a temperature between 25 and 80 ° C., the contact time between the strip and the electrolyte being less than 15 seconds, time during which the strip is anodized at a current density of at least 250 A / m2 ".
  • the film obtained constitutes a good bonding base for the application of paints or lacquers or for the production of structures based on aluminum.
  • the anodization temperatures here are much higher than in the previous patent: 25 to 80 ° C instead of 10 to 30 ° C and this is explained in the application as follows: the oxide film which is formed by anodization is partially redissolved by the acid in particular inside the pores which has the effect of enlarging them and increasing the specific surface of the film. If the temperature of the electrolyte is too low, this dissolution is not sufficient to increase the surface. But, on the other hand, this temperature should not be too high either because the film can then be redissolved completely by the acid.
  • the process of this application is only applicable in a range of temperatures recognized as critical by the applicant and this criticality is increased due to the very short contact times of the substrate with the electrolyte which have the effect of causing more dissolution. or less random of the oxide. Hence the obligation to stabilize this dissolution to make very precise temperature, acid concentration, current density, voltage and duration settings, depending on the nature of each of the substrates treated.
  • these compounds react with the oxide, forming a solid bond capable of polymerizing by self-condensation when during rinsing, the pH of the acid electrolyte which covers the surface tends towards neutrality. This process gives the oxide adhesion properties with respect to organic coatings which are particularly good as regards both their solidity and their durability.
  • these compounds contain an organic radical which is chosen according to the nature of the organic coating. These are in particular the vinyl, acrylic, maleic and fumaric radicals.
  • the mineral acid constitutive of the electrolyte, it can be chosen from sulfuric, phosphoric acids and their mixtures. It is preferable for economic reasons to carry out anodization under alternating current but direct current is also suitable.
  • the rinsing be carried out at a temperature of between 70 and 80 ° C. so accelerating the polymerization conditions of the organo metallic compound.
  • the strip thus treated has an oxide surface covered with a monomolecular layer of organometallic compound chemically grafted with oxide and having organophilic properties with regard to organic coatings.
  • a strip of aluminum alloy of type 5052 according to the standards of the Aluminum Association, of thickness 0.24 mm was anodized with the parade by passage for 5 seconds in an electrolyte containing 100 g / l of phosphoric acid and 0 , 5 g / l of methacrylic chromium chloride.
  • the current density being between 8 and 20 A / dm2 and the voltage between 20 and 50 volts, the temperature of the electrolyte has changed between 60 and 70 ° C.
  • the strip was rinsed in water at 65 ° C then dried and finally coated with 12 g / m2 of epoxyphenolic organosol varnish used for the interior coating of boxes and lids.
  • This strip intended for food packaging showed very good adhesion during the tests constituted by multi-pass stamping and the "feathering" tear tests.
  • this last test consisting in subjecting the coated product to a pasteurization operation in demineralized water for 30 minutes at 70 ° C. and then to a tear in the traction bench after a pre-incision of the metal to the back of the coating, it was found that the separation of the coating did not exceed 0.5 mm with respect to the point of the metal breaking.
  • the invention finds its application in obtaining strips of aluminum or aluminum alloy coated with an organic material and intended in particular either for packaging, or for building, or even for making by gluing structural elements composed of several metallic substrates.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Adhesives Or Adhesive Processes (AREA)
EP88420391A 1987-11-23 1988-11-21 Verfahren zur kontinuierlichen anodischen Oxidation von Bändern aus Aluminium oder Aluminiumlegierungen, die mit organischen Produkten überzogen werden sollen Expired - Lifetime EP0318403B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88420391T ATE83511T1 (de) 1987-11-23 1988-11-21 Verfahren zur kontinuierlichen anodischen oxidation von baendern aus aluminium oder aluminiumlegierungen, die mit organischen produkten ueberzogen werden sollen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8716674 1987-11-23
FR8716674A FR2623526B1 (fr) 1987-11-23 1987-11-23 Procede d'anodisation en continu de bandes en aluminium ou en un de ses alliages destinees a etre revetues d'un produit organique

Publications (2)

Publication Number Publication Date
EP0318403A1 true EP0318403A1 (de) 1989-05-31
EP0318403B1 EP0318403B1 (de) 1992-12-16

Family

ID=9357361

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420391A Expired - Lifetime EP0318403B1 (de) 1987-11-23 1988-11-21 Verfahren zur kontinuierlichen anodischen Oxidation von Bändern aus Aluminium oder Aluminiumlegierungen, die mit organischen Produkten überzogen werden sollen

Country Status (6)

Country Link
EP (1) EP0318403B1 (de)
AT (1) ATE83511T1 (de)
DE (1) DE3876763T2 (de)
ES (1) ES2035943T3 (de)
FR (1) FR2623526B1 (de)
GR (1) GR3006569T3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0587525A1 (de) * 1992-08-05 1994-03-16 Alusuisse-Lonza Services Ag Verfahren zur Vorbehandlung von Werkstoffen aus Metallen oder Metallegierungen
WO2017089687A1 (fr) * 2015-11-27 2017-06-01 Constellium Neuf-Brisach Procede de depot electrolytique d'une couche de conversion sous courant alternatif

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3524799A (en) * 1969-06-13 1970-08-18 Reynolds Metals Co Anodizing aluminum

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3524799A (en) * 1969-06-13 1970-08-18 Reynolds Metals Co Anodizing aluminum

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0587525A1 (de) * 1992-08-05 1994-03-16 Alusuisse-Lonza Services Ag Verfahren zur Vorbehandlung von Werkstoffen aus Metallen oder Metallegierungen
CH685300A5 (de) * 1992-08-05 1995-05-31 Alusuisse Lonza Services Ag Verfahren zur Vorbehandlung von Werkstoffen aus Metallen oder Metallegierungen.
WO2017089687A1 (fr) * 2015-11-27 2017-06-01 Constellium Neuf-Brisach Procede de depot electrolytique d'une couche de conversion sous courant alternatif
FR3044329A1 (fr) * 2015-11-27 2017-06-02 Constellium Neuf-Brisach Procede de depot electrolytique d'une couche de conversion sous courant alternatif

Also Published As

Publication number Publication date
GR3006569T3 (de) 1993-06-30
ES2035943T3 (es) 1993-05-01
DE3876763T2 (de) 1993-06-09
DE3876763D1 (de) 1993-01-28
ATE83511T1 (de) 1993-01-15
EP0318403B1 (de) 1992-12-16
FR2623526A1 (fr) 1989-05-26
FR2623526B1 (fr) 1990-02-23

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