EP0127774A2 - Procédé de protection de l'aluminium anodisé - Google Patents

Procédé de protection de l'aluminium anodisé Download PDF

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Publication number
EP0127774A2
EP0127774A2 EP84104941A EP84104941A EP0127774A2 EP 0127774 A2 EP0127774 A2 EP 0127774A2 EP 84104941 A EP84104941 A EP 84104941A EP 84104941 A EP84104941 A EP 84104941A EP 0127774 A2 EP0127774 A2 EP 0127774A2
Authority
EP
European Patent Office
Prior art keywords
anodized
solution
nickel
cobalt
aluminum
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
EP84104941A
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German (de)
English (en)
Other versions
EP0127774A3 (en
EP0127774B1 (fr
Inventor
Elia Maria Alvarez Sanchis
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Publication of EP0127774A2 publication Critical patent/EP0127774A2/fr
Publication of EP0127774A3 publication Critical patent/EP0127774A3/de
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Publication of EP0127774B1 publication Critical patent/EP0127774B1/fr
Expired 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
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/24—Chemical after-treatment

Definitions

  • the invention described here is a method for protecting anodically oxidized aluminum by a metal-containing salt solution at low temperature.
  • Passivation in solutions with chromates has the advantage that it is possible to work at lower temperatures. However, it adversely changes the decorative aspect of the aluminum profiles. It is also state of the art to use metal salts such as nickel fluoride in order to produce high-quality protection of the anodized layer. Although these solutions are used at temperatures between 20 0 C and 42 ° C for the application and therefore constitute a significant energy cost savings, they have the advantage that the anodized aluminum obtained by this treatment has a "green tint", and thereby loses the decorative natural appearance of the disadvantage.
  • the purpose of the present invention is to prevent the so-called "green tinge", which is caused by the use of nickel fluoride as a passivating agent, and to maintain the natural decorative effect of the anodized aluminum, while at the same time providing a high level of corrosion protection against environmental influences, which can be termed “high quality” , is reached.
  • “High quality” is understood to mean a dirt-free surface which does not show any unnatural colors such as the "green tint” and which, according to ISO standard 3210, has protection against corrosion, the maximum weight loss of which was set at 30 mg / dm 2 .
  • the present invention therefore relates to a process in which nickel with cobalt as a cation in the presence of the anions, such as fluoride, fluoroborate and fluorosilicate, etc. is used in solution.
  • anions such as fluoride, fluoroborate and fluorosilicate, etc.
  • Sulfates of the metal-containing salts can also be used, but always in conjunction with fluorine derivatives.
  • the basis of the invention is that the concentrations of the cations nickel and cobalt must be kept in relation to one another in order to maintain the excellent quality of the protection of the anodized layer and at the same time to prevent the occurrence of undesirable color tones such as "greenish tinge".
  • a degreased and pickled aluminum sheet was anodized in an electrolyte of 190 g / 1 sulfuric acid at a temperature of 19 ° C. with direct current for 40 minutes at a current density of 1.5 A / dm 2 .
  • the aluminum sheets were then immersed in a solution of various chemical products at a temperature of 30 ° C. for 12 minutes.
  • the weight loss was determined in accordance with the ISO 3210 standard.
  • Drying of the anodized aluminum treated in the passivation solution can be achieved by treating it in boiling water for 5 minutes or by storing it for 48 hours at an air temperature of 20 ° C to 30 ° C. Warm air drying devices can also be used.
  • the pH should be between 5.0 and 7.0 and the metal salt concentration of at least 0.02 mol / 1 to at most 0.2 mol / 1 must be maintained.
  • Aluminum which was anodized in oxalic acid-sulfuric acid or glycerine-sulfuric acid, also provided high-quality protection through the described passivation solution, even at anodizing bath temperatures above 21 ° C.
  • the aluminum sheets were cleaned by an alkaline degreasing agent before anodizing and then pickled with a mixture of 4% caustic soda and 0.2% sodium chromate at a temperature of 55 ° C. Then they were 10 minutes in nitric acid and 1 min. aftertreated in hydrofluoric acid before being subjected to the anodizing and passivation process as follows:
  • the aluminum sheet sample was anodized after the pretreatment already set out under the following conditions.
  • the sample was immersed in this solution for 12 minutes at 30 ° C and pH 6.4.
  • the weight loss of the dry aluminum sheet was determined according to ISO standard 3210 to be 10.5 mg / dm 2 .
  • the anodized sheet was immersed in a solution containing the following products:
  • the pH of the solution was adjusted to 6.1 and after an immersion time of 15 minutes at 32 ° C. with subsequent rinsing for 5 minutes in hot water, the weight loss according to ISO 3210 was determined to be 13.4 mg / dm 2 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Chemically Coating (AREA)
EP84104941A 1983-05-03 1984-05-03 Procédé de protection de l'aluminium anodisé Expired EP0127774B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES522048 1983-05-03
ES522048A ES8406565A1 (es) 1983-05-03 1983-05-03 Procedimiento para la proteccion del aluminio, previamente anodizado.

Publications (3)

Publication Number Publication Date
EP0127774A2 true EP0127774A2 (fr) 1984-12-12
EP0127774A3 EP0127774A3 (en) 1985-06-19
EP0127774B1 EP0127774B1 (fr) 1988-09-28

Family

ID=8485664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104941A Expired EP0127774B1 (fr) 1983-05-03 1984-05-03 Procédé de protection de l'aluminium anodisé

Country Status (5)

Country Link
EP (1) EP0127774B1 (fr)
AT (1) AT382398B (fr)
DE (1) DE3474319D1 (fr)
ES (1) ES8406565A1 (fr)
PT (1) PT78515B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3522117A1 (de) * 1985-06-20 1987-01-02 Metall Und Oberflaechenchemie Oberflaechenbehandlungsverfahren fuer aluminium und seine legierungen
EP0399172A2 (fr) * 1989-05-26 1990-11-28 Gebr. Happich GmbH Procédé pour obtenir des surfaces colorées sur des pièces en aluminium ou en alliages d'aluminium
EP0399168A1 (fr) * 1989-05-26 1990-11-28 Gebr. Happich GmbH Procédé de colmatage d'une couche d'oxyde obtenue par voie anodique sur des pièces en aluminium ou alliage d'alluminium
WO1992018661A1 (fr) * 1991-04-15 1992-10-29 Henkel Corporation Traitement de surfaces metalliques
EP2728041A1 (fr) * 2012-10-30 2014-05-07 Hydro Aluminium Rolled Products GmbH Bande d'aluminium revêtu et procédé de fabrication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071494A (en) * 1961-09-27 1963-01-01 Koppers Co Inc Sealing of dyed anodized aluminum
JPS54116350A (en) * 1978-03-02 1979-09-10 Nippon Senka Kougiyou Kk Pore sealing treatment of anodic oxide film of aluminium and alloy thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071494A (en) * 1961-09-27 1963-01-01 Koppers Co Inc Sealing of dyed anodized aluminum
JPS54116350A (en) * 1978-03-02 1979-09-10 Nippon Senka Kougiyou Kk Pore sealing treatment of anodic oxide film of aluminium and alloy thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Band 84, Nr 8, Februar 23, 1976, Seite 344, Zusammenfassung 49069c, COLUMBUS, OHIO, (US); & JP-A-50 117 648 (OKUNO CHEMICAL IND. CO. LTD.) 13-09-1975 *
METAL FINISHING ABSTRACTS, Band 22, Nr.4, Juli/August 1980, Seite 269 HAMPTON HILL, (GB); & JP-A-54 116 350 (NIPPON SENKA K.K.) 03-02-1978 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3522117A1 (de) * 1985-06-20 1987-01-02 Metall Und Oberflaechenchemie Oberflaechenbehandlungsverfahren fuer aluminium und seine legierungen
EP0399172A2 (fr) * 1989-05-26 1990-11-28 Gebr. Happich GmbH Procédé pour obtenir des surfaces colorées sur des pièces en aluminium ou en alliages d'aluminium
EP0399168A1 (fr) * 1989-05-26 1990-11-28 Gebr. Happich GmbH Procédé de colmatage d'une couche d'oxyde obtenue par voie anodique sur des pièces en aluminium ou alliage d'alluminium
EP0399172A3 (fr) * 1989-05-26 1991-06-12 Gebr. Happich GmbH Procédé pour obtenir des surfaces colorées sur des pièces en aluminium ou en alliages d'aluminium
WO1992018661A1 (fr) * 1991-04-15 1992-10-29 Henkel Corporation Traitement de surfaces metalliques
EP2728041A1 (fr) * 2012-10-30 2014-05-07 Hydro Aluminium Rolled Products GmbH Bande d'aluminium revêtu et procédé de fabrication
WO2014067937A1 (fr) * 2012-10-30 2014-05-08 Hydro Aluminium Rolled Products Gmbh Bande d'aluminium revêtue et son procédé de fabrication
CN104822865A (zh) * 2012-10-30 2015-08-05 海德鲁铝业钢材有限公司 涂覆铝带材及其制造方法
CN104822865B (zh) * 2012-10-30 2017-02-22 海德鲁铝业钢材有限公司 涂覆铝带材及其制造方法

Also Published As

Publication number Publication date
PT78515A (es) 1984-06-01
ATA147984A (de) 1986-07-15
EP0127774A3 (en) 1985-06-19
ES522048A0 (es) 1984-07-16
ES8406565A1 (es) 1984-07-16
DE3474319D1 (en) 1988-11-03
AT382398B (de) 1987-02-25
PT78515B (es) 1986-07-14
EP0127774B1 (fr) 1988-09-28

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