EP0118480A1 - Procede de recompression. - Google Patents

Procede de recompression.

Info

Publication number
EP0118480A1
EP0118480A1 EP83902690A EP83902690A EP0118480A1 EP 0118480 A1 EP0118480 A1 EP 0118480A1 EP 83902690 A EP83902690 A EP 83902690A EP 83902690 A EP83902690 A EP 83902690A EP 0118480 A1 EP0118480 A1 EP 0118480A1
Authority
EP
European Patent Office
Prior art keywords
fluoride
nickel salt
solution
salts
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
EP83902690A
Other languages
German (de)
English (en)
Other versions
EP0118480B1 (fr
Inventor
Edgar Gruninger
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.)
FFA FLUG- und FAHRZEUGWERKE AG
FFA FLUG FAHRZEUGWERKE AG
Original Assignee
FFA FLUG- und FAHRZEUGWERKE AG
FFA FLUG FAHRZEUGWERKE AG
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 FFA FLUG- und FAHRZEUGWERKE AG, FFA FLUG FAHRZEUGWERKE AG filed Critical FFA FLUG- und FAHRZEUGWERKE AG
Priority to AT83902690T priority Critical patent/ATE31198T1/de
Publication of EP0118480A1 publication Critical patent/EP0118480A1/fr
Application granted granted Critical
Publication of EP0118480B1 publication Critical patent/EP0118480B1/fr
Expired legal-status Critical Current

Links

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
    • C25D11/246—Chemical after-treatment for sealing layers

Definitions

  • a common feature of all anodic oxidation processes is that the surfaces obtained, whether colorless or colored in one or more stages, are resistant to contact and are sensitive to corrosive substances.
  • various post-compaction processes so-called seal processes, have been developed, through which a contact and corrosion-resistant surface is obtained.
  • the most common of these post-compression processes is treatment with boiling water or steam, known as hot water and steam sealing. These processes require very high energy consumption.
  • Another disadvantage of hot water treatment is the formation of an undesirable deposit of lime and other salts and impurities dissolved in the bath water, which must then be removed mechanically in an additional operation.
  • sealants have been proposed which are generally based on high-molecular compounds, but which in turn make the process more expensive because they have to be supplemented.
  • Metal salts such as nickel salts, for example nickel acetate, have also already been proposed as an addition to the hot water baths in order to intensify the deformation.
  • the compression effect of these salt baths already occurs at a temperature of 70 ° C, so it does not require a boiling temperature, but a very strong one also forms here Rubber that cannot be left on the surface.
  • seal baths known hitherto Another difficulty of the seal baths known hitherto is that they usually have a lifespan of about 3 to 6 weeks. After this time they are unusable and must be thrown away.
  • the present invention therefore relates to a process for the recompression of anodically oxidized, undyed or colored metal surfaces, in particular aluminum surfaces, which is characterized in that the still wet surface is treated at a temperature below 30 ° C. with an aqueous solution which contains at least one nickel salt and contains at least one fluoride.
  • Suitable nickel salts are inorganic nickel salts, such as nickel chloride, sulfate, carbonate, nitrate, etc., and also organic nickel salts, such as nickel acetate and others.
  • the fluoride is preferably a fluoride of an alkali metal salt, such as sodium fluoride, potassium fluoride, etc., or of ammonium, for example (NH. HF 2 , or an organic fluoride.
  • the salts are preferably used in approximately stoichiometric proportions of nickel salt to fluoride, the crystal water present also having to be taken into account in the case of the nickel salt. Larger or smaller amounts of the nickel or fluoride salt can also be used, but the results are generally less good.
  • the optimal addition of salts per liter of bath liquid depends on the surface to be treated and can be determined by simple tests. In general, the total salt state (nickel salt and fluoride) is about 1 to 20 g / liter, with an amount of about 10 g / liter being preferred for aluminum surfaces.
  • the pH of the treatment solution is advantageously in the slightly acidic range, e.g. at 5.5 to 5.8 and can be mixed with a common acid e.g. Acetic acid.
  • the treatment takes place at a temperature below 30 ° C, preferably at room temperature, which can drastically reduce energy consumption.
  • the contact time of the salt solution with the metal surface is not critical. Generally it is at least about 10 minutes.
  • Treatment can be by immersion in a seal bath or by spraying, brushing or in any way.
  • the treated surface is generally rinsed off with cold water after the treatment, but this rinse can easily be omitted without having an adverse effect on the quality of the surface.
  • a preservative is recommended, as is also common for dye baths and other galvanic baths, for example, formalin, "Preventol" and others; in general an addition of 0.01 g / liter is sufficient.
  • the preservative is not water-soluble, it can be added to the aqueous seal solution dissolved in a water-miscible solvent, for example a lower aliphatic alcohol, such as methanol, ethanol, propanol, n- or iso-butanol, etc.
  • a water-miscible solvent for example a lower aliphatic alcohol, such as methanol, ethanol, propanol, n- or iso-butanol, etc.
  • Such an additive can also be recommended for solutions for spraying, brushing, etc., if these solutions are kept open for a long time, since they can easily be contaminated by microorganisms.
  • the seal solutions can contain other conventional additives, such as wetting agents and the like.
  • the surfaces to be treated are subjected to the seal treatment according to the invention while still wet, ie practically immediately after the oxidation or coloring or after the last rinse.
  • the method according to the invention gives the desired ones no more compaction, even if the surface is wetted again. This is in contrast to the previous hot sealing processes, in which the surface can still be compacted in the dry state even after long storage.
  • the method according to the invention results in excellent corrosion resistance and a smooth, attractive appearance of the surface.
  • the compression effect has e.g. aluminum generally reaches its maximum after 24 hours.
  • the treated objects have a permanent corrosion resistance and are suitable for all common uses. No deposits or hydrate formation are observed on the surfaces.
  • the removal rate for aluminum sheet is determined by
  • ISO 3210 which may be up to 30 mg / dm 2 in hot compression according to the currently applicable Euras standard, is around 7 to 10 mg / cm 2 for cold-compressed sheets according to the invention.
  • the removal values obtained are both compared to those of colorless anodized aluminum surfaces and in particular of aluminum surfaces colored, for example, with electrolytic metal salt staining hot-compressed surfaces (with or without added salt) significantly improved.
  • the solutions used according to the invention have the advantage of being significantly less polluting than the previous ones, since their service life is practically unlimited, so they do not have to be thrown away.
  • Another object of the present invention is a commercial agent for performing the above cold sealing process.
  • This agent is characterized by a content of at least one nickel salt and at least one fluoride of the type described above.
  • the agent can be present as a dry mixture, as a paste or as a concentrate. It preferably contains the salts in an approximately stoichiometric ratio of nickel salt. H 2 O to fluoride.
  • the agent may already contain other additives such as wetting agents, preservatives, etc., but these can also be added separately when preparing the solution.
  • the agent has an unlimited shelf life and can be packaged, for example, in such a dosage form that weighing, measurement or the like is no longer necessary when preparing the solution or supplementing it. example 1
  • a bath is made by dissolving 10 g / liter of a mixture of 262.9 g of Ni (SO 4 ). 6H 2 O and 42.0 g NaF in water. 0.5 g / liter of the wetting agent "Ekalin F" (Sandoz) and 0.01 g / liter "Preventol” (Bayer), dissolved in 10 g / liter of butanol, are added to this solution and the pH of the solution to 5 with acetic acid. 6 set.

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)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

Des surfaces métalliques oxydées anodiquement sont comprimées à froid, pendant qu'elles sont traitées à une température inférieure à 30oC dans un état encore mouillé avec une solution aqueuse contenant au moins un sel de nickel et au moins un fluorure. La solution peut contenir d'autres additifs, par exemple un agent conservateur, le cas échéant dissous dans un agent de solubilisation comme des alcools.
EP83902690A 1982-09-03 1983-09-01 Procede de recompression Expired EP0118480B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83902690T ATE31198T1 (de) 1982-09-03 1983-09-01 Nachverdichtungsverfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH525882 1982-09-03
CH5258/82 1982-09-03

Publications (2)

Publication Number Publication Date
EP0118480A1 true EP0118480A1 (fr) 1984-09-19
EP0118480B1 EP0118480B1 (fr) 1987-12-02

Family

ID=4290588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83902690A Expired EP0118480B1 (fr) 1982-09-03 1983-09-01 Procede de recompression

Country Status (4)

Country Link
US (1) US4648911A (fr)
EP (1) EP0118480B1 (fr)
DE (1) DE3374791D1 (fr)
WO (1) WO1984000982A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1205633B (it) * 1983-03-28 1989-03-23 Boston Spa Procedimento e bagno per il fissaggio dell' alluminio e leghe d'alluminio a seguito del trattamento di anodizzazione
ES8406565A1 (es) * 1983-05-03 1984-07-16 Alvarez Sanchis Elia Mari Procedimiento para la proteccion del aluminio, previamente anodizado.
US4647347A (en) * 1984-08-16 1987-03-03 Amchen Products, Inc. Process and sealant compositions for sealing anodized aluminum
US4786336A (en) * 1985-03-08 1988-11-22 Amchem Products, Inc. Low temperature seal for anodized aluminum surfaces
DE3641766A1 (de) * 1986-12-06 1988-06-09 Erbsloeh Julius & August Verfahren zur erzeugung licht- und wetterechter anodisierter und eingefaerbter schichten auf aluminium und aluminiumlegierungen
DE3917188A1 (de) * 1989-05-26 1990-11-29 Happich Gmbh Gebr Verfahren zur erzeugung farbiger oberflaechen auf teilen aus aluminium oder aluminium-legierungen
US5225068A (en) * 1989-05-26 1993-07-06 Gebr. Happich Gmbh Method of compacting an anodically produced layer of oxide on parts of aluminum or aluminum alloy
US5948542A (en) * 1996-03-18 1999-09-07 Mcdonnell Douglas Corporation High-absorptance high-emittance anodic coating
JP3408405B2 (ja) * 1997-07-16 2003-05-19 富士電機株式会社 電子写真用感光体基板および電子写真用感光体
EP1087038A1 (fr) * 1999-09-23 2001-03-28 Clariant International Ltd. Procédé pour colorer des couches d'oxyde d'aluminium
US20050056546A1 (en) * 2003-09-17 2005-03-17 Kia Sheila Farrokhalaee Aluminum vehicle body
DE102007005073A1 (de) * 2007-01-26 2008-07-31 Decoma (Germany) Gmbh Verfahren zum Beschichten einer Oberfläche eines Bauteils
CN102605402A (zh) * 2012-03-28 2012-07-25 东南大学 铝合金制品表面耐磨增韧型复合陶瓷层的制备方法
EP2824221A1 (fr) * 2013-07-12 2015-01-14 Eloxal Höfler GmbH Procédé de fabrication d'un substrat d'aluminium résistant à la corrosion et à l'usure

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2927872A (en) * 1957-12-19 1960-03-08 Samuel L Cohn Dyeing of aluminum oxide coatings
US3071494A (en) * 1961-09-27 1963-01-01 Koppers Co Inc Sealing of dyed anodized aluminum
US3494839A (en) * 1967-01-23 1970-02-10 Amchem Prod Method of sealing chromic acid anodized aluminum surfaces
US4031275A (en) * 1975-12-22 1977-06-21 Aluminum Company Of America Low temperature vapor sealing of anodized aluminum
US4045599A (en) * 1976-01-15 1977-08-30 Aluminum Company Of America Low temperature sealing of anodized aluminum
JPS5415856A (en) * 1978-05-18 1979-02-06 Iseki Agricult Mach Separating and chaff disposing device grain
IT1228581B (it) * 1982-06-29 1991-06-24 Italtecno Srl Procedimento per il fissaggio protettivo dell'ossido anodico di alluminio e sue leghe conferente particolare resistenza agli agenti aggressivi alcalini

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8400982A1 *

Also Published As

Publication number Publication date
DE3374791D1 (en) 1988-01-14
EP0118480B1 (fr) 1987-12-02
US4648911A (en) 1987-03-10
WO1984000982A1 (fr) 1984-03-15

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