EP0066117A1 - Cleaning of surfaces of anodised aluminium and its alloys - Google Patents

Cleaning of surfaces of anodised aluminium and its alloys Download PDF

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EP0066117A1
EP0066117A1 EP82104011A EP82104011A EP0066117A1 EP 0066117 A1 EP0066117 A1 EP 0066117A1 EP 82104011 A EP82104011 A EP 82104011A EP 82104011 A EP82104011 A EP 82104011A EP 0066117 A1 EP0066117 A1 EP 0066117A1
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weight
percent
cleaning
acid
acid solution
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German (de)
French (fr)
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EP0066117B1 (en
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Rainer Dr. Osberghaus
Hans Dr. Ellwanger
Horst Dr. Marsen
Harald Bossek
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Henkel AG and Co KGaA
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Henkel AG and Co KGaA
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    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/08—Acids
    • 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

Definitions

  • the invention relates to an improved method for cleaning surfaces made of anodized aluminum and its alloys.
  • Anodization forms thin layers of aluminum oxide on the surface, which are then compacted in the manufacturing process, usually by treatment with boiling water, so that the pores are closed.
  • the aluminum surfaces treated in this way are very hard and largely protected against the weather.
  • anodically oxidized aluminum surfaces are often used in practice due to their high protective effect and attractive appearance, especially when used outdoors.
  • Large-area aluminum parts with an anodized surface are often used as facade cladding, for example.
  • Neutral cleaning agents are recommended for cleaning anodically oxidized aluminum surfaces and their alloys, as alkaline cleaning agents easily attack the metal surface of the aluminum.
  • abrasive-free neutral cleaners are often not sufficient, particularly in the construction industry, for cleaning heavily soiled metal facades made of aluminum or similar material. If neutral cleaners containing an abrasive component are used, the desired effect can be achieved, but these processes are quite time-consuming and costly.
  • Short-chain phosphoric acid esters have also been proposed as an acidic, low-attack cleaning component. Without mechanical support, however, such agents only remove lightly adhering soiling.
  • acidic cleaners for anodized aluminum surfaces are known from DE-AS 27 21 573. These agents consist of an acidic treatment solution in the pH range of 0.8 to 3 and contain complex fluorine compounds of boron, aluminum, silicon, titanium or zirconium, individually or as a mixture. A good cleaning effect is achieved, whereby after an exposure time of
  • a 65 percent solution is expediently used as the nitric acid.
  • the phosphoric acid partial esters used are mixtures of mono- and diphosphoric acid esters. Products of this type can be produced by reacting phosphoric acid with aliphatic alcohols having 1 to 3 carbon atoms.
  • 1-hydroxyalkane-1,1-diphosphonic acids in particular, in particular in the form of 1-hydroxyethane-1,1-diphosphonic acid, and 1-aminoalkane-1,1-diphasphonic acid n or phosphonic acids containing carboxyl groups, such as 2- Phosphono-1,2,4-butane tricarboxylic acid or in particular nitrilotrimethylene phosphonic acid into consideration.
  • Suitable surfactants are alkyl sulfonic acids with a chain length of C 8 to C 18 and / or alkylbenzenesulfonic acid with 8 to 15 C atoms in the alkyl radical and / or nonionic surfactants, such as adducts of 8 to 15 moles of ethylene oxide with alkylphenols, the alkyl radical of which has 8 to 12 C atoms contains as well as fatty alcohols with 8 to 18 carbon atoms.
  • Suitable solubilizers and / or solvents are aliphatic alcohols, such as ethyl, propyl, isopropyl or n-butyl alcohols.
  • the cleaning solutions described above are applied to the anodized surface in a thin film at ambient temperature. This can be done, for example, by spraying, but expediently by brushing, rolling or by hand wiping. After the solution has had sufficient time to act, it is then rinsed off with water.
  • a major advantage of the procedure described above is that the solution can remain on the surface for a relatively long time without any noticeable attack on the aluminum oxide layer.
  • a uniform and very dirty looking anodized façade was divided into three test fields, each measuring 50 x 50 cm.
  • the middle test area was cleaned as well as possible with the abrasive cleaner.
  • Two acidic cleaners were tested against this standard. The cleaners were applied undiluted to the test field evenly without pressure using a washer saturated with the test solution, so that a homogeneous, thin cleaning film remained. After an exposure time of 2 minutes, it was washed with plenty of water using a lambskin wiper and the remaining moisture was scraped off.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Detergent Compositions (AREA)
  • Lubricants (AREA)

Abstract

This invention relates to an improved process for cleaning an anodized surface of aluminum or an alloy thereof where a cleaning agent is applied to the anodized surface and then the cleaning agent is removed after a sufficient period of contact, wherein the improvement comprises applying to the anodized surface at ambient temperature a thin film of a cleaning composition comprising an acid solution consisting essentially of: (a) from about 3 to 30 percent by weight, based upon the total weight of the acid solution, of nitric acid, calculated as a 65% aqueous solution; (b) from about 0.1 to 20 percent by weight, based upon the total weight of the acid solution, of partial esters of phosphoric acid; (c) from about 0.3 to 30 percent by weight, based upon the total weight of the acid solution, of a phosphonocarboxylic acid with complexing action; (d) from about 0.5 to 30 percent by weight, based upon the total weight of the acid solution, of nonionic and/or anionic tensides; (e) from 0 to about 30 percent by weight, based upon the total weight of the acid solution, of solubilizers and/or organic solvents; and (f) from about 40 to 90 percent by weight, based upon the total weight of the acid solution, of water, said solution having a pH of less than 2, and then rinsing off the cleaning composition with water.

Description

Gegenstand der Erfindung ist ein verbessertes Verfahren zur Reinigung von Oberflächen aus anodisch oxidiertem Aluminium und dessen Legierungen.The invention relates to an improved method for cleaning surfaces made of anodized aluminum and its alloys.

Durch eine Anodisierung werden dünne Schichten aus Aluminiumoxid-auf der Oberfläche ausgebildet, die im Herstellungsprozeß dann, meistens durch Behandlung mit siedendem Wasser, verdichtet werden, so daß die Poren verschlossen sind. Die so behandelten Aluminiumoberflächen sind sehr hart und gegen Witterungseinflüsse weitgehend geschützt.Anodization forms thin layers of aluminum oxide on the surface, which are then compacted in the manufacturing process, usually by treatment with boiling water, so that the pores are closed. The aluminum surfaces treated in this way are very hard and largely protected against the weather.

Daher gelangen in der Praxis anodisch oxidierte Aluminiumoberflächen wegen der hohen Schutzwirkung und des attraktiven Aussehens, insbesondere bei Außenanwendung, häufig zum Einsatz. Großflächige Aluminiumteile mit anodisch oxidierter Oberfläche werden beispielsweise oft als Fassadenverkleidung verwendet.For this reason, anodically oxidized aluminum surfaces are often used in practice due to their high protective effect and attractive appearance, especially when used outdoors. Large-area aluminum parts with an anodized surface are often used as facade cladding, for example.

Zur Reinigung von anodisch oxidierten Aluminiumoberflächen und dessen Legierungen werden neutrale Reinigungsmittel empfohlen, da alkalisch wirkende Reiniger leicht die Metalloberfläche des Aluminiums angreifen.Neutral cleaning agents are recommended for cleaning anodically oxidized aluminum surfaces and their alloys, as alkaline cleaning agents easily attack the metal surface of the aluminum.

Die Reinigungswirkung schleifmittelfreier neutraler Reiniger ist insbesondere im Bauwesen zur Reinigung stark verschmutzter Metallfassaden aus Aluminium oder ähnlichem Material häufig nicht ausreichend. Verwendet man neutrale Reiniger, die eine abrasive Komponente enthalten, so kann zwar der gewünschte Effekt erzielt werden, jedoch sind diese Verfahren recht zeitraubend und kostenaufwendig.The cleaning effect of abrasive-free neutral cleaners is often not sufficient, particularly in the construction industry, for cleaning heavily soiled metal facades made of aluminum or similar material. If neutral cleaners containing an abrasive component are used, the desired effect can be achieved, but these processes are quite time-consuming and costly.

Als saure, wenig angreifende Reinigungskomponente wurden auch schon kurzkettige Phosphorsäureester vorgeschlagen. Ohne mechanische Unterstützung entfernen aber auch derartige Mittel nur leicht anhaftende Verschmutzungen.Short-chain phosphoric acid esters have also been proposed as an acidic, low-attack cleaning component. Without mechanical support, however, such agents only remove lightly adhering soiling.

Schließlich sind saure Reiniger für anodisch oxidierte Aluminiumoberflächen aus der DE-AS 27 21 573 bekannt. Diese Mittel bestehen aus einer sauren Behandlungslösung im pH-Bereich von 0,8 bis 3 und enthalten komplexe Fluorverbindungen des Bors, Aluminiums, Siliziums, Titans oder Zirkoniums einzeln oder im Gemisch. Es wird eine gute Reinigungswirkung erzielt, wobei nach einer Einwirkungszeit vonFinally, acidic cleaners for anodized aluminum surfaces are known from DE-AS 27 21 573. These agents consist of an acidic treatment solution in the pH range of 0.8 to 3 and contain complex fluorine compounds of boron, aluminum, silicon, titanium or zirconium, individually or as a mixture. A good cleaning effect is achieved, whereby after an exposure time of

bis zu 5 Minuten kein meßbarer Angriff auf die Oxidschicht eintritt.no measurable attack on the oxide layer occurs for up to 5 minutes.

Bei der Fassadenreinigung können jedoch erheblich längere Verweilzeiten des Reinigers, insbesondere an weniger zugänglichen Fassadenelementen, nicht ausgeschlossen werden. Für die Praxis wäre es daher von erheblichem Vorteil, wenn ein Reinigungsverfahren angewandt werden kann, das mit geringerem Aufwand als bei der abrasiven Reinigung die Entfernung auch stärkerer Verschmutzungen von Metallfassaden gestattet, ohne daß das Fassadenmaterial bei längerem Kontakt mit dem Reiniger angegriffen wird.When cleaning facades, however, considerably longer dwell times of the cleaner, especially on less accessible facade elements, cannot be ruled out. In practice, it would therefore be of considerable advantage if a cleaning process can be used which is less expensive than that of abrasive cleaning allows the removal of even heavier soiling from metal facades without the facade material being attacked by prolonged contact with the cleaner.

Gegenstand der Erfindung ist ein Verfahren zur Reinigung von anodisch oxidierten Aluminiumoberflächen und dessen Legierungen mittels wäßriger saurer Lösungen, die bei Umgebungstemperatur als dünner Film aufgetragen und nach hinreichender Einwirkung mit Wasser wieder abgespült werden, dadurch gekennzeichnet, daß man die Behandlung mit sauren Lösungen (pH-Bereich kleiner als 2) durchführt, die

  • a. 5 bis 20 Gewichtsprozent HNO3 (berechnet als 65 %ige Lösung)
  • b. 0,2 bis 10 Gewichtsprozent Phosphorsäurepartialester
  • c. 0,5 bis 20 Gewichtsprozent komplexierend-wirkende Phosphonsäure.oder.Phosphonocarbonsäure
  • d. 1 bis 20 Gewichtsprozent nichtionische und/oder anionische Tenside
  • e. 0 bis 30 Gewichtsprozent Lösungsvermittler und/ oder organische Lösungsmittel sowie
  • f.40 bis 90 Gewichtsprozent Wasser. enthalten.
The invention relates to a process for cleaning anodically oxidized aluminum surfaces and their alloys by means of aqueous acidic solutions, which are applied as a thin film at ambient temperature and rinsed off again after exposure to water, characterized in that the treatment with acidic solutions (pH Area less than 2)
  • a. 5 to 20 percent by weight HNO 3 (calculated as a 65% solution)
  • b. 0.2 to 10 percent by weight phosphoric acid partial ester
  • c. 0.5 to 20 percent by weight complexing phosphonic acid or phosphonocarboxylic acid
  • d. 1 to 20 percent by weight of nonionic and / or anionic surfactants
  • e. 0 to 30 weight percent solubilizers and / or organic solvents as well
  • f .40 to 90 weight percent water. contain.

Als Salpetersäure wird zweckmäßigerweise eine 65 prozentige Lösung verwendet. Bei den zur Anwendung gelangenden Phosphorsäurepartialestern handelt es sich um Gemische aus Mono- und Diphosphorsäureester. Derartige Produkte können durch Umsetzung von Phosphorsäure mit aliphatischen Alkoholen mit 1 bis 3 C-Atomen hergestellt werden.A 65 percent solution is expediently used as the nitric acid. The phosphoric acid partial esters used are mixtures of mono- and diphosphoric acid esters. Products of this type can be produced by reacting phosphoric acid with aliphatic alcohols having 1 to 3 carbon atoms.

Es sind in letzter Zeit zahlreiche Phosphonsäuren be- schrieben worden, die komplexierend wirkende Eigenschaften aufweisen. Für die vorliegenden Zwecke kommen insbesondere 1-Hydroxyalkan-1,1-diphosphonsäuren,insbesondere in Form der 1-Hydroxyethan-1,1-diphosphonsäure,sowie 1-Aminoalkan-1,1-diphasphonsäuren oder auch Carboxylgruppen enthaltende Phosphonsäuren, wie 2-Phosphono-1,2,4-butantricarbonsäure oder auch insbesondere Nitrilotrimethylenphosphonsäure in Betracht.There are numerous phosphonic be lately - been written, which have complexing properties acting. For the present purposes, 1-hydroxyalkane-1,1-diphosphonic acids in particular, in particular in the form of 1-hydroxyethane-1,1-diphosphonic acid, and 1-aminoalkane-1,1-diphasphonic acid n or phosphonic acids containing carboxyl groups, such as 2- Phosphono-1,2,4-butane tricarboxylic acid or in particular nitrilotrimethylene phosphonic acid into consideration.

Als Tenside kommen Alkylsulfonsäuren der Kettenlänge C8 bis C18 und/oder Alkylbenzolsulfonsäure mit 8 bis 15 C-Atomen im Alkylrest und/oder nichtionische Tenside, wie Anlagerungsprodukte von 8 bis 15-Mol Ethylenoxid an Alkylphenole, deren Alkylrest 8 bis 12 C-Atome enthält sowie an Fettalkohole mit 8 bis 18 C-Atomen in Betracht.Suitable surfactants are alkyl sulfonic acids with a chain length of C 8 to C 18 and / or alkylbenzenesulfonic acid with 8 to 15 C atoms in the alkyl radical and / or nonionic surfactants, such as adducts of 8 to 15 moles of ethylene oxide with alkylphenols, the alkyl radical of which has 8 to 12 C atoms contains as well as fatty alcohols with 8 to 18 carbon atoms.

Als Lösungsvermittler und/oder Lösungsmittel sind geeignet aliphatische Alkohole, wie Ethyl-, Propyl-, Isopropyl- oder n-Butylalkohole.Suitable solubilizers and / or solvents are aliphatic alcohols, such as ethyl, propyl, isopropyl or n-butyl alcohols.

Weiterhin finden als Lösungsvermittler bekannte Verbindungen, wie Natriumcumolsulfonat beziehungsweise Cumolsulfonsäure Anwendung.Known compounds such as sodium cumene sulfonate or cumene sulfonic acid are also used as solubilizers.

In manchen Fällen hat es sich als vorteilhaft erwiesen, den sauren Lösungen noch Paraffinöl oder Siliconöle als pflegende Komponente in geringen Mengen hinzuzufügen. Die beschriebenen Mittel werden in relativ konzentrierten Lösungen angewendet. Der Wassergehalt beträgt 40 bis 90, vorzugsweise 49 bis 80 Gewichtsprozent.In some cases it has proven advantageous to add small amounts of paraffin oil or silicone oils as a caring component to the acidic solutions. The agents described are used in relatively concentrated solutions. The water content is 40 to 90 , preferably 49 to 80 percent by weight.

Die oben beschriebenen Reinigungslösungen werden bei Umgebungstemperatur auf die anodisierte Oberfläche in dünnem Film aufgetragen. Dies kann beispielsweise durch Aufsprühen, zweckmäßigerweise aber durch Bürsten, Aufwalzen oder im Handwischverfahren, geschehen. Nach hinreichender Einwirkungszeit der Lösung wird diese dann mit Wasser abgespült. Ein wesentlicher Vorteil der oben beschriebenen Arbeitsweise besteht darin, daß die Lösung längere Zeit auf der Oberfläche verbleiben kann, ohne daß ein merklicher Angriff auf die Aluminiumoxidschicht erfolgt.The cleaning solutions described above are applied to the anodized surface in a thin film at ambient temperature. This can be done, for example, by spraying, but expediently by brushing, rolling or by hand wiping. After the solution has had sufficient time to act, it is then rinsed off with water. A major advantage of the procedure described above is that the solution can remain on the surface for a relatively long time without any noticeable attack on the aluminum oxide layer.

BeispieleExamples a. Prüfung der Schädigung von anodisch oxidiertema. Testing the damage of anodized Aluminium durch saure ReinigerAluminum through acidic cleaners

Es wurden 16 x 8 cm große,nach üblichen Verfahren anodisch oxidierte hellbronzene Aluminiumprüfbleche verwendet. Die Schichtdicke, die in der nachstehenden Tabelle 2 angegeben ist, lag zwischen 17 und 23 µm,Die Aluminiumbleche wurden bei 20°C für 20 Stunden zur Hälfte in die konzentrierten Testlösungen getaucht.Die Testlösungen (A-G) hatten die aus der Tabelle 1 ersichtliche Zusammensetzung. Danach wurden die Bleche mit Wasser abgewaschen und auf eventuelle Farbänderungen untersucht. Es wurde auch die Dicke der anodischen Oxidschicht sowie der Scheinleitwert Y und der dielektrische Verlustfaktor d der Testfläche im Vergleich zur unbehandelten Hälfte des Prüfbleches gemessen. Als Vergleichstestlösung (H) wurde dabei auch ein saurer Reiniger verwendet, der die nachstehende Zusammensetzung hatte:

Figure imgb0001
16 x 8 cm, light bronze aluminum test sheets anodized by customary methods were used. The layer thickness, which is given in Table 2 below, was between 17 and 23 µm. The aluminum sheets were half immersed in the concentrated test solutions at 20 ° C. for 20 hours. The test solutions (AG) had the composition shown in Table 1 . The sheets were then washed off with water and examined for any color changes. The thickness of the anodic oxide layer as well as the apparent conductance Y and the dielectric loss factor d of the test area were measured in comparison to the untreated half of the test sheet. An acidic cleaner with the following composition was also used as the comparative test solution (H):
Figure imgb0001

Die Ergebnisse sind in Tabelle 2 enthalten.

Figure imgb0002
Figure imgb0003
 The results are shown in Table 2.
Figure imgb0002
Figure imgb0003

b.Prüfung der Reinigungswirkungb.Checking the cleaning effect

In einem Praxistest, der unter standardisierten Bedingungen durchgeführt wurde, wurde die reinigende Wirkung der Testprodukte A bis G gemäß Tabelle 1 im Vergleich zu einem abrasiven Reiniger der folgenden Rezeptur überprüft:In a practical test, which was carried out under standardized conditions, the cleaning effect of test products A to G according to Table 1 was checked in comparison to an abrasive cleaner of the following formulation:

Abrasiver GrundreinigerAbrasive basic cleaner

Figure imgb0004
Eine gleichmäßig und stark verschmutzt aussehende Eloxalfassadenfläche wurde in drei Prüffelder von jeweils 1 50 x 50 cm unterteilt. Das mittlere Prüffeld wurde mit dem abrasiven Reiniger so gut wie möglich gereinigt. Gegen diesen Standard wurden jeweils 2 sauer eingestellte Reiniger getestet. Die Reiniger wurden unverdünnt mittels eines mit der Prüflösung..gesättigten Einwaschers gleichmäßig ohne Druck auf das Testfeld aufgetragen, so daß ein homogener dünner Reinigungsfilm zurückblieb. Nach einer Einwirkungszeit von 2 Minuten wurde mittels eines Lammfellwischers mit viel Wasser abgewaschen und die restliche Feuchtigkeit abgerakelt.
Figure imgb0004
 A uniform and very dirty looking anodized façade was divided into three test fields, each measuring 50 x 50 cm. The middle test area was cleaned as well as possible with the abrasive cleaner. Two acidic cleaners were tested against this standard. The cleaners were applied undiluted to the test field evenly without pressure using a washer saturated with the test solution, so that a homogeneous, thin cleaning film remained. After an exposure time of 2 minutes, it was washed with plenty of water using a lambskin wiper and the remaining moisture was scraped off.

Die Reinigungswirkung der beiden Testprodukte wurde jeweils im Vergleich zum Standard von drei unabhängig voneinander urteilenden Prüfern nach folgendem Schema bewertet:

Figure imgb0005
The cleaning effect of the two test products was evaluated in comparison to the standard by three independent assessors according to the following scheme:
Figure imgb0005

Die Tests würden an zwei weiteren Fassaden, die anders getönt waren, wiederholt. Die maximal erreichbare Punktzahl betrug somit 9 Punkte. Ab 6 Punkten wurde das Testprodukt in der Gesamtbeurteilung besser als der Standard eingestuft, bei 4 - 5,5 Punkten wurde es gleich, unter 4 Punkten schlechter als der Standard eingestuft.The tests were repeated on two other facades that were tinted differently. The maximum possible score was 9 points. From 6 points the test product was rated better than the standard in the overall assessment, with 4 - 5.5 points it was rated the same, below 4 points worse than the standard.

Die Ergebnisse sind aus Tabelle 3 ersichtlich.

Figure imgb0006
Diese Versuchsergebnisse zeigen die überaus gute Reinigungsleistung der erfindungsgemäßen Produkte. Die Kombinationen, insbesondere D und E, sind der alleinigen Wirkung der Salpetersäure (Produkt G) deutlich überlegen. Aus Tabelle 2 geht hervor, daß das flußsäurehaltige Produkt bereits nach 1 Stunde / 20°C äußerst starke Schädigung verursacht, wohingegen die erfindungsgemäßen Produkte selbst nach 20 Stunden / 20°C keine gravierende Veränderung der anodischen Oxidationsschicht hervorrufen.The results are shown in Table 3.
Figure imgb0006
 These test results show the extremely good cleaning performance of the products according to the invention. The combinations, especially D and E , are clearly superior to the sole action of nitric acid (product G). Table 2 shows that the product containing hydrofluoric acid causes extremely severe damage after only 1 hour / 20 ° C., whereas the products according to the invention do not cause a serious change in the anodic oxidation layer even after 20 hours / 20 ° C.

Claims (1)

Verfahren zur Reinigung von anodisch oxidierten Aluminiumoberflächen und dessen Legierungen mittels wäßriger saurer Lösungen, die bei Umgebungstemperatur als dünner Film aufgetragen und nach hinreichender Einwirkung mit Wasser wieder abgespült werden, dadurch gekennzeichnet, daß man die Behandlung mit sauren Lösungen (pH-Bereich kleiner als 2) durchführt, die a. 5 bis 20 Gewichtsprozent HN03 (berechnet als 65 %ige Lösung) b. 0,2 bis 10 Gewichtsprozent Phosphorsäurepartialester c. 0,5 bis 20 Gewichtsprozent komplexierend wirkende Phosphonsäure oder Phosphonocarbonsäure d. 1 bis 20 Gewichtsprozent nichtionische und/oder anionische Tenside e. 0 bis 30 Gewichtsprozent Lösungsvermittler und/ oder organische Lösungsmittel sowie f. 40 bis 90 Gewichtsprozent Wasser enthalten. Process for cleaning anodically oxidized aluminum surfaces and their alloys by means of aqueous acidic solutions which are applied as a thin film at ambient temperature and rinsed off again after exposure to water, characterized in that the treatment with acidic solutions (pH range less than 2) performs that a. 5 to 20 percent by weight HN0 3 (calculated as a 65% solution) b. 0.2 to 10 percent by weight phosphoric acid partial ester c. 0.5 to 20 percent by weight complexing phosphonic acid or phosphonocarboxylic acid d. 1 to 20 percent by weight of nonionic and / or anionic surfactants e. 0 to 30 weight percent solubilizers and / or organic solvents as well f . Contain 40 to 90 weight percent water.
EP82104011A 1981-05-16 1982-05-08 Cleaning of surfaces of anodised aluminium and its alloys Expired EP0066117B1 (en)

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AT82104011T ATE8512T1 (en) 1981-05-16 1982-05-08 CLEANING OF SURFACES MADE OF ANODISED ALUMINUM AND ITS ALLOYS.

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DE3119538 1981-05-16
DE19813119538 DE3119538A1 (en) 1981-05-16 1981-05-16 CLEANING OF SURFACES FROM ANODIZED ALUMINUM AND ITS ALLOYS

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CA2248568A1 (en) * 1997-01-09 1998-07-16 Scott J. Beleck Acid deoxidizing/etching composition and process suitable for vertical aluminum surfaces
FR2827610B1 (en) * 2001-07-17 2005-09-02 Commissariat Energie Atomique DEGREASING COMPOSITION USEFUL FOR DEGREASING AND / OR DECONTAMINATING SOLID SURFACES
DE102013226533A1 (en) * 2013-12-18 2015-06-18 MAHLE Behr GmbH & Co. KG Cleaner for an aluminum component and a process for cleaning aluminum components
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DE3260401D1 (en) 1984-08-23
US4404039A (en) 1983-09-13
CA1177372A (en) 1984-11-06
ATE8512T1 (en) 1984-08-15
DE3119538A1 (en) 1982-12-02
EP0066117B1 (en) 1984-07-18

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