EP0275043A1 - Acid cleaner for aluminium - Google Patents

Acid cleaner for aluminium Download PDF

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Publication number
EP0275043A1
EP0275043A1 EP88100178A EP88100178A EP0275043A1 EP 0275043 A1 EP0275043 A1 EP 0275043A1 EP 88100178 A EP88100178 A EP 88100178A EP 88100178 A EP88100178 A EP 88100178A EP 0275043 A1 EP0275043 A1 EP 0275043A1
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Prior art keywords
acid
aluminum
cleaner
acidic cleaner
acidic
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EP88100178A
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German (de)
French (fr)
Inventor
Haruyoshi Terada
Youji Nihon Parkerizing Hiratsuka Dormitory Ono
Yokichi Sato
Hideaki Kaneko
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Nihon Parkerizing Co Ltd
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Nihon Parkerizing Co Ltd
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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
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/66—Non-ionic compounds
    • C11D1/75—Amino oxides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/12—Light metals
    • C23G1/125—Light metals aluminium

Definitions

  • the invention relates to an acidic cleaner for surfaces made of aluminum or aluminum alloys containing peroxo compound and surfactant.
  • One form of cleaning surfaces made of aluminum or aluminum alloys uses acidic cleaners, which are usually used at a temperature of 50 to 80 ° C.
  • a disadvantage of the use of such cleaners is that the corrosion attack, in particular on the heat exchanger surfaces and the transport devices of the cleaning device, is considerable.
  • cleaners have been used that also contain chromic acid or chromate. They could not prevail because the use of chromium VI-containing cleaners problems such. B. poses regarding workplace hygiene and wastewater treatment.
  • the object of the invention is to provide an acidic cleaner for surfaces made of aluminum and aluminum alloys, which does not have the disadvantages of the known, in particular the above-mentioned cleaners, meets all the usual requirements for cleaners and is also attractive from an economic point of view.
  • the task is solved by the cleaner of the is initially formulated according to the invention in such a way that it contains 0.05 to 10 g / l peroxo compound, at least one mineral acid from the group consisting of sulfuric acid, phosphoric acid and nitric acid as a surfactant and alkyldimethylamine oxide with 12 to 22 carbon atoms in the alkyl group and has a maximum pH of 2.0.
  • Suitable peroxo compounds are e.g. B. peroxosulfuric acid or its acidic or neutral salts, such as ammonium, potassium or sodium peroxosulfate, peroxodisulfuric acid or its salts, such as ammonium, potassium or sodium peroxodisulfate, peroxoboric acid or its salts, such as ammonium, potassium, sodium, magnesium or lithium peroxoborate, peroxophosphoric acid, peroxodiphosphoric acid, peroxomolybdic acid or their salts.
  • peroxosulfuric acid or its acidic or neutral salts such as ammonium, potassium or sodium peroxosulfate, peroxodisulfuric acid or its salts, such as ammonium, potassium or sodium peroxodisulfate, peroxoboric acid or its salts, such as ammonium, potassium, sodium, magnesium or lithium peroxoborate, peroxophosphoric acid, peroxodiphosphoric acid, perox
  • peroxo compounds of the aforementioned type are effective in acidic cleaner as a builder.
  • Alkyldimethylamine oxide with 12 to 22 carbon atoms in the alkyl chain which according to a preferred embodiment of the invention is present in an amount of 0.05 to 2.0 g / l in the acidic cleaner, is particularly advantageous. It has the general formula below
  • the acidic cleaner according to the invention can contain further surfactants, which can be anionic, cationic or nonionic in nature.
  • the total concentration should not exceed 10 g / l.
  • a cleaner is used whose pH is in the range from 0.6 to 2.0.
  • the cleaning effect is optimal under these conditions.
  • an acidic cleaner which additionally contains fluoride, preferably in an amount of 0.005 to 0.5 g / l. Concentrations below the lower limit mentioned have only little effect. Concentrations above the upper limit increase the pickling rate, but then special precautions with regard to the nature of the workplace and waste water disposal are inevitable.
  • the cleaner can contain chelating agents such as citric acid, tartaric acid or oxalic acid.
  • the heron is used in a manner known per se. For example, contact with the surface to be cleaned can take place in dipping or spraying.
  • the duration of treatment should be chosen so long that there is complete wetting. It essentially depends on the degree of contamination. Generally 10 to 120 seconds are sufficient.
  • the treatment temperature can range from room temperature to approx. 80 ° C. Temperatures in the range from 45 to 70 ° C. are particularly favorable.
  • the surfaces of aluminum or aluminum alloys cleaned by the method according to the invention can, if necessary, be provided with a chemical conversion coating and, if appropriate, subsequently with a lacquer.
  • the cleaner according to the invention is distinguished by an excellent cleaning action. It has the further advantage that it is free of chromium VI and iron III ions, so that there is no pollution of the workplace and expensive wastewater treatment is unnecessary. In addition, the corrosion of the cleaning system is reduced to a minimum.

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

Abstract

Der saure Reiniger für Oberflächen aus Aluminium oder Aluminiumlegierungen enthält 0,05 bis 10 g/l Peroxoverbindung, mindestens eine Mineralsäure aus der Gruppe Schwefelsäure, Phosphorsäure und Salpetersäure und -als Tensid- Alkyldimethylaminoxyd mit 12 bis 22 C-Atomen in der Alkylgruppe, vorzugsweise in einer Menge von 0,05 bis 2,0 g/l. Er weist einen pH-Wert von insbesondere 0,06 bis 2,0 auf. Gemäß einer bevorzugten Ausgestaltung der Erfindung kann der Reiniger zusätzlich Fluorid, insbesondere in einer Menge von 0,005 bis 0,5 g/l enthalten.The acidic cleaner for surfaces made of aluminum or aluminum alloys contains 0.05 to 10 g / l peroxo compound, at least one mineral acid from the group consisting of sulfuric acid, phosphoric acid and nitric acid and - as a surfactant - alkyldimethylamine oxide with 12 to 22 carbon atoms in the alkyl group, preferably in an amount of 0.05 to 2.0 g / l. It has a pH of in particular 0.06 to 2.0. According to a preferred embodiment of the invention, the cleaner can additionally contain fluoride, in particular in an amount of 0.005 to 0.5 g / l.

Description

Die Erfindung betrifft einen sauren Reiniger für Oberflächen aus Aluminium oder Aluminiumlegierungen mit einem Gehalt an Peroxoverbindung und Tensid.The invention relates to an acidic cleaner for surfaces made of aluminum or aluminum alloys containing peroxo compound and surfactant.

Es ist generell üblich, Oberflächen aus Aluminium oder Aluminiumlegierungen zur Entfernung von Schmiermitteln, von Aluminiumflittern, herrührend aus der Verformung, und von sonstigen Verunreinigungen mittels saurer oder alkalischer Reiniger zu säubern. Insbesondere bei der Fertigung von Behältern, wie Dosen, aus Aluminium oder Aluminiumlegierungen ist es unerläßlich, eine gründliche Reinigung nach der Formgebung und Glättung vorzunehmen, damit der in aller Regel anschließend aufgebrachter Konversions- und Lacküberzug das geforderte Haftvermögen besitzt.It is generally customary to clean surfaces made of aluminum or aluminum alloys to remove lubricants, aluminum flakes resulting from the deformation, and other contaminants by means of acidic or alkaline cleaners. Especially when manufacturing containers, such as cans, from aluminum or aluminum alloys, it is essential to carry out thorough cleaning after shaping and smoothing so that the conversion and varnish coating that is subsequently applied has the required adhesive power.

Eine Form der Reinigung von Oberflächen aus Aluminium oder Aluminiumlegierungen bedient sich saurer Reiniger, die üblicherweise bei einer Temperatur von 50 bis 80°C eingesetzt werden. Nachteilig beim Einsatz derartiger Reiniger ist, daß der Korrosionsangriff insbesondere auf die Wärmeaustauscheroberflächen und die Transporteinrichtungen der Reinigungsvorrichtung beträchtlich ist.One form of cleaning surfaces made of aluminum or aluminum alloys uses acidic cleaners, which are usually used at a temperature of 50 to 80 ° C. A disadvantage of the use of such cleaners is that the corrosion attack, in particular on the heat exchanger surfaces and the transport devices of the cleaning device, is considerable.

Um den Korrosionsangriff zu reduzieren, sind Reiniger zum Einsatz gekommen, die zusätzlich Chromsäure oder Chromat enthalten. Sie konnten sich nicht durchsetzen, da die Verwendung von Chrom VI-haltigen Reinigern Probleme z. B. hinsichtlich Arbeitsplatzhygiene und Abwasserbehandlung aufwirft.To reduce the corrosion attack, cleaners have been used that also contain chromic acid or chromate. They could not prevail because the use of chromium VI-containing cleaners problems such. B. poses regarding workplace hygiene and wastewater treatment.

Ein anderer Weg ging daher dahin, Reiniger zu konzipieren, die zur Verringerung des Korrosionsangriffes auf die Reinigungsvorrichtung Eisen III-ionen enthalten [EP-A-18 09 08]. Auch dieser Weg erwies sich als unbefriedigend, da sich auf den äußeren Wänden der Reinigungsvorrichtungen Rost bildete und die Vorrichtung einen schmutzigen und ungepflegten Eindruck machte. Gerade bei der Behandlung von Behältern für beispielsweise Getränke werden jedoch aus hygienischen Gründen besonders reine und gepflegte Reinigungsvorrichtungen erwartet.Another way was therefore to design cleaners which contain iron III ions to reduce the corrosion attack on the cleaning device [EP-A-18 09 08]. This route also proved unsatisfactory, since rust formed on the outer walls of the cleaning devices and the device made a dirty and unkempt impression. Particularly when treating containers for drinks, for example, particularly clean and well-kept cleaning devices are expected for hygienic reasons.

Schließlich sind auch saure Reiniger für Oberflächen aus Aluminium und Aluminiumlegierungen bekannt, die Peroxoverbindungen und Tensid enthalten (US-A-3140 203, 3634 262, 3692 583). Jedoch sind auch sie nicht in der Lage, sämtliche an Reiniger gestellte Anforderungen, insbesondere Wasserbenetzbarkeit, Reinigungsvermögen, geringer Metallabtrag, Vermeidung von Verunreinigungen an der Reinigungsvorrichtung, zu erfüllen.Finally, acidic cleaners for surfaces made of aluminum and aluminum alloys which contain peroxo compounds and surfactant are also known (US Pat. Nos. 3,140,203, 3,634,262, 3,692,583). However, they are also not able to meet all the requirements placed on cleaners, in particular water wettability, cleaning ability, low metal removal, avoidance of contaminants on the cleaning device.

Aufgabe der Erfindung ist es, einen sauren Reiniger für Oberflächen aus Aluminium und Aluminiumlegierungen zur Verfügung zu stellen, der die Nachteile der bekannten, insbesondere vorgenannten Reiniger nicht besitzt, alle an Reiniger üblicherweise gestellte Anforderungen erfüllt und auch unter wirtschaftlichen Gesichtspunkten attraktiv ist.The object of the invention is to provide an acidic cleaner for surfaces made of aluminum and aluminum alloys, which does not have the disadvantages of the known, in particular the above-mentioned cleaners, meets all the usual requirements for cleaners and is also attractive from an economic point of view.

Die Aufgabe wird gelöst, in dem der Reiniger der eingangs genannten Art entsprechend der Erfindung derart formuliert wird, daß er 0,05 bis 10 g/l Peroxoverbindung, mindestens eine Mineralsäure aus der Gruppe Schwefelsäure, Phosphorsäure und Salpetersäure -als Tensid- und Alkyldimethylaminoxyd mit 12 bis 22 C-Atomen in der Alkylgruppe enthält und einen pH-Wert von maximal 2,0 aufweist.The task is solved by the cleaner of the is initially formulated according to the invention in such a way that it contains 0.05 to 10 g / l peroxo compound, at least one mineral acid from the group consisting of sulfuric acid, phosphoric acid and nitric acid as a surfactant and alkyldimethylamine oxide with 12 to 22 carbon atoms in the alkyl group and has a maximum pH of 2.0.

Geeignete Peroxoverbindungen sind z. B. Peroxoschwefelsäure oder deren saure oder neutrale Salze, wie Ammonium-, Kalium- oder Natriumperoxosulfat, Peroxodischwefelsäure oder deren Salze, wie Ammonium-, Kalium- oder Natriumperoxodisulfat, Peroxoborsäure oder deren Salze, wie Ammonium-, Kalium-, Natrium-, Magnesium- oder Lithiumperoxoborat, Peroxophosphorsäure, Peroxodiphosphorsäure, Peroxomolybdänsäure oder deren Salze.Suitable peroxo compounds are e.g. B. peroxosulfuric acid or its acidic or neutral salts, such as ammonium, potassium or sodium peroxosulfate, peroxodisulfuric acid or its salts, such as ammonium, potassium or sodium peroxodisulfate, peroxoboric acid or its salts, such as ammonium, potassium, sodium, magnesium or lithium peroxoborate, peroxophosphoric acid, peroxodiphosphoric acid, peroxomolybdic acid or their salts.

Der Vorzug der Verwendung von Peroxoverbindungen der vorgenannten Art ist, daß die im Anschluß an ihre eigentliche Funktion als Oxidationsmittel nach der Zersetzung entstehenden Verbindungen im sauren Reiniger als Gerüstsubstanz wirksam sind.The advantage of using peroxo compounds of the aforementioned type is that the compounds which arise after their actual function as an oxidizing agent after decomposition are effective in acidic cleaner as a builder.

Alkyldimethylaminoxyd mit 12 bis 22 C-Atomen in der Alkylkette, daß entsprechend einer bevorzugten Ausgestaltung der Erfindung in einer Menge von 0,05 bis 2,0 g/l im sauren Reiniger enthalten ist, zeichnet sich als besonders günstig aus. Es besitzt die nachstehende allgemeine Formel

Figure imgb0001
Alkyldimethylamine oxide with 12 to 22 carbon atoms in the alkyl chain, which according to a preferred embodiment of the invention is present in an amount of 0.05 to 2.0 g / l in the acidic cleaner, is particularly advantageous. It has the general formula below
Figure imgb0001

Neben den vorgenannten Tensid kann der erfindungsgemäße saurer Reiniger weitere Tenside, die anionischer, kationischer oder nichtionischer Art sein können, enthalten. Die Gesamtkonzentration sollte jedoch 10 g/l nicht übersteigen.In addition to the aforementioned surfactant, the acidic cleaner according to the invention can contain further surfactants, which can be anionic, cationic or nonionic in nature. However, the total concentration should not exceed 10 g / l.

Gemäß einer weiteren vorteilhaften Ausführungsform der Erfindung gelangt ein Reiniger zum Einsatz, dessen pH-Wert im Bereich von 0,6 bis 2,0 liegt. Unter diesen Bedingungen ist die Reinigungswirkung optimal.According to a further advantageous embodiment of the invention, a cleaner is used whose pH is in the range from 0.6 to 2.0. The cleaning effect is optimal under these conditions.

Weitere bevorzugte Ausgestaltungen der Erfindung sehen vor, einen sauren Reiniger zu formulieren, der zusätzlich Fluorid, vorzugsweise in einer Menge von 0,005 bis 0,5 g/l enthält. Konzentrationen unter der vorgenannten unteren Grenze zeigen nur noch wenig Wirkung. Konzentrationen über der oberen Grenze erhöhen zwar die Beizgeschwindigkeit, jedoch sind dann besondere Vorkehrungen bezüglich Arbeitsplatzbeschaffenheit und Abwasserbeseitigung unumgänglich.Further preferred embodiments of the invention provide for the formulation of an acidic cleaner which additionally contains fluoride, preferably in an amount of 0.005 to 0.5 g / l. Concentrations below the lower limit mentioned have only little effect. Concentrations above the upper limit increase the pickling rate, but then special precautions with regard to the nature of the workplace and waste water disposal are inevitable.

Sofern erforderlich kann der Reiniger Chelatbildner, wie Zitronensäure, Weinsäure oder Oxalsäure, enthalten.If necessary, the cleaner can contain chelating agents such as citric acid, tartaric acid or oxalic acid.

Die Anwendung des Reihigers geschieht in an sich bekannter Weise. Beispielsweise kann der Kontakt mit der zur reinigenden Oberfläche im Tauchen oder Spritzen erfolgen. Die Behandlungsdauer ist dabei so lang zu wählen, daß eine völlige Benetzung erfolgt. Sie hängt im wesentlichen vom Grad der Verunreinigung ab. Im allgemeinen sind 10 bis 120 sec. ausreichend. Die Behandlungstemperatur kann von Raumtemperatur bis ca. 80°C reichen. Besonders günstig sind Temperaturen im Bereich von 45 bis 70°C.The heron is used in a manner known per se. For example, contact with the surface to be cleaned can take place in dipping or spraying. The duration of treatment should be chosen so long that there is complete wetting. It essentially depends on the degree of contamination. Generally 10 to 120 seconds are sufficient. The treatment temperature can range from room temperature to approx. 80 ° C. Temperatures in the range from 45 to 70 ° C. are particularly favorable.

Die nach dem erfindungsgemäßen Verfahren gereinigten Oberflächen aus Aluminium oder Aluminiumlegierungen können im Bedarfsfall mit einem chemischen Konversionsüberzug und ggf. anschließend mit einem Lack versehen werden.The surfaces of aluminum or aluminum alloys cleaned by the method according to the invention can, if necessary, be provided with a chemical conversion coating and, if appropriate, subsequently with a lacquer.

Der erfindungsgemäße Reiniger zeichnet sich durch eine hervoragende Reinigungswirkung aus. Er besitzt den weiteren Vorzug, daß er frei von Chrom VI- und Eisen-III-ionen ist, so daß eine Verschmutzung des Arbeitsplatzes unterbleibt und aufwendige Abwasserbehandlungen entbehrlich sind. Darüber hinaus wird die Korrosion der Reinigungsanlage auf ein Minimum reduziert.The cleaner according to the invention is distinguished by an excellent cleaning action. It has the further advantage that it is free of chromium VI and iron III ions, so that there is no pollution of the workplace and expensive wastewater treatment is unnecessary. In addition, the corrosion of the cleaning system is reduced to a minimum.

Die Erfindung wird anhand der nachfolgenden Beispiele, die tabellarisch zusammengefaßt sind, näher und beispielsweise erläutert.The invention is explained in more detail and, for example, using the following examples, which are summarized in a table.

Claims (5)

1. Saurer Reiniger für Oberflächen aus Aluminium oder Aluminiumlegierungen mit einem Gehalt an Peroxoverbindung und Tensid, dadurch gekennzeichnet, daß er 0,05 bis 10 g/l Peroxoverbindung, mindestens eine Mineralsäure aus der Gruppe Schwefelsäure, Phosphorsäure und Salpetersäure und -als Tensid- ­Alkyldimethylaminoxyd mit 12 bis 22 C-Atomen in der Alkylgruppe enthält und einen pH-Wert von maximal 2,0 aufweist.1. Acidic cleaner for surfaces made of aluminum or aluminum alloys containing peroxo compound and surfactant, characterized in that it contains 0.05 to 10 g / l peroxo compound, at least one mineral acid from the group consisting of sulfuric acid, phosphoric acid and nitric acid and as a surfactant alkyldimethylamine oxide with 12 to 22 carbon atoms in the alkyl group and has a pH of at most 2.0. 2. Saurer Reiniger nach Anspruch 1, dadurch gekennzeichnet, daß er 0,05 bis 2,0 g/l Alkyldimethylaminoxyd enthält.2. Acidic cleaner according to claim 1, characterized in that it contains 0.05 to 2.0 g / l alkyldimethylamine oxide. 3. Saurer Reiniger nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß er einen pH-Wert von 0,06 bis 2,0 aufweist.3. Acidic cleaner according to claim 1 or 2, characterized in that it has a pH of 0.06 to 2.0. 4. Saurer Reiniger nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß er zusätzlich Fluorid enthält.4. Acidic cleaner according to claim 1, 2 or 3, characterized in that it additionally contains fluoride. 5. Saurer Reiniger nach Anspruch 4, dadurch gekennzeichnet, daß er 0,005 bis 0,5 g/l Fluorid enthält.5. Acidic cleaner according to claim 4, characterized in that it contains 0.005 to 0.5 g / l fluoride.
EP88100178A 1987-01-12 1988-01-08 Acid cleaner for aluminium Withdrawn EP0275043A1 (en)

Applications Claiming Priority (2)

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JP62004778A JPS63172799A (en) 1987-01-12 1987-01-12 Surface cleaning agent of aluminum
JP4778/87 1987-01-12

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EP0275043A1 true EP0275043A1 (en) 1988-07-20

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JP (1) JPS63172799A (en)
DE (1) DE3800337A1 (en)
GB (1) GB2200136B (en)

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Also Published As

Publication number Publication date
GB2200136A (en) 1988-07-27
JPS63172799A (en) 1988-07-16
US4857225A (en) 1989-08-15
DE3800337A1 (en) 1988-07-21
GB2200136B (en) 1991-05-22
GB8800622D0 (en) 1988-02-10

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