EP0351680B1 - Use of p-toluene sulfonic acid in the electrolytic colouring of anodically obtained aluminium surfaces - Google Patents
Use of p-toluene sulfonic acid in the electrolytic colouring of anodically obtained aluminium surfaces Download PDFInfo
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- EP0351680B1 EP0351680B1 EP89112555A EP89112555A EP0351680B1 EP 0351680 B1 EP0351680 B1 EP 0351680B1 EP 89112555 A EP89112555 A EP 89112555A EP 89112555 A EP89112555 A EP 89112555A EP 0351680 B1 EP0351680 B1 EP 0351680B1
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- 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
- C25D11/14—Producing integrally coloured layers
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- 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
- C25D11/20—Electrolytic after-treatment
- C25D11/22—Electrolytic after-treatment for colouring layers
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- the invention relates to the electrolytic coloring of anodically produced surfaces of aluminum and / or aluminum alloys in aqueous electrolytes containing silver salt by means of alternating current and using p-toluenesulfonic acid.
- Chemical Abstracts 105 (10), Unit 87 431z, discloses the electrolytic coloring of aluminum using an electrolyte containing silver nitrate and sulfuric acid. The coloring process was used for the surface treatment of lamps and aluminum workpieces. It is described that the problems that usually arise from dyeing with organic dyes are solved.
- JP-A 55-131195 describes the electrolytic coloring of aluminum with a number of metal salts.
- said electrolytic coloring is carried out.
- Metal Finishing Abstracts, Vol 23 (1981), No. 1, page 25 F also describes a process for the electrolytic coloring of anodized aluminum, in which an electrolysis bath, the salts of nickel Contains cobalt, tin or copper in the form of sulfate, sulphamate, oxalate, tartrate or phosphate.
- the bath also contains 5 to 100 g / l p-toluenesulfonate sodium salt or similar compounds and unsaturated compounds, for example formaldehyde, benzylidene acetone, pyridine, quinoline, butynediol, ethylene cyanohydrin, thiourea or azo dyes.
- the coloring tape contains a silver salt, for example 0.5 g / l silver sulfate and 1 g / l tin sulfate, 20 g / l sulfosalicylic acid, 20 g / l magnesium sulfate and 10 g / l sulfuric acid.
- a silver salt for example 0.5 g / l silver sulfate and 1 g / l tin sulfate, 20 g / l sulfosalicylic acid, 20 g / l magnesium sulfate and 10 g / l sulfuric acid.
- the aluminum treated in this way is then immersed in an acidic bath containing, for example, sulfuric acid or nitric acid, or in a neutral bath containing, for example, thiosulfate or thiogluconate. This results in permanent and light-colored layers, for example light-orange colored layers.
- the invention thus relates to the use of p-toluenesulfonic acid and / or its water-soluble alkali metal, ammonium and / or alkaline earth metal salts for the electrolytic coloring of anodized surfaces of aluminum and / or aluminum alloys, which is characterized in that aqueous electrolyte solutions are used, the 0 , Contain 1 to 10 g / l silver in the form of water-soluble salts, and apply alternating current or alternating current superimposed on direct current.
- the electrolytic coloring according to the invention also has the decorative effect has the advantage that it can be easily and permanently over-dyed with organic dyes and so, for example, with dyes such as Sanodalblau R from Sandoz AG, Basel, Switzerland, a lightfast green can also be achieved as a combination dyeing.
- p-toluenesulfonic acid also includes their water-soluble alkali metal salts and / or their water-soluble alkaline earth metal salts.
- p-toluenesulfonic acid is used in the form of the monohydrate because of its better solubility in water.
- p-toluenesulfonic acid is used in an amount of 3 to 100 g / l electrolytic solution, while a preferred embodiment of the present invention consists in using 5 to 25 g / l p-toluenesulfonic acid.
- the electrolytic solution contains the silver in the form of nitrate, acetate and / or sulfate.
- the electrolyte solution contains 0.3 to 1.2 g / l of silver in the form of water-soluble salts, preferably in the form of nitrate, acetate and / or sulfate.
- the use of silver sulfate is preferred.
- a further embodiment of the present invention consists in that the electrolyte solution, if desired, 2.5 to 100 g / l sulfuric acid and / or its alkali metal, ammonium and / or contains alkaline earth metal salts.
- a particular embodiment of the present invention is that an electrolyte solution is used which contains 2.5 to 25 g / l sulfuric acid.
- the alkali metal, ammonium and / or alkaline earth metal salts which can be used instead of or together with this are those of sodium, potassium, ammonium, magnesium or mixtures thereof, preferably in the form of the sulfates and / or the acetates.
- magnesium sulfate together with or instead of the sulfuric acid is particularly preferred.
- a terminal voltage of 4 to 20 V is set according to the invention.
- a preferred embodiment of the present invention is to set the terminal voltage in the range from 8 to 16 V.
- Alternating current or alternating current superimposed with direct current is used.
- the "alternating current superimposed with direct current” is equivalent to "direct current superimposed with alternating current”.
- the voltage applied to the bath is defined as the terminal voltage.
- the generation of gold tones is preferred within the scope of the invention. These preferably result in a voltage range of 8 to 16 V, the treatment times should be shorter the higher the voltage is selected. In this sense, the treatment times are usually in the range of 0.5 to 3 minutes.
- brown tones result in dyeing times of more than 3 min and higher voltage values, i.e. especially more than 10 V.
- Voltage values of more than 16 V should generally be avoided with dyeing times of more than 3 minutes, since otherwise the oxide layer may flake off.
- Electrolyte solutions which contain further cations can also be used within the scope of the invention. Preferred as such are: Cu (II), Ni (II) and Co (II). This results in a wide range of other warm colors.
- test sheets (dimension 50 mm x 40 mm x 1 mm) made of the material Almg 1 (DIN material no. 3.3315) were used.
- the sheets were degreased, pickled and pickled using conventional methods.
- the degreasing was carried out with an alkaline cleaner containing borates, carbonates, phosphates and nonionic surfactants (P3-almeco R 18, Henkel KGaA, Düsseldorf), bath concentration 5% by weight at 70 ° C. in the course of 15 minutes.
- a mixture (3: 1) of sodium hydroxide and a pickling agent containing alkali, alcohols and salts of inorganic acids (P3-almeco R 46, Henkel KGaA, Duesseldorf) was used.
- the pickling was carried out using an acidic pickling agent containing salts of inorganic acids and inorganic acids (P3-almeco R 90, Henkel KGaA, Düsseldorf), in a concentration of 15% by weight, at a temperature of 20 ° C. in the course of 3 minutes .
- P3-almeco R 90 Henkel KGaA, Düsseldorf
- the subsequent anodization was carried out using the direct current sulfuric acid method; Bath composition: 180 g / l sulfuric acid, 10 g / l aluminum, air injection: 8 m3 / m2h, temperature: 20 ° C, DC voltage 15 V, current density 1.4 A / dm2, anodizing time: 2700 to 3600 sec, depending on the requirements for the production of a constant oxide layer of 20 ⁇ m.
- the sheets were then rinsed again and subjected to a compression process. At a temperature of about 98 ° C in the course of 60 min. (corresponding to 3 min./ ⁇ m) the compression.
- a sealing coating inhibitor based on polycarboxylic acids and ammonium acetate was used as a buffer substance (P3-almeco R seal SL, Henkel KGaA, Düsseldorf).
Abstract
Description
Die Erfindung betrifft die elektrolytische Färbung anodisch erzeugter Oberflächen von Aluminium und/oder Aluminiumlegierungen in silbersalz-haltigen, wäßrigen Elektrolyten mittels Wechselstrom und unter Verwendung von p-Toluolsulfonsäure.The invention relates to the electrolytic coloring of anodically produced surfaces of aluminum and / or aluminum alloys in aqueous electrolytes containing silver salt by means of alternating current and using p-toluenesulfonic acid.
Aus S. Wernick, R. Pinner, P. Sheasby, "The Surface Treatment and Finishing of Aluminum and its Alloys", 5. Auflage (1987), S. 611, Finishing Publications Ltd., Paddington-Middlesex, Großbritannien, ist prinzipiell die elektrolytische Färbung in silbersalzhaltigen Elektrolyten bekannt. Jedoch werden hierbei üblicherweise nur grünlich-goldene Färbungen erzielt, die insbesondere bei der Verwendung im Architekturbereich wenig Akzeptanz finden.From S. Wernick, R. Pinner, P. Sheasby, "The Surface Treatment and Finishing of Aluminum and its Alloys", 5th edition (1987), p. 611, Finishing Publications Ltd., Paddington-Middlesex, Great Britain the electrolytic coloring in electrolytes containing silver salt is known. However, only greenish-gold colorations are usually achieved here, which find little acceptance particularly when used in the architectural field.
Aus Chemical Abstracts 105 (10), Referat 87 431z, ist die elektrolytische Färbung von Aluminium unter Verwendung eines Elektrolyten, enthaltend Silbernitrat und Schwefelsäure, bekannt. Das Färbeverfahren wurde angewendet für die Oberflächenbehandlung von Lampen und Aluminiumwerkstücken. Es wird beschrieben, daß die Probleme, die üblicherweise durch Färbung mit organischen Farbstoffen entstehen, gelöst werden.Chemical Abstracts 105 (10), Unit 87 431z, discloses the electrolytic coloring of aluminum using an electrolyte containing silver nitrate and sulfuric acid. The coloring process was used for the surface treatment of lamps and aluminum workpieces. It is described that the problems that usually arise from dyeing with organic dyes are solved.
In Chemical Abstracts 93 (20), Referat 194 174y, wird die Färbung von anodisch erzeugtem Aluminium mit Molybdatlösungen beschrieben. Untersuchungen wurden durchgeführt, um blaue und grün gefärbte, anodisch erzeugte Aluminiumoberflächen in einem mehrstufigen Verfahren zu erhalten. Es wurden verschiedene Lösungen, enthaltend (NH₄)₆Mo₄O₂₄ x 4 H₂O, SnSO₄, C₇H₈O₄S und H₂SO₄, allein oder in Kombination mit Silbernitratlösungen verwendet. Hierbei handelt es sich um ein mehrstufiges Verfahren, wobei die Elektrolytlösungen Kombinationen der angeführten Salze enthalten.Chemical Abstracts 93 (20), Section 194 174y, describes the coloring of anodically produced aluminum with molybdate solutions. Studies have been done to blue and obtain green colored, anodized aluminum surfaces in a multi-stage process. Various solutions containing (NH₄) ₆Mo₄O₂₄ x 4 H₂O, SnSO₄, C₇H₈O₄S and H₂SO₄ were used alone or in combination with silver nitrate solutions. This is a multi-stage process, the electrolyte solutions containing combinations of the salts mentioned.
Aus JP-A 55-131195 ist die elektrolytische Färbung von Aluminium mit einer Reihe von Metallsalzen beschrieben. Im elektrolytischen Färbebad wird nach der anodischen Oxidation durch Wechselstromelektrolyse in einem Bad, enthaltend eine Hydroxyalkanolsulfonsäure der allgemeinen Formel HO-R-SO₃H, die genannte elektrolytische Färbung durchgeführt.JP-A 55-131195 describes the electrolytic coloring of aluminum with a number of metal salts. In the electrolytic dye bath after the anodic oxidation by AC electrolysis in a bath containing a hydroxyalkanolsulfonic acid of the general formula HO-R-SO₃H, said electrolytic coloring is carried out.
In Metal Finishing Abstracts, Vol 23 (1981), Nr. 1, Seite 25 F (Referat der JP-A-55 028 324) wird ferner ein Verfahren zum elektrolytischen Färben von anodisiertem Aluminium beschrieben, bei welchem ein Elektrolysebad, das Salze von Nickel, Kobalt, Zinn oder Kupfer in Form von Sulfat, Sulphamat, Oxalat, Tartrat oder Phosphat enthält, Verwendung findet. Das Bad enthält außerdem 5 bis 100 g/l p-Toluolsulfonat-Natriumsalz oder ähnliche Verbindungen sowie ungesättigte Verbindungen, beispielsweise Formaldehyd, Benzylidenaceton, Pyridin, Chinolin, Butindiol, Ethylencyanhydrin, Thioharnstoff oder Azofarbstoffe.Metal Finishing Abstracts, Vol 23 (1981), No. 1, page 25 F (unit of JP-A-55 028 324) also describes a process for the electrolytic coloring of anodized aluminum, in which an electrolysis bath, the salts of nickel Contains cobalt, tin or copper in the form of sulfate, sulphamate, oxalate, tartrate or phosphate. The bath also contains 5 to 100 g / l p-toluenesulfonate sodium salt or similar compounds and unsaturated compounds, for example formaldehyde, benzylidene acetone, pyridine, quinoline, butynediol, ethylene cyanohydrin, thiourea or azo dyes.
Auch in Chemical Abstracts, Vol 105 (1986), Nr. 12, Seite 490, Abstract Nr. 105: 104 751y (Referat der JP-A-61 99 697) wird ein Verfahren zum elektrolytischen Färben von anodisiertem Aluminium beschrieben, wobei das Färbeband ein Silbersalz enthält, beispielsweise 0,5 g/l Silbersulfat sowie 1 g/l Zinnsulfat, 20 g/l Sulfosalicylsäure, 20 g/l Magnesiumsulfat und 10 g/l Schwefelsäure. Anschließend wird das so behandelte Aluminium in ein saures Bad, enthaltend beispielsweise Schwefelsäure oder Salpetersäure, oder in ein neutrales Bad, enthaltend beispielsweise Thiosulfat oder Thiogluconat, getaucht. Es resultieren dauerhafte und hell gefärbte Schichten, beispielsweise hell-orange gefärbte Schichten.Chemical Abstracts, Vol 105 (1986), No. 12, page 490, Abstract No. 105: 104 751y (unit of JP-A-61 99 697) also describes a process for the electrolytic coloring of anodized aluminum, the coloring tape contains a silver salt, for example 0.5 g / l silver sulfate and 1 g / l tin sulfate, 20 g / l sulfosalicylic acid, 20 g / l magnesium sulfate and 10 g / l sulfuric acid. The aluminum treated in this way is then immersed in an acidic bath containing, for example, sulfuric acid or nitric acid, or in a neutral bath containing, for example, thiosulfate or thiogluconate. This results in permanent and light-colored layers, for example light-orange colored layers.
Überraschenderweise wurde gefunden, daß mit einem Zusatz von p-Toluolsulfonsäure zu silbersalzhaltigen Elektrolytbädern ein warmer brillanter und vor allem lichtbeständiger Goldton ohne sichtbaren Grünstich bei der Färbung von anodisch erzeugten Oberflächen von Aluminium und/oder Aluminiumlegierungen mittels Wechselstrom erzielt werden kann. Bei längerer Färbung entsteht ein rötlich-brauner, sehr dekorativer Farbton.Surprisingly, it was found that the addition of p-toluenesulfonic acid to the electrolyte baths containing silver salt enables a warm, brilliant and, above all, light-resistant gold tone to be achieved without a visible green tint in the coloring of anodically produced surfaces of aluminum and / or aluminum alloys by means of alternating current. With longer coloring, a reddish-brown, very decorative hue is created.
Die Erfindung betrifft somit die Verwendung von p-Toluolsulfonsäure und/oder deren wasserlöslichen Alkalimetall-, Ammonium- und/oder Erdalkalimetallsalzen zur elektrolytischen Färbung anodisch erzeugter Oberflächen von Aluminium und/oder Aluminiumlegierungen, welche dadurch gekennzeichnet ist, daß man wäßrige Elektrolytlösungen einsetzt, die 0,1 bis 10 g/l Silber in Form von wasserlöslichen Salzen enthalten, und Wechselstrom oder gleichstromüberlagerten Wechselstrom anwendet.The invention thus relates to the use of p-toluenesulfonic acid and / or its water-soluble alkali metal, ammonium and / or alkaline earth metal salts for the electrolytic coloring of anodized surfaces of aluminum and / or aluminum alloys, which is characterized in that aqueous electrolyte solutions are used, the 0 , Contain 1 to 10 g / l silver in the form of water-soluble salts, and apply alternating current or alternating current superimposed on direct current.
Gegenüber der adsorptiven Goldfärbung mittels Eisen(III)-oxalat und auch der elektrolytischen Färbung mit Kaliumpermanganat hat die erfindungsgemäße elektrolytische Färbung neben dem dekorativen Effekt den Vorteil, daß sie mit organischen Farbstoffen leicht und dauerhaft überfärbbar ist und so beispielsweise mit Farbstoffen wie SanodalblauR der Firma Sandoz AG, Basel, Schweiz, auch ein lichtechtes Grün als Kombinationsfärbung erzielt werden kann.Compared to the adsorptive gold coloring using iron (III) oxalate and also the electrolytic coloring using potassium permanganate, the electrolytic coloring according to the invention also has the decorative effect has the advantage that it can be easily and permanently over-dyed with organic dyes and so, for example, with dyes such as Sanodalblau R from Sandoz AG, Basel, Switzerland, a lightfast green can also be achieved as a combination dyeing.
Andere Sulfonsäuren zeigen bei Goldtönungen nicht den gewünschten Effekt der rötlich-gelben Färbung. Diese ergeben vielmehr im dekorativen Bereich weniger bevorzugte grünliche Goldtöne, wie die nachstehenden Vergleichsbeispiele 4 bis 7 zeigen.Other sulfonic acids do not show the desired effect of the reddish-yellow color in gold tints. Rather, these result in less preferred greenish gold tones in the decorative area, as the comparative examples 4 to 7 below show.
Die nachfolgende Verwendung des Begriffs "p-Toluolsulfonsäure" beinhaltet gleichermaßen auch deren wasserlösliche Alkalimetallsalze und/oder deren wasserlösliche Erdalkalimetallsalze. Üblicherweise wird wegen der besseren Wasserlöslichkeit p-Toluolsulfonsäure in Form des Monohydrats eingesetzt.The subsequent use of the term "p-toluenesulfonic acid" also includes their water-soluble alkali metal salts and / or their water-soluble alkaline earth metal salts. Usually p-toluenesulfonic acid is used in the form of the monohydrate because of its better solubility in water.
Gemäß einer Ausführungsform der vorliegenden Erfindung wird p-Toluolsulfonsäure in einer Menge von 3 bis 100 g/l Elektrolytlösung eingesetzt, während eine bevorzugte Ausführungsform der vorliegenden Erfindung in der Verwendung von 5 bis 25 g/l p-Toluolsulfonsäure besteht.According to one embodiment of the present invention, p-toluenesulfonic acid is used in an amount of 3 to 100 g / l electrolytic solution, while a preferred embodiment of the present invention consists in using 5 to 25 g / l p-toluenesulfonic acid.
Gemäß einer weiteren Ausführungsform der vorliegenden Erfindung enthält die Elektrolytlösung das Silber in Form von Nitrat, Acetat und/oder Sulfat. Bevorzugt im Sinne der vorliegenden Erfindung ist ferner, daß die Elektrolytlösung 0,3 bis 1,2 g/l Silber in Form wasserlöslicher Salze, vorzugsweise in Form von Nitrat, Acetat und/oder Sulfat, enthält. Bevorzugt ist die Verwendung von Silbersulfat.According to a further embodiment of the present invention, the electrolytic solution contains the silver in the form of nitrate, acetate and / or sulfate. For the purposes of the present invention, it is further preferred that the electrolyte solution contains 0.3 to 1.2 g / l of silver in the form of water-soluble salts, preferably in the form of nitrate, acetate and / or sulfate. The use of silver sulfate is preferred.
Eine weitere Ausführungsform der vorliegenden Erfindung besteht darin, daß die Elektrolytlösung gewünschtenfalls 2,5 bis 100 g/l Schwefelsäure und/oder deren Alkalimetall-, Ammonium- und/oder Erdalkalimetallsalze enthält. Eine besondere Ausführungsform der vorliegenden Erfindung besteht darin, daß eine Elektrolytlösung eingesetzt wird, die 2,5 bis 25 g/l Schwefelsäure enthält. Die anstelle der Schwefelsäure oder zusammen mit dieser verwendbaren Alkalimetall-, Ammonium- und/oder Erdalkalimetallsalze sind die des Natriums, Kaliums, Ammoniums, Magnesiums oder deren Gemische, vorzugsweise in Form der Sulfate und/oder der Acetate.A further embodiment of the present invention consists in that the electrolyte solution, if desired, 2.5 to 100 g / l sulfuric acid and / or its alkali metal, ammonium and / or contains alkaline earth metal salts. A particular embodiment of the present invention is that an electrolyte solution is used which contains 2.5 to 25 g / l sulfuric acid. The alkali metal, ammonium and / or alkaline earth metal salts which can be used instead of or together with this are those of sodium, potassium, ammonium, magnesium or mixtures thereof, preferably in the form of the sulfates and / or the acetates.
Insbesondere bevorzugt ist die Verwendung von Magnesiumsulfat zusammen mit oder anstelle der Schwefelsäure.The use of magnesium sulfate together with or instead of the sulfuric acid is particularly preferred.
Zur Erzielung der bestmöglichen Färbung wird erfindungsgemäß eine Klemmenspannung von 4 bis 20 V eingestellt. Eine bevorzugte Ausführungsform der vorliegenden Erfindung besteht darin, die Klemmenspannung im Bereich von 8 bis 16 V einzustellen. Es wird Wechselstrom oder ein mit Gleichstrom überlagerter Wechselstrom eingesetzt. Hierbei ist der "mit Gleichstrom überlagerte Wechselstrom" einem "mit Wechselstrom überlagertem Gleichstrom" gleichzusetzen. Als Klemmenspannung ist die am Bad anliegende Spannung definiert.To achieve the best possible coloring, a terminal voltage of 4 to 20 V is set according to the invention. A preferred embodiment of the present invention is to set the terminal voltage in the range from 8 to 16 V. Alternating current or alternating current superimposed with direct current is used. Here, the "alternating current superimposed with direct current" is equivalent to "direct current superimposed with alternating current". The voltage applied to the bath is defined as the terminal voltage.
Bevorzugt im Rahmen der Erfindung ist die Erzeugung von Goldtönen. Diese resultieren vorzugsweise in einem Spannungsbereich von 8 bis 16 V, wobei die Behandlungszeiten um so kürzer sein sollen, je höher die Spannung gewählt wird. In diesem Sinne liegen die Behandlungszeiten in der Regel im Bereich von 0,5 bis 3 min.The generation of gold tones is preferred within the scope of the invention. These preferably result in a voltage range of 8 to 16 V, the treatment times should be shorter the higher the voltage is selected. In this sense, the treatment times are usually in the range of 0.5 to 3 minutes.
Generell resultieren intensivere Färbungen, je länger die Behandlungsdauer (Färbezeit), je höher die Spannung und je höher die Silberkonzentrationen im Elektrolyten gewählt werden.In general, more intense colorations result, the longer the treatment time (coloring time), the higher the voltage and the higher the silver concentrations in the electrolyte.
In diesem Sinne resultieren Brauntöne bei Färbezeiten von mehr als 3 min und höheren Spannungswerten, d.h. insbesondere von mehr als 10 V.In this sense, brown tones result in dyeing times of more than 3 min and higher voltage values, i.e. especially more than 10 V.
Bei höheren Silberkonzentrationen, d.h. von 2 bis 10 g/l, resultieren tiefschwarze Färbungen.At higher silver concentrations, i.e. from 2 to 10 g / l, deep black colorations result.
Zu vermeiden sind generell Spannungswerte von mehr als 16 V bei Färbezeiten von mehr als 3 min, da sonst Abplatzungen der Oxidschicht auftreten können.Voltage values of more than 16 V should generally be avoided with dyeing times of more than 3 minutes, since otherwise the oxide layer may flake off.
Im Rahmen der Erfindung können auch Elektrolytlösungen Verwendung finden, die noch weitere Kationen enthalten. Als solche sind bevorzugt: Cu (II), Ni (II) und Co (II). Auf diese Weise resultiert eine breite Palette weiterer warmer Farbtöne.Electrolyte solutions which contain further cations can also be used within the scope of the invention. Preferred as such are: Cu (II), Ni (II) and Co (II). This results in a wide range of other warm colors.
Die nach der Verdichtung erreichten Lichtechtheiten der Oberflächen sind außerordentlich gut. Nach Wernick, Pinner, Zurbrügg, Weiner "Die Oberflächenbehandlung von Aluminium", 2. Auflage, Leuze Verlag, Saulgau/Württ. (1977) S. 364 f, werden in genormten Verfahren Lichtechtheiten im Bereich um den Wert 8 gefunden.The lightfastness of the surfaces achieved after compression is extremely good. After Wernick, Pinner, Zurbrügg, Weiner "The surface treatment of aluminum", 2nd edition, Leuze Verlag, Saulgau / Württ. (1977) p. 364 f, light fastness in the range around the value 8 is found in standardized processes.
Für die nachstehenden Beispiele und Vergleichsbeispiele wurden Probebleche (Dimension 50 mm x 40 mm x 1 mm) aus dem Werkstoff Almg₁ (DIN-Werkstoff-Nr. 3.3315) verwendet.For the following examples and comparative examples, test sheets (dimension 50 mm x 40 mm x 1 mm) made of the material Almg 1 (DIN material no. 3.3315) were used.
Vor dem Anodisieren wurden die Bleche nach herkömmlichen Verfahren entfettet, gebeizt und dekapiert. Die Entfettung erfolgte mit einem alkalischen Reiniger, enthaltend Borate, Carbonate, Phosphate und nichtionische Tenside (P3-almecoR18, Henkel KGaA, Düsseldorf), Badkonzentration 5 Gew.-% bei 70 °C im Verlauf von 15 min.Before anodizing, the sheets were degreased, pickled and pickled using conventional methods. The degreasing was carried out with an alkaline cleaner containing borates, carbonates, phosphates and nonionic surfactants (P3-almeco R 18, Henkel KGaA, Düsseldorf), bath concentration 5% by weight at 70 ° C. in the course of 15 minutes.
Zum Beizen wurde ein Gemisch (3 : 1) aus Natriumhydroxid und einem Beizmittel, enthaltend Alkali, Alkohole und Salze anorganischer Säuren (P3-almecoR46, Henkel KGaA, Düsseldorf), verwendet. Badkonzentration: 8 Gew.%, Temperatur: 65 °C, Tauchzeit: 12 min.For the pickling, a mixture (3: 1) of sodium hydroxide and a pickling agent containing alkali, alcohols and salts of inorganic acids (P3-almeco R 46, Henkel KGaA, Duesseldorf) was used. Bath concentration: 8% by weight, temperature: 65 ° C, immersion time: 12 min.
Das Dekapieren erfolgte mit einem sauren Dekapiermittel, enthaltend Salze anorganischer Säuren sowie anorganische Säuren (P3-almecoR90, Henkel KGaA, Düsseldorf), in einer Konzentration von 15 Gew.-%, bei einer Temperatur von 20 °C im Verlauf von 3 min.The pickling was carried out using an acidic pickling agent containing salts of inorganic acids and inorganic acids (P3-almeco R 90, Henkel KGaA, Düsseldorf), in a concentration of 15% by weight, at a temperature of 20 ° C. in the course of 3 minutes .
Nach jedem der vorgenannten Verfahrensschritte wurden die Bleche mit entionisiertem Wasser gründlich gespült.After each of the above process steps, the sheets were rinsed thoroughly with deionized water.
Die anschließende Anodisierung wurde nach dem Gleichstrom-Schwefelsäure-Verfahren vorgenommen; Badzusammensetzung: 180 g/l Schwefelsäure, 10 g/l Aluminium, Lufteinblasung: 8 m³/m²h, Temperatur: 20 °C, Gleichspannung 15 V, Stromdichte 1,4 A/dm², Anodisierungsdauer: 2700 bis 3600 sec, je nach den Erfordernissen zur Herstellung einer konstanten Oxidschicht von 20 µm.The subsequent anodization was carried out using the direct current sulfuric acid method; Bath composition: 180 g / l sulfuric acid, 10 g / l aluminum, air injection: 8 m³ / m²h, temperature: 20 ° C, DC voltage 15 V, current density 1.4 A / dm², anodizing time: 2700 to 3600 sec, depending on the requirements for the production of a constant oxide layer of 20 µm.
Nach erneutem gründlichen Spülen mit entionisiertem Wasser erfolgte nun die erfindungsgemäße Färbebehandlung wie in den Beispielen und Vergleichsbeispielen ausgeführt.After thorough rinsing again with deionized water, the dyeing treatment according to the invention was carried out as described in the examples and comparative examples.
Anschließend wurden die Bleche wiederum gespült und einem Verdichtungsverfahren unterworfen. Bei einer Temperatur von etwa 98 °C wurde im Verlauf von 60 min. (entsprechend 3 min./µm) die Verdichtung vorgenommen. Als Additiv wurde ein Sealingbelagverhinderer auf Basis von Polycarbonsäuren und Ammoniumacetat als Puffersubstanz (P3-almecoR seal SL, Henkel KGaA, Düsseldorf) verwendet.The sheets were then rinsed again and subjected to a compression process. At a temperature of about 98 ° C in the course of 60 min. (corresponding to 3 min./µm) the compression. As an additive, a sealing coating inhibitor based on polycarboxylic acids and ammonium acetate was used as a buffer substance (P3-almeco R seal SL, Henkel KGaA, Düsseldorf).
Unter Verwendung eines Elektrolyten, enthaltend 1 g/l Silbersulfat und 20 g/l Schwefelsäure wurde im Verlauf von 1 min bei einer Klemmenspannung von 16 V unter Zusatz von 20 g/l p-Toluolsulfonsäure eine rötlich-goldgelbe Oberflächenfärbung der obengenannten Aluminiumbleche erzielt.Using an electrolyte containing 1 g / l of silver sulfate and 20 g / l of sulfuric acid, a reddish-gold-yellow surface coloring of the above-mentioned aluminum sheets was achieved in the course of 1 min at a terminal voltage of 16 V with the addition of 20 g / l of p-toluenesulfonic acid.
Unter Verwendung des gleichen Elektrolyten wie in Beispiel 1, jedoch ohne Verwendung von p-Toluolsulfonsäure wurde unter gleichen Elektrolysebedingungen ein Olivgrünlich-Gelbton des Aluminiumbleches erreicht.Using the same electrolyte as in Example 1, but without using p-toluenesulfonic acid, an olive greenish-yellow tone of the aluminum sheet was achieved under the same electrolysis conditions.
Unter Verwendung eines Elektrolyten, enthaltend 1 g/l Silbersulfat und 20 g/l Schwefelsäure wurde bei einer Klemmenspannung von 14 V im Verlauf von 8 min unter Verwendung von 20 g/l p-Toluolsulfonsäure eine rötlich-braune Oberflächenfarbung erreicht.Using an electrolyte containing 1 g / l silver sulfate and 20 g / l sulfuric acid, a reddish-brown surface color was achieved at a terminal voltage of 14 V over the course of 8 minutes using 20 g / l p-toluenesulfonic acid.
Unter Verwendung eines Elektrolyten gemäß Beispiel 2, jedoch ohne Verwendung von p-Toluolsulfonsäure wurde bei gleichen Elektrolysebedingungen eine olivbraune Oberflächenfärbung der obengenannten Aluminiumbleche erreicht.Using an electrolyte according to Example 2, but without using p-toluenesulfonic acid, an olive-brown surface coloring of the above-mentioned aluminum sheets was achieved under the same electrolysis conditions.
Unter Verwendung eines Elektrolyten, enthaltend 1 g/l Silbernitrat und 20 g/l Schwefelsäure wurde im Verlauf von 4 min bei einer Klemmenspannung von 12 V unter Verwendung von 15 g/l p-Toluolsulfonsäure eine bronzebraune Oberflächenfärbung der obengenannten Aluminiumbleche erreicht.Using an electrolyte containing 1 g / l silver nitrate and 20 g / l sulfuric acid, a bronze-brown surface coloring of the above-mentioned aluminum sheets was achieved in the course of 4 min at a terminal voltage of 12 V using 15 g / l p-toluenesulfonic acid.
Unter Verwendung eines Elektrolyten gemäß Beispiel 3 wurde bei gleichen Elektrolysebedingungen ohne Verwendung von p-Toluolsulfonsäure eine hellolivbraune Färbung erreicht.Using an electrolyte according to Example 3, a light olive-brown color was achieved under the same electrolysis conditions without using p-toluenesulfonic acid.
Eine nachträgliche Überfärbung vor der Sealingbehandlung der oben erhaltenen goldfarbenen Bleche mit SanodalblauR der Firma Sandoz AG, Basel, Schweiz, in einer Konzentration von 5 g/l, pH 5,5, ergab im Verlauf von 20 min bei 60 °C eine Grünfärbung, die außerordentlich lichtbeständig war.Subsequent over-dyeing before the sealing treatment of the gold-colored sheets obtained above with Sanodalblau R from Sandoz AG, Basel, Switzerland, in a concentration of 5 g / l, pH 5.5, gave a green color over the course of 20 min at 60 ° C. which was extremely lightfast.
Unter Verwendung eines Elektrolyten, enthaltend 1 g/l Silbersulfat und 5 g/l Schwefelsäure wurde im Verlauf von 1 min bei einer Klemmenspannung von 16 V unter Zusatz von 20 g p-Toluolsulfonsäure eine rötlich-goldene Oberflächenfärbung der obengenannten Aluminiumbleche erzielt.Using an electrolyte containing 1 g / l of silver sulfate and 5 g / l of sulfuric acid, was added in the course of 1 min a terminal voltage of 16 V with the addition of 20 g of p-toluenesulfonic acid achieved a reddish-gold surface coloring of the above-mentioned aluminum sheets.
Unter Verwendung eines Elektrolyten, enthaltend 1 g/l Silbersulfat und 5 g/l Schwefelsäure wurde im Verlauf von 1 min bei einer Klemmenspannung von 16 V unter Zusatz von 20 g/l Methansulfonsäure eine grünlich-gelb-goldene Oberflächenfärbung der obengenannten Aluminiumbleche erzielt.Using an electrolyte containing 1 g / l silver sulfate and 5 g / l sulfuric acid, a greenish-yellow-gold surface coloring of the above-mentioned aluminum sheets was achieved in the course of 1 min at a terminal voltage of 16 V with the addition of 20 g / l methanesulfonic acid.
Unter Verwendung eines Elektrolyten, enthaltend 1 g/l Silbersulfat und 5 g/l Schwefelsäure wurde im Verlauf von 1 min bei einer Klemmenspannung von 16 V unter Zusatz von 20 g/l Naphthalin-2-sulfonsäure eine grünlich-gelb-goldene Oberflächenfärbung der obengenannten Aluminiumbleche erzielt.Using an electrolyte containing 1 g / l of silver sulfate and 5 g / l of sulfuric acid, a greenish-yellow-gold surface color of the above was obtained in the course of 1 min at a terminal voltage of 16 V with the addition of 20 g / l of naphthalene-2-sulfonic acid Aluminum sheets achieved.
Unter Verwendung eines Elektrolyten, enthaltend 1 g/l Silbersulfat und 5 g/l Schwefelsäure wurde im Verlauf von 1 min bei einer Klemmenspannung von 16 V unter Zusatz von 20 g/l Benzolsulfonsäure eine grünlich-gelb-goldene Oberflächenfärbung der obengennannten Aluminiumbleche erzielt.Using an electrolyte containing 1 g / l silver sulfate and 5 g / l sulfuric acid, a greenish-yellow-gold surface coloring of the above-mentioned aluminum sheets was achieved in the course of 1 min at a terminal voltage of 16 V with the addition of 20 g / l benzenesulfonic acid.
Unter Verwendung eines Elektrolyten, enthaltend 1 g/l Silbersulfat und 5 g/l Schwefelsaüre wurde im Verlauf von 1 min bei einer Klemmenspannung von 16 V unter Zusatz von 20 g/l Butansulfonsäure eine grünlich-gelb-goldene Oberflächenfärbung der obengenannten Aluminiumbleche erzielt.Using an electrolyte containing 1 g / l of silver sulfate and 5 g / l of sulfuric acid, was carried out over a period of 1 min at a terminal voltage of 16 V with the addition of 20 g / l of butanesulfonic acid achieved a greenish-yellow-gold surface coloring of the above-mentioned aluminum sheets.
Unter Verwendung eines Elektrolyten, enthaltend 0,5 g/l Silbersulfat und 20 g/l Schwefelsäure wurde im Verlauf von 1 min unter Zusatz von 20 g/l p-Toluolsulfonsäure bei einer Klemmenspannung von 16 V eine rötlich-gelb-goldene Oberflächenfärbung der obengenannten Aluminiumbleche erzielt.Using an electrolyte containing 0.5 g / l of silver sulfate and 20 g / l of sulfuric acid, a reddish-yellow-gold surface color of the above was obtained in the course of 1 min with the addition of 20 g / l of p-toluenesulfonic acid at a terminal voltage of 16 V. Aluminum sheets achieved.
Unter Verwendung eines Elektrolyten, enthaltend 0,5 g/l Silbersulfat und 15 g/l Magnesiumsulfat (in Form von MgSO₄ . 7H₂O) wurde im Verlauf von 2 min bei einer Klemmenspannung von 14 V unter Zusatz von 20 g/l p-Toluolsulfonsäure eine rötlich-gelb-goldene Oberflächenfärbung der obengenannten Aluminiumbleche erzielt.Using an electrolyte containing 0.5 g / l of silver sulfate and 15 g / l of magnesium sulfate (in the form of MgSO₄. 7H₂O) one was in the course of 2 min at a terminal voltage of 14 V with the addition of 20 g / l of p-toluenesulfonic acid reddish-yellow-gold surface coloring of the above aluminum sheets achieved.
Claims (11)
- The use of p-toluenesulfonic acid and/or water-soluble alkali metal, ammonium and/or alkaline earth metal salts thereof for the electrolytic colouring of anodically produced surfaces of aluminium and/or aluminium alloys, characterized in that aqueous electrolyte solutions containing 0.1 to 10 g/l silver in the form of water-soluble salts are used and alternating current or alternating current superimposed on direct current is applied.
- The use claimed in claim 1, characterized in that p-toluene sulfonic acid and/or water-soluble alkali metal, ammonium and/or alkaline earth metal salts thereof are used in a quantity of 3 to 100 g/l electrolyte solution.
- The use claimed in claim 2, characterized in that p-toluenesulfonic acid and/or water-soluble alkali metal, ammonium and/or alkaline earth metal salts thereof are used in a quantity of 5 to 25 g/l electrolyte solution.
- The use claimed in claims 1 to 3, characterized in that electrolyte solutions containing silver in the form of nitrate, acetate and/or sulfate are used.
- The use claimed in claims 1 to 3, characterized in that electrolyte solutions containing 0.3 to 1.2 g/l silver in the form of water-soluble salts, preferably in the form of nitrate, acetate and/or sulfate, are used.
- The use claimed in claims 1 to 5, characterized in that electrolyte solutions containing 2.5 to 100 g/l sulfuric acid and/or alkali metal, ammonium and/or alkaline earth metal salts thereof are used.
- The use claimed in claim 6, characterized in that electrolyte solutions containing 2.5 to 25 g/l sulfuric acid and/or alkali metal, ammonium and/or alkaline earth metal salts thereof are used.
- The use claimed in claims 1 to 7, characterized in that the sulfates of sodium, potassium, magnesium, ammonium and/or their acetates and mixtures thereof are used as the alkali metal, ammonium and/or alkaline earth metal salts.
- The use claimed in claims 1 to 8, characterized in that the electrolyte solutions contain other transition metal cations, preferably Cu(II), Ni(II) and Co(II).
- The use claimed in claims 1 to 9, characterized in that a voltage of 4 to 20 V is adjusted at the terminals.
- The use claimed in claim 10, characterized in that a voltage of 8 to 16 V is adjusted at the terminals.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89112555T ATE82022T1 (en) | 1988-07-19 | 1989-07-10 | USE OF P-TOLUENE SULFONIC ACID FOR THE ELECTROLYTIC COLORING OF ANODICALLY PRODUCED ALUMINUM SURFACES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3824402 | 1988-07-19 | ||
DE3824402A DE3824402A1 (en) | 1988-07-19 | 1988-07-19 | USE OF P-TOLUOLSULPHONIC ACID FOR ELECTROLYTICALLY COLORING ANODICALLY PRODUCED SURFACES OF ALUMINUM |
Publications (2)
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EP0351680A1 EP0351680A1 (en) | 1990-01-24 |
EP0351680B1 true EP0351680B1 (en) | 1992-11-04 |
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EP89112555A Expired - Lifetime EP0351680B1 (en) | 1988-07-19 | 1989-07-10 | Use of p-toluene sulfonic acid in the electrolytic colouring of anodically obtained aluminium surfaces |
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US (1) | US4917780A (en) |
EP (1) | EP0351680B1 (en) |
JP (1) | JPH0273993A (en) |
KR (1) | KR900001886A (en) |
AT (1) | ATE82022T1 (en) |
AU (1) | AU609320B2 (en) |
BR (1) | BR8903540A (en) |
DE (2) | DE3824402A1 (en) |
ES (1) | ES2035994T3 (en) |
GR (1) | GR3006151T3 (en) |
NZ (1) | NZ229977A (en) |
ZA (1) | ZA895471B (en) |
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DE4244021A1 (en) * | 1992-12-24 | 1994-06-30 | Henkel Kgaa | Process for the electrolytic alternating current coloring of aluminum surfaces |
DE10033434A1 (en) | 2000-07-10 | 2002-01-24 | Basf Ag | Process for the production of gold-colored surfaces of aluminum or aluminum alloys using formulations containing silver salt |
CN102808208B (en) * | 2012-08-29 | 2013-07-24 | 广东豪美铝业股份有限公司 | Method for putting gold color on aluminum material |
KR101890681B1 (en) | 2016-12-27 | 2018-09-28 | 엘에스산전 주식회사 | Position indicator of air circuit breaker |
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JPS5249408B2 (en) * | 1972-11-21 | 1977-12-17 | ||
JPS547267B2 (en) * | 1973-09-21 | 1979-04-05 | ||
US4128460A (en) * | 1976-09-13 | 1978-12-05 | Daiwa Kasei Kenkyujo Kabushiki Kaisha | Coloring by electrolysis of aluminum or aluminum alloys |
FR2380357A1 (en) * | 1977-02-11 | 1978-09-08 | Pechiney Aluminium | PROCESS FOR ELECTROLYTIC COLORING OF ALUMINUM AND ITS NON-ANODIZED ALLOYS |
US4226680A (en) * | 1977-06-06 | 1980-10-07 | Alcan Research And Development Limited | Process for electrolytic coloration of anodized aluminium |
JPS55131195A (en) * | 1979-03-30 | 1980-10-11 | Sumitomo Light Metal Ind Ltd | Electrolytic coloring method for aluminum |
US4430169A (en) * | 1982-03-04 | 1984-02-07 | Woods Jack L | Method of producing green coatings on aluminum and aluminum alloys |
-
1988
- 1988-07-19 DE DE3824402A patent/DE3824402A1/en not_active Withdrawn
-
1989
- 1989-07-10 ES ES198989112555T patent/ES2035994T3/en not_active Expired - Lifetime
- 1989-07-10 AT AT89112555T patent/ATE82022T1/en not_active IP Right Cessation
- 1989-07-10 DE DE8989112555T patent/DE58902601D1/en not_active Expired - Fee Related
- 1989-07-10 EP EP89112555A patent/EP0351680B1/en not_active Expired - Lifetime
- 1989-07-18 BR BR898903540A patent/BR8903540A/en unknown
- 1989-07-18 ZA ZA895471A patent/ZA895471B/en unknown
- 1989-07-18 NZ NZ229977A patent/NZ229977A/en unknown
- 1989-07-18 AU AU38244/89A patent/AU609320B2/en not_active Ceased
- 1989-07-18 KR KR1019890010185A patent/KR900001886A/en not_active Application Discontinuation
- 1989-07-19 JP JP1187235A patent/JPH0273993A/en active Pending
- 1989-07-19 US US07/382,611 patent/US4917780A/en not_active Expired - Fee Related
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AU609320B2 (en) | 1991-04-26 |
US4917780A (en) | 1990-04-17 |
KR900001886A (en) | 1990-02-27 |
JPH0273993A (en) | 1990-03-13 |
DE3824402A1 (en) | 1990-01-25 |
EP0351680A1 (en) | 1990-01-24 |
AU3824489A (en) | 1990-01-25 |
GR3006151T3 (en) | 1993-06-21 |
ZA895471B (en) | 1990-03-28 |
DE58902601D1 (en) | 1992-12-10 |
BR8903540A (en) | 1990-03-13 |
ATE82022T1 (en) | 1992-11-15 |
ES2035994T3 (en) | 1993-05-01 |
NZ229977A (en) | 1990-08-28 |
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