EP0157190B1 - Etching process for aluminium - Google Patents
Etching process for aluminium Download PDFInfo
- Publication number
- EP0157190B1 EP0157190B1 EP19850102400 EP85102400A EP0157190B1 EP 0157190 B1 EP0157190 B1 EP 0157190B1 EP 19850102400 EP19850102400 EP 19850102400 EP 85102400 A EP85102400 A EP 85102400A EP 0157190 B1 EP0157190 B1 EP 0157190B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- bath
- pickling
- aluminium
- pickling bath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 22
- 229910052782 aluminium Inorganic materials 0.000 title claims description 22
- 238000000034 method Methods 0.000 title claims description 20
- 239000004411 aluminium Substances 0.000 title claims 4
- 238000005530 etching Methods 0.000 title description 3
- 238000005554 pickling Methods 0.000 claims description 44
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 18
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 13
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 4
- 235000011118 potassium hydroxide Nutrition 0.000 claims description 4
- 239000008237 rinsing water Substances 0.000 claims description 4
- 239000000176 sodium gluconate Substances 0.000 claims description 4
- 235000012207 sodium gluconate Nutrition 0.000 claims description 4
- 229940005574 sodium gluconate Drugs 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 150000001447 alkali salts Chemical class 0.000 claims description 3
- 239000008139 complexing agent Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 239000000706 filtrate Substances 0.000 claims description 2
- 230000008929 regeneration Effects 0.000 claims description 2
- 238000011069 regeneration method Methods 0.000 claims description 2
- 150000004763 sulfides Chemical class 0.000 claims description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 2
- 150000004764 thiosulfuric acid derivatives Chemical class 0.000 claims description 2
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims 6
- 230000004075 alteration Effects 0.000 claims 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims 1
- 238000011065 in-situ storage Methods 0.000 claims 1
- 235000021317 phosphate Nutrition 0.000 claims 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims 1
- 239000000243 solution Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 4
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 3
- 229910001388 sodium aluminate Inorganic materials 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- -1 anodizing Chemical compound 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000002054 inoculum Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
Classifications
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/32—Alkaline compositions
- C23F1/36—Alkaline compositions for etching aluminium or alloys thereof
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/46—Regeneration of etching compositions
-
- 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
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
-
- 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
- C23G1/36—Regeneration of waste pickling liquors
Definitions
- the low concentration of the pickling bath in dissolved substances also helps to keep the chemical loss caused by entrainment at a low level. The loss decreases even further if the pickled pieces are drained properly and the rinsing water is recycled.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
Die Erfindung betrifft ein Beizverfahren für Aluminium in einem Alkalilaugebad.The invention relates to a pickling process for aluminum in an alkali bath.
Die meisten Oberflächenveredelungsverfahren für Aluminium, z.B. die Eloxierung, setzen ein chemisches Beizen des Metalls voraus. Zur Durchführung des Beizens werden die entfetteten Aluminiumstücke z.B. in ein Natronlaugebad bei 50°C bis 70°C während 5 bis 15 Minuten getaucht. Dabei löst sich das Metall unter Bildung von Natriumaluminat und Wasserstoff auf nach der Gleichung:
Die Badkonzentration an Natriumaluminat nimmt dabei zu, die Natronlauge und die entsprechende Beizkraft nehmen ab.The bath concentration of sodium aluminate increases, the sodium hydroxide solution and the corresponding pickling power decrease.
Die Badaktivität kann durch periodische Zugabe von zusätzlicher Natronlauge aufrechterhalten werden. Um die Bildung von festen anhaftenden Krusten von Aluminiumhydroxid zu vermeiden, wird ein Komplexbildner zugegeben.The bath activity can be maintained by periodically adding additional sodium hydroxide solution. A complexing agent is added to avoid the formation of solid adherent crusts from aluminum hydroxide.
Normalerweise ist eine mit 70 g/I Aluminium beladenes Bad abgenützt und muß durch eine frisches Bad ersetzt werden. Dieser Ersatz ist kostspielig und stellt ein Abwasserproblem dar, dessen Lösung erhebliche Kosten verursachen kann. Die stets sich verändernde Badzusammensetzung und aktivität führen außerdem zu einer unregelmäßigen Qualität der gebeizten Aluminiumstücke.A bath loaded with 70 g / l aluminum is normally worn out and must be replaced by a fresh bath. This replacement is costly and is a wastewater problem, the solution of which can be costly. The constantly changing bath composition and activity also lead to an irregular quality of the pickled aluminum pieces.
Die periodische Beseitigung der abgenützten Beizbäder kann vermieden werden, indem man die Konzentration an gelöstem Aluminium bis auf etwa 110 g/I steigen läßt. Bei dieser Konzentration enthält die mit den behandelten Stücken mitgeschleppte Badflüssigkeit so viel gelöstes Aluminium wie durch Beizen der entsprechenden Stücke im Bad entstanden ist. Ein stationärer Zustand wird erreicht; der Natronlauge- und Komplexbildnerverbrauch muß durch Zugabe entsprechender frischer Chemikalien ergänzt werden; die Gesamtmenge an gelöstem Aluminium gelangt mit dem Spülwasser in das Abwasser und muß aus einer verdünnten Lösung entfernt werden. Die praktisch konstante Beizbad-Zusammensetzung sorgt zwar für eine konstante Qualität der behandelten Stücke, die hohe Salzkonzentration führt aber oft zu Fleckenbildung auf den gebeizten Stücken während ihres Transports vom Beiz- zum Spülbad (vgl. J. H. Dailey, Plating and surfaces finishing, July 1982 S 22 und 45.The periodic removal of the worn pickling baths can be avoided by letting the concentration of dissolved aluminum rise to about 110 g / l. At this concentration, the bath liquid carried along with the treated pieces contains as much dissolved aluminum as was produced by pickling the corresponding pieces in the bath. A steady state is reached; the sodium hydroxide and complexing agent consumption must be supplemented by adding appropriate fresh chemicals; the total amount of dissolved aluminum gets into the wastewater with the rinse water and must be removed from a dilute solution. The practically constant pickling bath composition ensures a constant quality of the treated pieces, but the high salt concentration often leads to the formation of stains on the pickled pieces during their transport from the pickling to the rinsing bath (cf.JH Dailey, Plating and surfaces finishing, July 1982 p 22 and 45.
Ein weiterer Weg, das Problem der abgenützten Beizbäder zu lösen, besteht darin, einen Teil des Beizbades in einen separaten Behälter zu überführen und dort durch Temperaturänderung und Zugabe von beträchtlichen Mengen an Aluminiumhydroxid als Impfkeime die Fällung des Aluminiumhydroxids aus der Natronlaugelösung zu bewirken nach der Gleichung:
Aus der EP-A-O 143 715 ist ein Beizbad bekannt, das neben NaOH oder KOH zwingend eine Komponente enthält, die ausgewählt ist aus Sulfiden, Thiosulfaten und/oder Sulfaten.EP-A-O 143 715 discloses a pickling bath which, in addition to NaOH or KOH, contains a component which is selected from sulfides, thiosulfates and / or sulfates.
Aus der DE-A-24 39 202 ist ein alkalisches Bad zum Ätzen von Aluminium und Aluminiumlegierungen bekannt, das neben Ätznatron und/oder Ätzkali und/oder weiteren für Beizbäder üblichen Zusätzen zwingend Polyhydroxycarboxylate enthält.From DE-A-24 39 202 an alkaline bath for the etching of aluminum and aluminum alloys is known which, in addition to caustic soda and / or caustic potash and / or other additives customary for pickling baths, contains polyhydroxycarboxylates.
In der DE-B-1 073 272 wird eine wäßrige Lösung zum Ätzen von Aluminium und seinen Legierungen beschrieben, die neben einem Alkalihydroxid und Weinsäure zwingend ein lösliches Phosphat enthält.DE-B-1 073 272 describes an aqueous solution for etching aluminum and its alloys, which in addition to an alkali hydroxide and tartaric acid necessarily contains a soluble phosphate.
Aufgabe der vorliegenden Erfindung war die Bereitstellung eines Beizverfahrens für Aluminium, das die vorstehend aufgezeigten Nachteile weitestgehend vermeidet und auf einfache und wirtschaftliche Weise zu einem gebeizten Aluminium von möglichst gleichbleibender Qualität führt.The object of the present invention was to provide a pickling process for aluminum, which largely avoids the disadvantages indicated above and leads in a simple and economical manner to a pickled aluminum of as constant a quality as possible.
Diese Aufgabe wird mit der vorliegenden Erfindung gelöst.This object is achieved with the present invention.
Gegenstand der Erfindung ist ein Beizverfahren für Aluminium in einem Alkalilaugebad gemäß Patentanspruch 1.The invention relates to a pickling process for aluminum in an alkali bath according to claim 1.
Zweckmäßigerweise wird mit einem verdünnten Beizbad gearbeitet, und vorzugsweise enthält das erfindungsgemaß eingesetzte Beizbad 1 bis wenigen als 10 g/I und insbesondere 3 bis 6 g/I Natron- oder Kalilauge; die Konzentration an gelöstem Aluminium liegt bevorzugt bei 2 bis 20 g/I, insbesondere 2 bis 15 g/I, besonders bevorzugt bei 4 bis 8 g/I. Diese geringen Alkalikonzentrationen ermöglichen die Ausfällung eines leicht filtrierbaren Aluminiumhydroxids und eine leichte Laugenregeneration direkt im Beizbad.It is expedient to work with a dilute pickling bath, and the pickling bath used according to the invention preferably contains 1 to a few than 10 g / l and in particular 3 to 6 g / l of sodium or potassium hydroxide solution; the concentration of dissolved aluminum is preferably 2 to 20 g / l, in particular 2 to 15 g / l, particularly preferably 4 to 8 g / l. These low alkali concentrations enable the precipitation of an easily filterable aluminum hydroxide and an easy regeneration of the alkali directly in the pickling bath.
Die geringe Konzentration des Beizbades an gelösten Stoffen trägt außerdem dazu bei, den durch Mitschleppen verursachten Chemikalienverlust auf einem geringen Wert zu halten. Der Verlust nimmt noch weiter ab, wenn man die gebeizten Stücke richtig abtropfen laßt und das Spülwasser rezyklisiert.The low concentration of the pickling bath in dissolved substances also helps to keep the chemical loss caused by entrainment at a low level. The loss decreases even further if the pickled pieces are drained properly and the rinsing water is recycled.
Die Temperatur des Beizbades liegt vorzugsweise zwischen 50 und 75°C.The temperature of the pickling bath is preferably between 50 and 75 ° C.
Die Konzentration an gelösten Stoffen bleibt während des Beizens des Aluminiums im wesentlichen konstant, weil das Aluminiumhydroxid laufend ausfällt, und soll vorzugsweise in dem oben als bevorzugt angegebenen Konzentrationsbereich liegen. Dies ermöglicht eine regelmäßige Beizgeschwindigkeit von 3 bis 7 g Aluminium pro m2 und Minute bei einer Badtemperatur von 50 bis 75°C. Die Qualität der behandelten Stücke ist gleichbleibend gut.The concentration of dissolved substances remains essentially constant during the pickling of the aluminum, because the aluminum hydroxide continuously fails, and should preferably be in the concentration range given above as preferred. This enables a regular pickling rate of 3 to 7 g aluminum per m 2 and minute at a bath temperature of 50 to 75 ° C. The quality of the treated pieces is consistently good.
Das während des Beizens gebildete Aluminiumhydroxid reichert sich im Beizbad an, ohne das Beizen zu stören. Es ist aber wünschenswert, den Feststoffgehalt des Bades zwischen 10 und 30 g/I zu halten, indem der Feststoff z.B. durch Dekantieren und/oder Filtrieren abgetrennt wird. Die Feststoffabtrennung kann chargenweise oder kontinuierlich durchgeführt werden, und wird zweckmäßigerweise jeweils in einem Teil des Beizbades durchgeführt. Die nach dem erfindungsgemäßen Verfahren erhaltene Filtrierform (Filtrationsrückstand) ist gut; der Filtrationskuchen ist leicht zu waschen und enthält mehr als 50% Feststoff, was die Auswertung des Aluminiumhydroxids erleichtert.The aluminum hydroxide formed during pickling accumulates in the pickling bath without disturbing the pickling. However, it is desirable to keep the solids content of the bath between 10 and 30 g / l by e.g. is separated by decanting and / or filtering. The solids separation can be carried out batchwise or continuously, and is expediently carried out in part of the pickling bath. The filtration form (filtration residue) obtained by the process according to the invention is good; The filtration cake is easy to wash and contains more than 50% solids, which makes it easier to evaluate the aluminum hydroxide.
Die Ausfällung von Aluminiumhydroxid kann durch Zugabe von Alkalisalzen, z.B. von Natriumcarbonat, vorzugsweise in einer Menge von 5 bis 100 g/I, insbesondere 20 bis 60 g/I, begünstigt werden. Der Aggregatzustand und damit die Filtrierbarkeit des gefällten Aluminiumhydroxids wird durch die Anwesenheit von Natriumgluconat beeinflußt. Zweckmäßig wird das Natriumgluconat in einer Menge Zugegeben, daß seine Konzentration im Bad zwischen 0,01 bis 1,0 g/I, insbesondere 0,1 bis 0,5 g/I beträgt.The precipitation of aluminum hydroxide can be carried out by adding alkali salts, e.g. of sodium carbonate, preferably in an amount of 5 to 100 g / l, in particular 20 to 60 g / l, favored. The physical state and thus the filterability of the precipitated aluminum hydroxide is influenced by the presence of sodium gluconate. The sodium gluconate is expediently added in an amount such that its concentration in the bath is between 0.01 to 1.0 g / l, in particular 0.1 to 0.5 g / l.
Die Lebensdauer des erfindungsgemäßen Beizbades ist praktisch unbegrenzt, wenn die durch Mitschleppen verursachten Verluste durch Zugabe der entsprechenden Mengen an frischen Chemikalien ergänzt werden. Diese Verluste und die entsprechenden Chemikalienkosten lassen sich auf einem Minimum halten, wenn man Filtrat und Waschwasser der Aluminiumhydroxid-Filtration sowie das Spülwasser der gebeizten Stücke in das Beizbad ganz oder teilweise zurückführt. Dieses Rückführen des Wasch- und Spülwassers dient ebenfalls zur Ergänzung des durch die Bildung des Aluminiumhydroxids und des durch Verdampfung entstandenen Wasserverlusts.The service life of the pickling bath according to the invention is practically unlimited if the losses caused by entrainment are supplemented by adding the appropriate amounts of fresh chemicals. These losses and the corresponding chemical costs can be kept to a minimum if the filtrate and washing water from the aluminum hydroxide filtration and the rinsing water of the pickled pieces are returned in whole or in part to the pickling bath. This return of the washing and rinsing water also serves to supplement the water loss caused by the formation of the aluminum hydroxide and the evaporation.
Der Ersatz und die Beseitigung der abgenützten Beizbäder ist nicht mehr erforderlich, wodurch eine beträchtliche Einsparung der Beizkosten erreicht werden kann. Die zur Durchführung des erfindungsgemäßen Beizverfahrens nötigen Zusatzinvestitionen sind gering und bestehen im wesentlichen aus den Kosten für eine Filtrationsanlage.The replacement and removal of the worn pickling baths is no longer necessary, which means that a considerable saving in pickling costs can be achieved. The additional investments required to carry out the pickling process according to the invention are low and essentially consist of the costs for a filtration system.
Claims (13)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT85102400T ATE54679T1 (en) | 1984-03-16 | 1985-03-04 | PICKLING PROCESS FOR ALUMINUM. |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1325/84 | 1984-03-16 | ||
| CH1325/84A CH660201A5 (en) | 1984-03-16 | 1984-03-16 | PROCESS FOR STRIPPING ALUMINUM IN AN ALKALINE LAUNDRY BATH. |
| DE19843426114 DE3426114A1 (en) | 1984-03-16 | 1984-07-16 | Pickling process for aluminium |
| DE3426114 | 1984-07-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0157190A1 EP0157190A1 (en) | 1985-10-09 |
| EP0157190B1 true EP0157190B1 (en) | 1990-07-18 |
Family
ID=25687339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19850102400 Expired - Lifetime EP0157190B1 (en) | 1984-03-16 | 1985-03-04 | Etching process for aluminium |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0157190B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1932948A1 (en) * | 2006-12-07 | 2008-06-18 | Italtecno S.R.L. | Apparatus and method for recovering caustic soda from caustic solutions |
| DE102008063729A1 (en) * | 2008-11-03 | 2010-05-06 | König, Thomas | Process for pickling workpiece made of aluminum or aluminum alloy that is subjected to a sting bath with an alkaline pickling solution, comprises continuous or sectional drawing-off a partial quantity of the pickling solution from the bath |
| WO2010060408A2 (en) | 2008-11-03 | 2010-06-03 | Koenig Thomas | Pickling method and pickling plant |
| DE102013108375A1 (en) * | 2013-01-31 | 2014-07-31 | Thomas König | Process for the preparation of a pickling and / or anodizing bath and anodizing arrangement |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4008379A1 (en) * | 1990-03-15 | 1991-09-19 | Gartner & Co J | METHOD AND SYSTEM FOR REGENERATING ALUMINUM ALUMINUM SOLUTIONS WITH ALKALINE |
| US5512129A (en) * | 1990-03-15 | 1996-04-30 | Josef Gartner & Co. | Method for regenerating alkaline solutions for pickling aluminum |
| CN112921316A (en) * | 2021-01-20 | 2021-06-08 | 福建省闽发铝业股份有限公司 | Green environment-friendly aluminum profile spraying pretreatment process |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1073272B (en) * | 1960-01-14 | Amchem Products Ine Ambler Pa (V St A) | andsdale Mounted Route Pa (V St A) I solution and means for etching aluminum | |
| US2653861A (en) * | 1953-03-09 | 1953-09-29 | Enthone | Etching aluminum using hexahydroxyheptanoic acid as a modifier |
| US2884728A (en) * | 1954-08-16 | 1959-05-05 | Turco Products Inc | Apparatus and method for removing metal from the surface of a metal object |
| FR1582144A (en) * | 1968-06-24 | 1969-09-26 | ||
| GB1420920A (en) * | 1971-12-30 | 1976-01-14 | Diversey Ltd | Etching compositions |
| DE2439202C3 (en) * | 1974-08-16 | 1979-09-27 | Friedr. Blasberg Gmbh & Co Kg, 5650 Solingen | Alkaline aqueous bath for etching aluminum and aluminum alloys |
| FR2555615B1 (en) * | 1983-11-24 | 1990-05-11 | Diversey France | ALUMINUM PROCESSING BATH AND METHOD OF IMPLEMENTING SAID BATH AND CHEMICAL MACHINING |
-
1985
- 1985-03-04 EP EP19850102400 patent/EP0157190B1/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1932948A1 (en) * | 2006-12-07 | 2008-06-18 | Italtecno S.R.L. | Apparatus and method for recovering caustic soda from caustic solutions |
| DE102008063729A1 (en) * | 2008-11-03 | 2010-05-06 | König, Thomas | Process for pickling workpiece made of aluminum or aluminum alloy that is subjected to a sting bath with an alkaline pickling solution, comprises continuous or sectional drawing-off a partial quantity of the pickling solution from the bath |
| WO2010060408A2 (en) | 2008-11-03 | 2010-06-03 | Koenig Thomas | Pickling method and pickling plant |
| DE102013108375A1 (en) * | 2013-01-31 | 2014-07-31 | Thomas König | Process for the preparation of a pickling and / or anodizing bath and anodizing arrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0157190A1 (en) | 1985-10-09 |
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