EP0019752B1 - Process for pickling metals - Google Patents
Process for pickling metals Download PDFInfo
- Publication number
- EP0019752B1 EP0019752B1 EP80102456A EP80102456A EP0019752B1 EP 0019752 B1 EP0019752 B1 EP 0019752B1 EP 80102456 A EP80102456 A EP 80102456A EP 80102456 A EP80102456 A EP 80102456A EP 0019752 B1 EP0019752 B1 EP 0019752B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pickling
- paste
- sprayed
- surfactant
- pickling paste
- 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
Links
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
- 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
- C23G1/025—Cleaning or pickling metallic material with solutions or molten salts with acid solutions acidic pickling pastes
Definitions
- the invention relates to a method for pickling metals, in particular stainless steel, by spraying a pickling paste onto the surface to be pickled.
- the invention is therefore based on the object of proposing a method for pickling metals which is distinguished by a higher working speed, lower material consumption, better quality of the pickling process and increased user friendliness.
- the invention is characterized in that a surfactant solution is sprayed onto the surface before the spraying of the pickling paste, so that when the spraying pickling paste is sprayed on, a film of the surfactant solution is already on the surface.
- the viscosity of the surfactant solution is adjusted so that on the one hand it is still sprayable, but on the other hand it does not run off completely on vertical surfaces. This creates an approximately 0.1 mm thick liquid film with surface-active substances on the entire surface to be treated.
- the pickling paste is then sprayed on in a second step. Spraying ensures that the entire area is applied evenly. However, the pickling paste is set so low viscous that it can be sprayed through a single-component nozzle (e.g. a lime nozzle) at about 3 to 5 bar.
- a single-component nozzle e.g. a lime nozzle
- the active acids now diffuse into the liquid film, so that a state is reached which corresponds to that of immersing the workpiece in a pickling bath.
- a spray lance with a suitable nozzle is preferably used.
- the process requires less material, so that there is a material saving despite the additional use of the surfactant.
- the working speed is also noticeably increased, so that despite the necessary two-coat application (surfactant solution and pickling paste), an area can be stained in about half the time than was the case in the prior art.
- the surface quality in the process according to the invention corresponds to that after the immersion process.
- the viscosity of the pickling paste is about half as large as the viscosity of a pickling paste to be applied with a brush, as was previously used by the applicant. Depending on the shear rate of the pickling paste measured in sec-1, this factor is 0.41 at a shear rate of 106 and increases from 1 198 to 0.68 at a shear rate.
- the viscosity of the new pickling paste also measured in mPa.s, is e.g. at shear rate 106 at 126 and at shear rate 1 198 at 29.7 (all data in mPa.s).
Landscapes
- 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)
- Detergent Compositions (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Beizen von Metallen, insbesonders Edelstahl, unter Aufsprühen einer Beizpaste auf die zu beizende Fläche.The invention relates to a method for pickling metals, in particular stainless steel, by spraying a pickling paste onto the surface to be pickled.
Üblicherweise werden Beizpasten auf metallische Flächen mit Hilfe einer Bürste, eines Besens, eines Pinsels oder dergleichen aufgetragen. Dieses Arbeitsverfahren ist aber sehr arbeitsintensiv und hat verschiedene Nachteile :
- 1. Durch die Hilfsmittel wird die Beizpaste ungleichmäßig aufgetragen und damit wird eine unterschiedliche Beizung der Fläche erreicht, d.h., man sieht nach dem Beizen die einzelnen Pinselstriche auf der Oberfläche.
- 2. Die Pasten sind hochviskos, um nicht vom Arbeitsgerät abzutropfen. Dadurch ist der Verbrauch relativ hoch (ca. 0,5 kg/m2).
- 3. Das Aufbringen dauert ziemlich lange. An schwer zugänglichen Stellen kann nur schwierig oder in ungenügendem Maße Beizpaste aufgetragen werden.
- 4. Der Verarbeiter muß sehr nahe an die Fläche und damit an die relativ gefährliche Substanz heran, so daß das übliche Auftragsverfahren nicht verarbeitungsfreundlich ist.
- 1. The staining paste is applied unevenly with the aid and thus different staining of the surface is achieved, ie after the staining you can see the individual brushstrokes on the surface.
- 2. The pastes are highly viscous so that they do not drip off the implement. This means that the consumption is relatively high (approx. 0.5 kg / m 2 ).
- 3. It takes a long time to apply. Pickling paste is difficult or inadequate to apply in hard-to-reach places.
- 4. The processor must come very close to the surface and thus to the relatively dangerous substance, so that the usual application process is not easy to process.
Die US-PS 3,598,741 beschreibt das Aufsprühen einer hochviskosen Beizpaste auf Metall. Auch hierbei ergeben sich somit die vorstehend erwähnten Nachteile. Von diesem Verfahren geht die Erfindung aus.US Pat. No. 3,598,741 describes the spraying of a highly viscous pickling paste on metal. This also results in the disadvantages mentioned above. The invention is based on this method.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zum Beizen von Metallen vorzuschlagen, welches sich durch eine höhere Arbeitsgeschwindigkeit, geringeren Materialverbrauch, bessere Qualität des Beizvorganges und erhöhte Verbraucherfreundlichkeit auszeichnet. Zur Lösung dieser Aufgabe ist die Erfindung dadurch gekennzeichnet, daß vor dem Sprühauftrag der Beizpaste eine Tensidlösung auf die Fläche aufgesprüht wird, sodaß bei dem Aufsprühen det Beizpaste sich bereits ein Film der Tensidlösung auf der Fläche befindet.The invention is therefore based on the object of proposing a method for pickling metals which is distinguished by a higher working speed, lower material consumption, better quality of the pickling process and increased user friendliness. To achieve this object, the invention is characterized in that a surfactant solution is sprayed onto the surface before the spraying of the pickling paste, so that when the spraying pickling paste is sprayed on, a film of the surfactant solution is already on the surface.
Die Tensidlösung ist in der Viskosität so eingestellt, daß sie einerseits noch versprühbar ist, andererseits aber auch an senkrechten Flächen nicht vollständig abläuft. Dadurch wird auf der gesamten zu behandelnden Oberfläche ein etwa 0,1 mm starker Flüssigkeitsfilm mit oberflächenaktiven Substanzen erzeugt.The viscosity of the surfactant solution is adjusted so that on the one hand it is still sprayable, but on the other hand it does not run off completely on vertical surfaces. This creates an approximately 0.1 mm thick liquid film with surface-active substances on the entire surface to be treated.
In einem zweiten Arbeitsgang wird anschließend die Beizpaste aufgesprüht. Durch das Sprühen wir ein gleichmäßiger Auftrag auf die gesamte Fläche erreicht. Die Beizpaste wird jedoch so niedrig viskos eingestellt, daß sie sich durch eine Einstoffdüse (z.B. eine Kalkdüse) bei etwa 3 bis 5 bar versprühen läßt. Die beizwirksamen Säuren diffundieren nun in den Flüssigkeitsfilm, so daß ein Zustand erreicht wird, der dem des Tauchens des Werkstückes in ein Beizbad entspricht.The pickling paste is then sprayed on in a second step. Spraying ensures that the entire area is applied evenly. However, the pickling paste is set so low viscous that it can be sprayed through a single-component nozzle (e.g. a lime nozzle) at about 3 to 5 bar. The active acids now diffuse into the liquid film, so that a state is reached which corresponds to that of immersing the workpiece in a pickling bath.
Weil sowohl das Tensid wie auch die Beizpaste aufgesprüht werden, erscheinen auf der behandelnden Fläche keine Spuren eines Auftragewerkzeuges mehr. Außerdem sind auch sonst schwer zugängliche Ecken und dergleichen leicht zu besprühen. Hierzu wird vorzugsweise eine Sprühlanze mit einer geeigneten Düse (Kalkdüse) verwendet. Das Verfahren hat einen geringeren Materialbedarf, so daß trotz der zusätzlichen Verwendung des Tensides sich eine Materialersparnis ergibt. Üblicherweise benötigt man zum Beizen eines Quadratmeters mehr als 0,5 kg Beizpaste. Bei dem erfindungsmäßigen Verfahren benötigt man nur etwa 0,25 kg für einen Quadratmeter zuzüglich etwa 0,1 kg Tensidlösung.Because both the surfactant and the pickling paste are sprayed on, no traces of an application tool appear on the treated area. In addition, corners and the like that are otherwise difficult to access are easy to spray. For this purpose, a spray lance with a suitable nozzle (lime nozzle) is preferably used. The process requires less material, so that there is a material saving despite the additional use of the surfactant. Usually you need more than 0.5 kg of pickling paste to pickle a square meter. In the method according to the invention, only about 0.25 kg are required for one square meter plus about 0.1 kg of surfactant solution.
Auch die Arbeitsgeschwindigkeit wird fühlbar erhöht, so daß trotz des notwendigen zweifagen Auftrags (Tensidlösung und Beizpaste) eine Fläche in etwa der halben Zeit gebeizt werden kann als dies beim Stand der Technik der Fall war. Die Oberflächenqualität beim erfindungsmäßigen Verfahren entspricht derjenigen nach dem Tauchverfahren.The working speed is also noticeably increased, so that despite the necessary two-coat application (surfactant solution and pickling paste), an area can be stained in about half the time than was the case in the prior art. The surface quality in the process according to the invention corresponds to that after the immersion process.
Es lassen sich nach dem neuartigen Verfahren alle rost- und säurebeständigen Stähle, Nickel und Nickellegierungen sowie Kupfer-Nickel-Legierungen beizen.All rust and acid resistant steels, nickel and nickel alloys as well as copper-nickel alloys can be pickled using the new process.
Die Viskosität der Beizpaste ist etwa halb so groß wie die Viskosität einer mit dem Pinsel aufzutragenden Beizpaste, wie sie bei der Anmelderin bisher verwendet wurde. Abhängig von der in sec-1 gemessenen Schergeschwindigkeit der Beizpaste liegt dieser Faktor bei einer Schergeschwindigkeit von 106 bei 0,41 und steigt bei einer Schergeschwindigkeit von 1 198 auf 0,68 an. Die ebenfalls in mPa.s gemessene Viskosität der neuartigen Beizpaste liegt z.B. bei der Schergeschwindigkeit 106 bei 126 und bei der Schergeschwindigkeit 1 198 bei 29,7 (Alle Angaben in mPa.s).The viscosity of the pickling paste is about half as large as the viscosity of a pickling paste to be applied with a brush, as was previously used by the applicant. Depending on the shear rate of the pickling paste measured in sec-1, this factor is 0.41 at a shear rate of 106 and increases from 1 198 to 0.68 at a shear rate. The viscosity of the new pickling paste, also measured in mPa.s, is e.g. at shear rate 106 at 126 and at shear rate 1 198 at 29.7 (all data in mPa.s).
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT80102456T ATE386T1 (en) | 1979-05-25 | 1980-05-06 | PROCESS FOR PICKLING METALS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792921209 DE2921209A1 (en) | 1979-05-25 | 1979-05-25 | METHOD FOR METALING |
| DE2921209 | 1979-05-25 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0019752A1 EP0019752A1 (en) | 1980-12-10 |
| EP0019752B1 true EP0019752B1 (en) | 1981-11-11 |
| EP0019752B2 EP0019752B2 (en) | 1984-12-19 |
Family
ID=6071675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80102456A Expired EP0019752B2 (en) | 1979-05-25 | 1980-05-06 | Process for pickling metals |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0019752B2 (en) |
| AT (1) | ATE386T1 (en) |
| DE (2) | DE2921209A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991011543A1 (en) * | 1990-01-29 | 1991-08-08 | Preussag Aktiengesellschaft | Process for removing oil from finely divided solid material, especially metal-containing production waste and soiled floors |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2735818A (en) * | 1956-02-21 | Scale removal | ||
| FR1026317A (en) * | 1950-10-20 | 1953-04-27 | Colloides Ind Francais | New process for preparing surfaces, especially aluminum surfaces before painting |
| US3239467A (en) * | 1962-02-15 | 1966-03-08 | Lord Corp | Metal cleaning and treating compositions |
| GB1279834A (en) * | 1968-10-07 | 1972-06-28 | Chugai Kasei Co Ltd | Improvements in metal cleaning and etching compositions |
| US4032466A (en) * | 1976-04-16 | 1977-06-28 | Basf Wyandotte Corporation | Acid cleaner and process for disposal thereof |
-
1979
- 1979-05-25 DE DE19792921209 patent/DE2921209A1/en not_active Withdrawn
-
1980
- 1980-05-06 EP EP80102456A patent/EP0019752B2/en not_active Expired
- 1980-05-06 DE DE8080102456T patent/DE3060078D1/en not_active Expired
- 1980-05-06 AT AT80102456T patent/ATE386T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE3060078D1 (en) | 1982-01-14 |
| ATE386T1 (en) | 1981-11-15 |
| EP0019752B2 (en) | 1984-12-19 |
| EP0019752A1 (en) | 1980-12-10 |
| DE2921209A1 (en) | 1980-11-27 |
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