EP0898621B1 - Verfahren zum entfernen von mit seifen behafteten konversionsschichten von metallischen werkstücken - Google Patents
Verfahren zum entfernen von mit seifen behafteten konversionsschichten von metallischen werkstücken Download PDFInfo
- Publication number
- EP0898621B1 EP0898621B1 EP97920718A EP97920718A EP0898621B1 EP 0898621 B1 EP0898621 B1 EP 0898621B1 EP 97920718 A EP97920718 A EP 97920718A EP 97920718 A EP97920718 A EP 97920718A EP 0898621 B1 EP0898621 B1 EP 0898621B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cleaning
- acid
- workpieces
- cleaner
- soap
- 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
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
- C23G1/36—Regeneration of waste pickling liquors
-
- 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 a method for removing after cold forming remaining on metallic workpieces, conversion layers with soaps and aqueous, acidic cleaners and their application to the cleaning of on workpieces made of aluminum or aluminum alloys of the remaining cold soaps Calcium aluminate layers.
- Chipless cold forming is one of the the task, remaining phosphate, oxalate or aluminate layers, so-called drawn-in phosphate, Oxalate and aluminate layers to remove.
- a lubricant In particular, oils and soaps are used that are compatible with the applied phosphate, oxalate or aluminate layer chemically react and thereby form an intimate connection.
- the Preparation of cold forming by applying phosphate, Oxalate and aluminate layers and the subsequent treatment with lubricants is particularly in the area of Tube drawing, wire drawing, cold extrusion or Ironing is common.
- indented layers mentioned at the beginning must precede be removed if e.g. is intended to Work piece softly glow, another chemical Surface treatment or painting.
- Acid cleaning of aluminum, especially cold Formed aluminum is known and among other things.
- the acidic cleaner is based on sulfuric acid with a called small addition of hydrofluoric acid.
- Another acidic one Cleaning for aluminum or aluminum alloys describes EP-A 275 043.
- a mineral acid from the group is used as the basis Sulfuric acid, phosphonic acid and nitric acid are used. Both of the above-mentioned methods have in common that the to cleaning aluminum or aluminum alloy surface without previous conversion treatment under sole Formed using lubricant.
- DE-A-3 843 148 describes a method for removal indented conversion and soap layers with alkaline Cleaners and under the influence of ultrasound. After correspondingly high loading, the components of the detached conversion layers in the detergent bath and the bath must be disposed of, which is usually caused by cleavage Acid happens.
- a disadvantage of this method is that not only larger amounts of strongly alkaline solution neutralized, but also strongly acidified have to.
- a disadvantage of alkaline cleaning especially from Aluminum or aluminum alloys is also that at Use of strongly alkaline detergents which dissolve the material or one only when using mild alkaline cleaners very slow and incomplete replacement of the lubricant affected conversion layer even under the influence of Ultrasound is done.
- the workpieces are also known initially to remove sodium stearate in a immerse alkaline degreasing solution, then with hot water to wash and remove zinc stearate and Phosphate layer with a pickling solution based on phosphoric acid to treat. Finally, the work pieces with water washed and dipped in a neutralizing solution.
- the object of the invention is a method for removing after cold forming on metallic workpieces remaining conversion layers with soaps to provide aqueous cleaners that the known, avoids in particular the aforementioned disadvantages and a high Service life of the cleaner enables.
- the task is solved by the procedure of the beginning mentioned type is trained in such a way that the Cleaning with a nitric acid, phosphoric acid and / or Amidosulfonic acid containing cleaner at one temperature above 60 ° C and the cleaner after sufficiently high load in the absence of the cleaned workpieces on a temperature below 55 ° C cools, the floating Separates fatty acid layer and at least the predominant Part of the aqueous phase for re-cleaning workpieces starts.
- the drawn-in, conversion layers coated with soap quickly and completely detached from the workpiece.
- the soap formed fatty acid remains with the used Cleaning temperatures above 60 ° C well in the cleaner dispersed so that redeposition of fatty acid on the workpieces with certainty.
- fatty acid floats and can be done in the simplest way be separated. Cooling and removal of the fatty acid can in the cleaning bath itself, e.g. by stripping. This Measure has the consequence that the cleaning treatment must be temporarily interrupted. In the event that this part of the contaminated cleaner may not be desired removed from the detergent bath, in a separate device cooled and freed from floating fatty acids. The Separation can also be done by stripping, however is in this way of separating the fatty acid Filtration or centrifugation is preferred.
- An advantageous embodiment of the invention therefore provides for the one to be used again for cleaning aqueous phase by adding to the target concentration of cleaning components, especially the acid, adjust.
- the amount of acid added can be easily by an acid-base titration.
- Another preferred embodiment of the invention provides for cleaning to be carried out with a cleaner which contains a surfactant.
- Surfactants based on alkylamine ethoxylates are particularly advantageous. Alkylamine ethoxylates react cationically in an acidic environment and non-ionically in a neutral environment. Examples of such surfactants are Genamin R C100 from Hoechst AG, described as ethoxylated coconut fatty amine with 10 moles of ethylene oxide per molecule, or Marlazin R L10 from Chemische Werke Hüls AG, described as fatty amine ethoxylate.
- the process according to the invention offers fatty acid in particular also the advantage that workpieces made of aluminum or Aluminum alloys can be cleaned properly.
- Shock absorber tubes were made by cold extrusion from aluminum blanks, which had been provided with a conversion layer made of calcium aluminate before being formed and then treated with a reactive soap. The amount of calcium aluminate and soap applied after the forming was about 10 g / m 2 .
- the shock absorber tubes were cleaned in accordance with the invention at 70 ° C. for 10 minutes in immersion, then rinsed with water and dried. The following cleaners were used in the process according to the invention: Cleaner A 5% HNO3 (100%) 0.2% Genamin C100 (Hoechst AG) Rest of water Cleaner B 2% amidosulfonic acid (100%) 0.3% Genamin C100 (Hoechst AG) Rest of water
- Comparative cleaner 1 80 g / l sodium hydroxide 20 g / l sodium gluconate 5 g / l sodium dodecylbenzenesulfonate Rest of water Comparative cleaner 2 20 g / l H 2 SO 4 Rest of water Comparative cleaner 3 20 g / l HCl 3 g / l Genamin C100 (Hoechst AG) Rest of water
- Comparative cleaner 2 initially led to clean shiny surfaces. After the throughput of a few Workpieces remained on the surface of the after cleaning Shock absorber pipes a crystalline coating that also after Supplement to the cleaning-effective components and one Increase in acid concentration was maintained. In addition changed on the surface of the cleaning bath greasy film consisting essentially of fatty acid and stubbornly stuck to the treated parts. Also cleaning with comparative cleaner 3 initially led to clean surfaces. However, one became easy with the naked eye recognizable pitting observed.
- a bath sample of 5 ml was taken at certain intervals and titrated with bromocresol green as an indicator with 0.1N sodium hydroxide solution.
- the consumption of 1 ml 0.1 n sodium hydroxide solution corresponds to about 2 g / l free amidosulfonic acid or 1.3 g / l nitric acid.
- the cleaners A and B were supplemented with amidosulfonic acid or nitric acid and with the surfactant Genamin R C100 in the same ratio as when using a cleaner.
- the cleaner bath was lowered to a temperature of 45 ° C.
- the cleaner contained 150 g / l phosphoric acid 1 g / l Ferhibit R S, a pickling inhibitor from CHEMETALL GmbH 2 g / l Marlazin R L10 rest water
- the concentration of the Cleaner on components effective for cleaning was by Titration monitors, acid used as well as others Detergent components added in the manner mentioned above.
- the contaminated cleaner was regenerated by Cooling to 40 ° C, removal of the floating, granular Fatty acid and readjustment of the cleaning effective Components to the original concentration. The cleaner could be kept effective for several weeks.
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)
Description
Reiniger A | 5 % HNO3 (100 %) |
0,2 % Genamin C100 (Hoechst AG) | |
Rest Wasser | |
Reiniger B | 2 % Amidosulfonsäure (100 %) |
0,3 % Genamin C100 (Hoechst AG) | |
Rest Wasser |
Vergleichsreiniger 1 | 80 g/l Natriumhydroxid |
20 g/l Natriumglukonat | |
5 g/l Natriumdodecylbenzolsulfonat | |
Rest Wasser | |
Vergleichsreiniger 2 | 20 g/l H2SO4 |
Rest Wasser | |
Vergleichsreiniger 3 | 20 g/l HCl |
3 g/l Genamin C100 (Hoechst AG) | |
Rest Wasser |
150 g/l | Phosphorsäure |
1 g/l | FerhibitR S, ein Beizinhibitor der CHEMETALL GmbH |
2 g/l | MarlazinR L10 |
Rest | Wasser |
Claims (5)
- Verfahren zum Entfernen von nach der Kaltumformung auf metallischen Werkstücken verbliebenen, mit Seifen behafteten Konversionsschichten mit wäßrigen, sauren Reinigern, dadurch gekennzeichnet, daß man die Reinigung mit einem Salpetersäure, Phosphorsäure und/oder Amidosulfonsäure enthaltendem Reiniger bei einer Temperatur oberhalb 60°C vornimmt und den Reiniger nach hinreichend hoher Belastung in Abwesenheit der gereinigten Werkstücke auf eine Temperatur unterhalb 55°C abkühlt, die dabei aufschwimmende Fettsäureschicht abtrennt und mindestens den überwiegenden Teil der wäßrigen Phase erneut zur Reinigung einsetzt.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die erneut zur Reinigung einzusetzende wäßrige Phase durch Ergänzung auf die Sollkonzentration der reinigungswirksamen Komponenten einstellt.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man die Reinigung mit einem Reiniger vornimmt, der ein Tensid enthält.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß man die Reinigung mit einem Reiniger vornimmt, der Alkylaminethoxylat als Tensid enthält.
- Anwendung des Verfahrens nach einem oder mehreren der Ansprüche 1 bis 4 auf die Reinigung von auf Werkstücken aus Aluminium oder Aluminiumlegierungen nach der Kaltumformung verbliebene beseifte Kalziumaluminatschichten.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19618899 | 1996-05-10 | ||
DE19618899A DE19618899A1 (de) | 1996-05-10 | 1996-05-10 | Verfahren zum Entfernen von mit Seifen behafteten Konversionsschichten von metallischen Werkstücken |
PCT/EP1997/001966 WO1997043462A1 (de) | 1996-05-10 | 1997-04-18 | Verfahren zum entfernen von mit seifen behafteten konversionsschichten von metallischen werkstücken |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0898621A1 EP0898621A1 (de) | 1999-03-03 |
EP0898621B1 true EP0898621B1 (de) | 1999-11-03 |
Family
ID=7793973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97920718A Expired - Lifetime EP0898621B1 (de) | 1996-05-10 | 1997-04-18 | Verfahren zum entfernen von mit seifen behafteten konversionsschichten von metallischen werkstücken |
Country Status (6)
Country | Link |
---|---|
US (1) | US6153015A (de) |
EP (1) | EP0898621B1 (de) |
AU (1) | AU2699897A (de) |
CA (1) | CA2254846A1 (de) |
DE (2) | DE19618899A1 (de) |
WO (1) | WO1997043462A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6153015A (en) * | 1996-05-10 | 2000-11-28 | Metallgesellschaft Ag | Process for removing soap-contaminated conversion layers on metal workpieces |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7737097B2 (en) | 2003-06-27 | 2010-06-15 | Lam Research Corporation | Method for removing contamination from a substrate and for making a cleaning solution |
DE102013226533A1 (de) | 2013-12-18 | 2015-06-18 | MAHLE Behr GmbH & Co. KG | Reiniger für ein Aluminiumbauteil und ein Verfahren zur Reinigung von Aluminiumbauteilen |
CN104313604A (zh) * | 2014-09-26 | 2015-01-28 | 无锡市天力五金弹簧厂 | 一种弹簧清洗工艺 |
CN113182258B (zh) * | 2021-04-29 | 2022-12-02 | 中国电子科技集团公司第九研究所 | 一种铁氧体球形谐振子清洗方法 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT293139B (de) * | 1967-02-16 | 1971-09-27 | Degussa | Verfahren zum Entzundern von Metallen |
GB1413649A (en) * | 1971-11-11 | 1975-11-12 | Basf Wyandotte Corp | Accelerating the cleaning of metal surfaces by means of acid cleaning baths |
BE788674A (fr) * | 1972-02-19 | 1973-01-02 | Parker Ste Continentale | Solution de nettoyage et degraissage de pieces de fer et d'acier |
US3969135A (en) * | 1975-02-13 | 1976-07-13 | Oxy Metal Industries Corporation | Low temperature aluminum cleaning composition and process |
JPS52104556A (en) * | 1976-02-28 | 1977-09-02 | Matsushita Electric Works Ltd | Process for stripping inorganic coats |
DE3105508A1 (de) * | 1981-02-14 | 1982-09-02 | Metallgesellschaft Ag, 6000 Frankfurt | Beiz- und entrostungspaste fuer metalle |
JPS6020463B2 (ja) * | 1982-06-04 | 1985-05-22 | 日本パ−カライジング株式会社 | 鉄鋼材の冷間加工潤滑処理方法 |
US4415415A (en) * | 1982-11-24 | 1983-11-15 | Allegheny Ludlum Steel Corporation | Method of controlling oxide scale formation and descaling thereof from metal articles |
DE3247431A1 (de) * | 1982-12-22 | 1984-06-28 | Henkel KGaA, 4000 Düsseldorf | Verfahren zur regenerierung bzw. zum recycling von waessrigen entfettungs- und reinigungsloesungen |
JPS63172799A (ja) * | 1987-01-12 | 1988-07-16 | 日本パ−カライジング株式会社 | アルミニウムの表面洗浄剤 |
DE3843148A1 (de) * | 1988-12-22 | 1990-06-28 | Metallgesellschaft Ag | Verfahren zum reinigen von werkstuecken |
JPH02301579A (ja) * | 1989-05-15 | 1990-12-13 | Mazda Motor Corp | 冷間プレス部品の表面処理方法 |
DE4244245A1 (de) * | 1992-12-24 | 1994-06-30 | Norsk Hydro Chemtech Gmbh | Verwendung von leicht entfernbaren Inhibitoren in Beizsäuren |
US5501741A (en) * | 1994-01-11 | 1996-03-26 | Uss-Posco | Process for purifying aqueous rinse solutions used in metal forming operations |
DE19618899A1 (de) * | 1996-05-10 | 1997-11-13 | Metallgesellschaft Ag | Verfahren zum Entfernen von mit Seifen behafteten Konversionsschichten von metallischen Werkstücken |
-
1996
- 1996-05-10 DE DE19618899A patent/DE19618899A1/de not_active Withdrawn
-
1997
- 1997-04-18 WO PCT/EP1997/001966 patent/WO1997043462A1/de active IP Right Grant
- 1997-04-18 AU AU26998/97A patent/AU2699897A/en not_active Abandoned
- 1997-04-18 EP EP97920718A patent/EP0898621B1/de not_active Expired - Lifetime
- 1997-04-18 DE DE59700669T patent/DE59700669D1/de not_active Expired - Fee Related
- 1997-04-18 US US09/202,016 patent/US6153015A/en not_active Expired - Fee Related
- 1997-04-18 CA CA002254846A patent/CA2254846A1/en not_active Abandoned
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6153015A (en) * | 1996-05-10 | 2000-11-28 | Metallgesellschaft Ag | Process for removing soap-contaminated conversion layers on metal workpieces |
Also Published As
Publication number | Publication date |
---|---|
US6153015A (en) | 2000-11-28 |
CA2254846A1 (en) | 1997-11-20 |
DE19618899A1 (de) | 1997-11-13 |
DE59700669D1 (de) | 1999-12-09 |
WO1997043462A1 (de) | 1997-11-20 |
EP0898621A1 (de) | 1999-03-03 |
AU2699897A (en) | 1997-12-05 |
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