WO1997043462A1 - 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
- WO1997043462A1 WO1997043462A1 PCT/EP1997/001966 EP9701966W WO9743462A1 WO 1997043462 A1 WO1997043462 A1 WO 1997043462A1 EP 9701966 W EP9701966 W EP 9701966W WO 9743462 A1 WO9743462 A1 WO 9743462A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cleaning
- cleaner
- workpieces
- acid
- aqueous phase
- Prior art date
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 process for the removal of conversion layers remaining after the cold forming on metallic workpieces, which are contaminated with soaps, with aqueous, acidic cleaners, and its application to the cleaning of soaped on the workpieces made of aluminum or aluminum alloys after the cold forming
- the task is, among other things, to remove remaining phosphate, oxalate or aluminate layers, which are contaminated with lubricant, so-called drawn-in phosphate, oxalate and aluminate layers.
- oils and soaps used with the previously used as lubricants React chemically applied phosphate, oxalate or aluminate layer 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 common in the field of tube drawing, wire drawing, cold extrusion or ironing.
- the indented layers mentioned at the beginning must be removed especially if e.g. the intention is to anneal the workpiece softly, to carry out another chemical surface treatment or to paint it.
- Acid cleaning of aluminum, in particular cold-formed aluminum is known and i.a. in US-A-3 969 135 using the example of the cleaning of lubricated aluminum cans which were produced by deep drawing and ironing from thin sheet blanks.
- the basis of the acidic cleaner is sulfuric acid with a small amount of hydrofluoric acid.
- EP-A 275 043 describes a further acidic cleaning for aluminum or aluminum alloys. A mineral acid from the group consisting of sulfuric acid, phosphoric acid and nitric acid is used as the basis. Both of the above-mentioned processes have in common that the aluminum or aluminum alloy surface to be cleaned has been reshaped without prior conversion treatment using only lubricant.
- DE-A-3 843 148 describes a process for removing drawn-in conversion and soap layers with alkaline ones Cleaners and under the influence of ultrasound. After a correspondingly high load, the constituents of the detached conversion layers accumulate in the detergent bath and the bath must be disposed of, which is usually done by cleaving with acid.
- a disadvantage of this process is that larger amounts of strongly alkaline solution not only have to be neutralized, but also have to be strongly acidified.
- a further disadvantage of alkaline cleaning, especially of aluminum or aluminum alloys is that the material is dissolved when using strongly alkaline cleaners, or that the conversion layer containing lubricant is detached only very slowly and incompletely when using mild alkaline cleaners, even under the influence of ultrasound.
- the object of the invention is to provide a method for removing conversion layers which have remained after the cold forming on metallic workpieces and which are contaminated with soaps, with aqueous cleaners, which avoids the known disadvantages, in particular those mentioned above, and enables the cleaner to have a long service life.
- the object is achieved by designing the method of the type mentioned at the outset in such a way that cleaning is carried out with a cleaner containing nitric acid, phosphoric acid and / or amidosulfonic acid at a temperature above 60 ° C. and the cleaner is removed in the absence after a sufficiently high load cools the cleaned workpieces to a temperature below 55 ° C, separates the floating fatty acid layer and at least the predominant one Part of the aqueous phase is used to clean workpieces again.
- the converted conversion layers which are contaminated with soap, are detached quickly and completely from the workpiece.
- the fatty acid formed from the soap remains well dispersed in the cleaner at the cleaning temperatures of above 60 ° C, so that there is no further deposition of fatty acid on the workpieces.
- the cleaner After the cleaner has been sufficiently loaded, it is cooled to a temperature below 55 ° C.
- the fatty acid floats and can be removed in the simplest way. Cooling and removal of the fatty acid can be done in the cleaning bath itself, e.g. by stripping. The consequence of this measure is that the cleaning treatment must be temporarily interrupted. If this is not desired, part of the contaminated cleaner can be removed from the detergent bath, cooled in a separate device and freed from floating fatty acid Filtration or centrifugation is preferred.
- An advantageous embodiment of the invention therefore provides for the aqueous phase to be used again for cleaning by adding to the target concentration of the cleaning effective components, especially the acid.
- the amount of acid added can easily be determined 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 method according to the invention offers the advantage that workpieces made of aluminum or aluminum alloys can be cleaned properly.
- the advantages of the method according to the invention are particularly pronounced if, according to a further embodiment of the invention, the method is used to clean soaped calcium aluminate layers remaining on workpieces made of aluminum or aluminum alloys after cold forming.
- Aluminate layers are preferably used as conversion layers in connection with soap on thick-walled aluminum workpieces, compare see G. Siemund "Combining lubrication and phosphating in cold forming", Drahtwelt, Issue 11, 1963.
- 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:
- Comparative cleaner 1 80 g / 1 sodium hydroxide 20 g / 1 sodium gluconate
- Comparative cleaner 2 20 g / 1 H, S0 4
- Comparative cleaner 3 20 g / 1 HC1
- Comparative cleaner 1 proved to be completely unusable.
- the surfaces of the workpieces were rough, stained and matt after rinsing.
- Comparative cleaner 2 initially led to clean, shiny surfaces. After the throughput of a few workpieces, a crystalline coating remained on the surface of the shock absorber tubes after cleaning, which was retained even after the cleaning-effective components had been supplemented and the acid concentration had increased. In addition, a greasy film formed on the surface of the cleaning bath, which consisted essentially of fatty acid and stubbornly stuck to the treated parts. Cleaning with comparative cleaner 3 also initially led to clean surfaces. However, pitting easily seen with the naked eye was observed. In contrast, the results achieved with cleaners A and B were satisfactory in every respect. Not only were clean, shiny surfaces achieved, the cleaning effect also remained flawless after prolonged throughput of the workpieces. Although the cleaners became milky during their use, the workpieces were still completely wettable with water after rinsing.
- cleaners A and B In order to maintain the cleaning effect of the cleaners A and B, 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 / 1 free amidosulfonic acid or 1.3 g / 1 nitric acid. Depending on the titration result, 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 the cleaner was prepared.
- the cleaner bath was lowered to a temperature of 45 ° C.
- the phosphate and soap layers were completely removed by the above treatment.
- the concentration of the detergent on cleaning-effective components was monitored by titration, used acid and other detergent components were supplemented in the manner mentioned above.
- the contaminated cleaner was regenerated by cooling to 40 ° C, removing the floating, granular fatty acid and re-adjusting the cleaning 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)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU26998/97A AU2699897A (en) | 1996-05-10 | 1997-04-18 | Process for removing soap-contaminated conversion layers on metal workpieces |
EP97920718A EP0898621B1 (de) | 1996-05-10 | 1997-04-18 | Verfahren zum entfernen von mit seifen behafteten konversionsschichten von metallischen werkstücken |
US09/202,016 US6153015A (en) | 1996-05-10 | 1997-04-18 | Process for removing soap-contaminated conversion layers on metal workpieces |
DE59700669T DE59700669D1 (de) | 1996-05-10 | 1997-04-18 | Verfahren zum entfernen von mit seifen behafteten konversionsschichten von metallischen werkstücken |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19618899A DE19618899A1 (de) | 1996-05-10 | 1996-05-10 | Verfahren zum Entfernen von mit Seifen behafteten Konversionsschichten von metallischen Werkstücken |
DE19618899.7 | 1996-05-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997043462A1 true WO1997043462A1 (de) | 1997-11-20 |
Family
ID=7793973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/001966 WO1997043462A1 (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) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19618899A1 (de) | 1996-05-10 | 1997-11-13 | Metallgesellschaft Ag | Verfahren zum Entfernen von mit Seifen behafteten Konversionsschichten von metallischen Werkstücken |
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 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2159488A1 (de) * | 1971-11-11 | 1973-06-22 | Basf Wyandotte Corp | |
JPS52104556A (en) * | 1976-02-28 | 1977-09-02 | Matsushita Electric Works Ltd | Process for stripping inorganic coats |
EP0275043A1 (de) * | 1987-01-12 | 1988-07-20 | Nihon Parkerizing Co., Ltd. | Saurer Reiniger für Aluminium |
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 |
EP0603763A1 (de) * | 1992-12-24 | 1994-06-29 | NORSK HYDRO CHEMTECH GmbH | Verwendung von leicht entfernbaren Inhibitoren in Beizsäuren |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT293139B (de) * | 1967-02-16 | 1971-09-27 | Degussa | Verfahren zum Entzundern von Metallen |
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 |
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 |
DE3843148A1 (de) * | 1988-12-22 | 1990-06-28 | Metallgesellschaft Ag | Verfahren zum reinigen von werkstuecken |
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 CA CA002254846A patent/CA2254846A1/en not_active Abandoned
- 1997-04-18 US US09/202,016 patent/US6153015A/en not_active Expired - Fee Related
- 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 WO PCT/EP1997/001966 patent/WO1997043462A1/de active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2159488A1 (de) * | 1971-11-11 | 1973-06-22 | Basf Wyandotte Corp | |
JPS52104556A (en) * | 1976-02-28 | 1977-09-02 | Matsushita Electric Works Ltd | Process for stripping inorganic coats |
EP0275043A1 (de) * | 1987-01-12 | 1988-07-20 | Nihon Parkerizing Co., Ltd. | Saurer Reiniger für Aluminium |
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 |
EP0603763A1 (de) * | 1992-12-24 | 1994-06-29 | NORSK HYDRO CHEMTECH GmbH | Verwendung von leicht entfernbaren Inhibitoren in Beizsäuren |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Section Ch Week 7741, Derwent World Patents Index; Class G04, AN 77-73486Y, XP002020223 * |
PATENT ABSTRACTS OF JAPAN vol. 015, no. 076 (C - 0809) 21 February 1991 (1991-02-21) * |
Also Published As
Publication number | Publication date |
---|---|
CA2254846A1 (en) | 1997-11-20 |
DE19618899A1 (de) | 1997-11-13 |
DE59700669D1 (de) | 1999-12-09 |
EP0898621A1 (de) | 1999-03-03 |
EP0898621B1 (de) | 1999-11-03 |
AU2699897A (en) | 1997-12-05 |
US6153015A (en) | 2000-11-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2528602C3 (de) | Verfahren zur Entfernung einer Öl-in-Wasser-Emulsion von der Oberfläche eines hiermit beschichteten Gegenstandes | |
DE2736874C2 (de) | Verfahren zur Erleichterung der Kaltumformung von Metallen | |
EP0275043A1 (de) | Saurer Reiniger für Aluminium | |
DE3928323A1 (de) | Reiniger fuer aluminium | |
EP0271791A2 (de) | Verwendung kurzkettiger Alkansulfonsäuren in Reinigungs- und Desinfektionsmitteln | |
DE69203430T2 (de) | Entfettungslösung und deren Verfahren. | |
WO2007056992A1 (de) | Verfahren und mittel zur elektrolytischen reinigung und entzunderung eines metallischen werkstücks | |
WO2004050808A2 (de) | Schmierstoffbeschichtetes metallblech mit verbesserten umformeigenschaften | |
DE2711429A1 (de) | Verfahren zur reinigung von zinn- oberflaechen | |
DE69534340T2 (de) | Säurebehandlung von rostfreiem stahl | |
DE2758629C3 (de) | Verfahren zum Reinigen der verzinnten Oberfläche eines eisenhaltigen Metalls | |
DE3844183A1 (de) | Waessriger reiniger fuer metalloberflaechen | |
EP0898621B1 (de) | Verfahren zum entfernen von mit seifen behafteten konversionsschichten von metallischen werkstücken | |
EP0031103B1 (de) | Verfahren zur Vorbehandlung von Metalloberflächen vor dem Phosphatieren | |
CH620248A5 (en) | Method for the more economical use of water in phosphating metals | |
DE3213649A1 (de) | Verfahren zum reinigen und entfetten sowie aktivieren von metalloberflaechen | |
DE3600415C2 (de) | ||
EP0224190B1 (de) | Verfahren zur Aktivierung von Metalloberflächen vor einer Zinkphosphatierung | |
EP0230903B1 (de) | Verfahren zur Reinigung von Aluminiumbehältern | |
DE3222532C2 (de) | ||
DE2540685C2 (de) | Verfahren zur Herstellung von Phosphatüberzügen | |
EP0101126B1 (de) | Verfahren zur Behandlung abgearbeiteter Beizpasten | |
DE3217145A1 (de) | Verfahren zum reinigen, entfetten sowie aktivieren von metalloberflaechen | |
DE19844391C2 (de) | Verfahren zur Vorbereitung von Werkstücken für die Kaltumformung | |
DE2507059A1 (de) | Verfahren zur reinigung von eisen enthaltenden metallgegenstaenden |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AU CA US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1997920718 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2254846 Country of ref document: CA Ref country code: CA Ref document number: 2254846 Kind code of ref document: A Format of ref document f/p: F |
|
WWE | Wipo information: entry into national phase |
Ref document number: 09202016 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 1997920718 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1997920718 Country of ref document: EP |