EP1135543B1 - Vorbereitung von werkstücken für die kaltumformung - Google Patents
Vorbereitung von werkstücken für die kaltumformung Download PDFInfo
- Publication number
- EP1135543B1 EP1135543B1 EP99969750A EP99969750A EP1135543B1 EP 1135543 B1 EP1135543 B1 EP 1135543B1 EP 99969750 A EP99969750 A EP 99969750A EP 99969750 A EP99969750 A EP 99969750A EP 1135543 B1 EP1135543 B1 EP 1135543B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- workpieces
- acid
- solution
- lactic acid
- rinsing
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
Definitions
- the invention relates to a method for preparing phosphatable workpieces for non-cutting cold forming by acid pickling, rinsing, drying and treating with acid, Reaction lubricants containing phosphate ions.
- Acidic reaction lubricants have an oily character and are characterized by the fact that they are next to an organic Lubricants contain ingredients that are required to form a Conversion coating on the surface of the to be formed Workpiece are capable (US-A-3 525 651, US-A-2 739 915, DE-B-21 02 295, EP-A-24 062, EP-A-25 236).
- the in practice by far the most important reaction lubricant contained as the conversion coating forming component phosphoric acid or Zinc phosphate.
- phosphoric acid Treatment of the workpieces to be formed essentially Iron phosphate layers, when using zinc phosphate containing reaction lubricants from conversion layers Zinc phosphate or zinc iron phosphate.
- the usually in Reaction lubricants applied by immersion generate on the
- the surface of the workpiece is an integral part Conversion coating, which ensures that when forming a high degree of separation of workpiece and forming tool takes place, on the other hand, a firm bond of the organic Lubricant is given on the workpiece surface.
- the first stages of treatment for the usual preparation of Workpieces, especially pipes, consist of the Bright annealing under protective gas at approx. 920 ° C, the subsequent one Pickling in hydrochloric acid or sulfuric acid and one if necessary multi-stage water flushing.
- a rust preventive such as borax, soda, Nitrite, phosphate or sodium hydroxide solution or mixtures thereof.
- the Drying is required because of acidic reaction lubricants are sensitive to constant water entry.
- the object of the invention is a method for preparation of phosphatable workpieces for non-cutting cold forming to provide using acidic reaction lubricants, which does not have the aforementioned disadvantages, in which the Workpieces in the process stage of treatment with the acid Reaction lubricants are introduced in a rust-free condition and with a perfect exposure to the acid Reaction lubricant without its disadvantageous Impairment is achievable.
- the task is solved by the procedure of the beginning mentioned type according to the invention in the manner is designed that the workpieces with before drying a solution that contains lactic acid and a pH below 3.
- Workpieces suitable for phosphating intended for cold forming consist in particular of steel in the form of wire, tube, Profiles, circular blanks etc., which can be pulled, cold extruded, Rolls etc. are formed.
- This layer is not only rust-proof, but also acts on the layer formation in the treatment with the acid Activating reaction lubricant.
- the adjustment of the pH value below 3 can be done with Lactic acid. However, for cost reasons it is expedient, in addition to adjusting the pH To use phosphoric acid and / or sulfuric acid.
- Phosphoric acid is preferred because the final applied Reaction lubricant contains phosphate ions and therefore with Rinsing solution entered inevitably, from the phosphoric acid originating phosphate ions are not alien.
- Another expedient embodiment of the invention exists in rinsing the workpieces with a solution that Lactic acid and phosphoric acid in a weight ratio of 1: 9 to 9: 1 contains. This configuration is under Consideration of both the layer quality and the Cost situation particularly advantageous.
- the rinse with the solution containing lactic acid can be carried out with a solution temperature of 20 to 90 ° C.
- the workpieces with a solution at a temperature of 60 to 80 ° C.
- Tubes of steel quality St34 / 2 bright annealed under protective gas at approx. 920 ° C were initially contained in a pickling solution of 50 ° C 150 g / l sulfuric acid 60 g / l Iron II for a period of 15 min. pickled and then rinsed in two stages with cascade-like rinsing water.
- the still wet tubes were rinsed with a solution according to the invention, the 10 g / l lactic acid 20 g / l phosphoric acid contained and had a pH of ⁇ 3.
- the temperature of the rinsing solution was 70 ° C. and the rinsing time was 3 minutes.
- the tubes were then allowed to air dry and treated with the residual moisture adhering in a conventional manner with an acidic reaction lubricant containing phosphate ions and formed by tube drawing.
- the pipes dried after rinsing showed nothing Rust attack and had a lactate layer containing iron oxide of a blue-violet appearance.
- the subsequent treatment with the reaction lubricant led to flawless Lubricant layers. Somehow The reaction lubricant was not adversely affected.
- tubes of the same quality were the same as above subject to the procedure described, but was carried out instead of rinsing with the solution containing lactic acid a third rinse with warm water.
Landscapes
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Lubricants (AREA)
- Metal Extraction Processes (AREA)
- Polarising Elements (AREA)
Description
150 g/l | Schwefelsäure |
60 g/l | Eisen II |
10 g/l | Milchsäure |
20 g/l | Phosphorsäure |
Claims (5)
- Verfahren zur Vorbereitung von phosphatierbaren Werkstücken für die spanlose Kaltumformung durch saures Beizen, Spülen, Trocknen und Behandeln mit sauren, Phosphationen enthaltenden Reaktionsschmiermitteln, dadurch gekennzeichnet, daß man die Werkstücke vor dem Trocknen mit einer Lösung spült, die Milchsäure enthält und einen pH-Wert unterhalb 3 aufweist.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die Werkstücke mit einer Lösung spült, die zusätzlich Phosphorsäure enthält.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man die Werkstücke mit einer Lösung spült, die 1 bis 50 g/l Milchsäure enthält.
- Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß man die Werkstücke mit einer Lösung spült, die Milchsäure und Phosphorsäure in einem Gewichtsverhältnis von 1 : 9 bis 9 : 1 enthält.
- Verfahren nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß man die Werkstücke mit einer Lösung einer Temperatur von 60 bis 80 °C spült.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19844391 | 1998-09-28 | ||
DE19844391A DE19844391C2 (de) | 1998-09-28 | 1998-09-28 | Verfahren zur Vorbereitung von Werkstücken für die Kaltumformung |
PCT/EP1999/006978 WO2000018983A1 (de) | 1998-09-28 | 1999-09-21 | Vorbereitung von werkstücken für die kaltumformung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1135543A1 EP1135543A1 (de) | 2001-09-26 |
EP1135543B1 true EP1135543B1 (de) | 2002-06-05 |
Family
ID=7882486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99969750A Expired - Lifetime EP1135543B1 (de) | 1998-09-28 | 1999-09-21 | Vorbereitung von werkstücken für die kaltumformung |
Country Status (6)
Country | Link |
---|---|
US (1) | US6482273B1 (de) |
EP (1) | EP1135543B1 (de) |
AT (1) | ATE218629T1 (de) |
DE (2) | DE19844391C2 (de) |
ES (1) | ES2178504T3 (de) |
WO (1) | WO2000018983A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI457433B (zh) * | 2008-01-30 | 2014-10-21 | Chemetall Gmbh | 將金屬表面施以一磷酸鹽層然後施以一潤滑劑層的方法 |
TWI457432B (zh) * | 2008-01-30 | 2014-10-21 | Chemetall Gmbh | 將金屬表面施以一含蠟的潤滑劑組成物的方法 |
TWI457431B (zh) * | 2008-01-30 | 2014-10-21 | Chemetall Gmbh | 將金屬表面施以一種潤滑劑組成物的方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB665993A (en) * | 1947-07-23 | 1952-02-06 | Plasco Ltd | Process and composition for producing a dyeable corrosion-resistant coating on zinc and zinc alloys |
DE975008C (de) * | 1952-08-06 | 1961-08-03 | American Chem Paint Co | Verfahren zur Herstellung von Phosphatueberzuegen auf Zink und dessen Legierungen |
DE2103086C3 (de) * | 1971-01-23 | 1979-11-15 | Metallgesellschaft Ag, 6000 Frankfurt | Verfahren zur Oberflächenbehandlung von Werkstücken aus Eisen und Stahl |
US3795548A (en) * | 1972-01-10 | 1974-03-05 | Oxy Metal Finishing Corp | Procedure for surface treatment of iron and steel |
JPH0696773B2 (ja) * | 1989-06-15 | 1994-11-30 | 日本ペイント株式会社 | 金属表面のリン酸亜鉛皮膜形成方法 |
US5624480A (en) * | 1993-04-07 | 1997-04-29 | Henkel Corporation | Composition and process for substitutionally plating zinciferous surfaces |
DE4433946A1 (de) * | 1994-09-23 | 1996-03-28 | Henkel Kgaa | Phosphatierverfahren ohne Nachspülung |
-
1998
- 1998-09-28 DE DE19844391A patent/DE19844391C2/de not_active Withdrawn - After Issue
-
1999
- 1999-09-21 AT AT99969750T patent/ATE218629T1/de not_active IP Right Cessation
- 1999-09-21 DE DE59901680T patent/DE59901680D1/de not_active Expired - Fee Related
- 1999-09-21 EP EP99969750A patent/EP1135543B1/de not_active Expired - Lifetime
- 1999-09-21 WO PCT/EP1999/006978 patent/WO2000018983A1/de active IP Right Grant
- 1999-09-21 ES ES99969750T patent/ES2178504T3/es not_active Expired - Lifetime
- 1999-09-21 US US09/787,043 patent/US6482273B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US6482273B1 (en) | 2002-11-19 |
WO2000018983A1 (de) | 2000-04-06 |
DE19844391A1 (de) | 2000-04-13 |
ES2178504T3 (es) | 2002-12-16 |
DE59901680D1 (de) | 2002-07-11 |
EP1135543A1 (de) | 2001-09-26 |
DE19844391C2 (de) | 2003-01-09 |
ATE218629T1 (de) | 2002-06-15 |
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