EP0827785B1 - Verfahren zur Herstellung von Schutzschichten auf Flacherzeugnissen aus Titanzink - Google Patents
Verfahren zur Herstellung von Schutzschichten auf Flacherzeugnissen aus Titanzink Download PDFInfo
- Publication number
- EP0827785B1 EP0827785B1 EP97114344A EP97114344A EP0827785B1 EP 0827785 B1 EP0827785 B1 EP 0827785B1 EP 97114344 A EP97114344 A EP 97114344A EP 97114344 A EP97114344 A EP 97114344A EP 0827785 B1 EP0827785 B1 EP 0827785B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- chromate
- zinc
- acid
- containing polymer
- 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.)
- Revoked
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/51—One specific pretreatment, e.g. phosphatation, chromatation, in combination with one specific coating
-
- 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
- C23C22/05—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 using aqueous solutions
- C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/53—Treatment of zinc or alloys based thereon
Definitions
- the invention relates to a method for producing Protective layers of uniform tint on rolled Flat products made of titanium zinc in the form of strips, sheets and strips for use in construction.
- titanium zinc initially reacts in the atmosphere with the formation of zinc oxide with the oxygen in the Air. It is formed by the action of rain and moisture then zinc hydroxide, which is caused by the reaction with the carbon dioxide the air into a dense, firmly adhering and water-insoluble Protective layer for basic zinc carbonate, the so-called Patina, is transformed. This protective layer is in generally responsible for the high corrosion resistance of the titanium zinc.
- titanium zinc consists of 0.06 up to 0.2% by weight titanium, max. 0.015% by weight aluminum, 0.08 to 1.0 % By weight copper, balance zinc 99.995% by weight.
- Sulfur dioxide affects at a relative humidity of over 70% the formation of the protective layer of the Titanium zinc.
- the protective layer complements the removal or Damage due to consumption corresponding to this removal of zinc.
- the aggressiveness of the local atmosphere is different and thus the intensity of the atmospheric Corrosion.
- the formation of the protective layer from basic zinc carbonate needs one depending on the season, climate and environmental conditions more or less long period, the training of Zinc carbonate layer is not done regularly and thereby optically negative impression arises.
- Claims 2 to 8 preferably contain and / or others Design options of the method according to claim 1.
- the speed of the pickling reaction is essentially dependent on the free acid content.
- the reduction of nitric acid is the dominant reaction and prevents one Hydrogen development.
- Another influence on the pickling result exerts the ratio of acidity.
- a tape made of titanium zinc 0.8 mm thick and 600 mm Width is achieved by rinsing with an alkaline degreasing solution at a temperature of approx. 60 ° C and a pressure of degreased approx. 2.5 bar and then in a sink with water with a temperature of 65 ° C and a pressure of 2.5 bar hosed.
- the belt is brushed in the last rinse stage.
- the belt is then used in a pickling line a pickling bath temperature of approx. 50 ° C, containing a mixed acid from approx. 30 to 60 g / l sulfuric acid and approx. 20 to 50 g / l nitric acid and approx.
- the Belt emerging from the pickling line is described as above rinsed with water. After removal of the residual water is on the tape by rolling a mixture of 95% polymers and 5% Chromate solution applied and this application at approx. 80 ° C dried.
- the layer thickness of the film produced is dry condition 1.5 ⁇ m. That is under the light microscope Layer not recognizable.
- a condensation test was carried out with two belt sections DIN 50017 (8 hours including warming up at 40 ° C and 100% humidity, then 16 hours cooling with the chamber open) carried out. After repeating this test 10 times no formation of zinc hydroxide was found. On simultaneously tested titanium zinc sheet, which only was pickled by the process according to DE-C-2 757 592, showed extensive formation of zinc hydroxide.
- the deep-drawing behavior of the strip sections treated according to the invention was tested by pulling out the two band sections Blanks were cut using a press Elbow half shells were deep drawn. There were both deep-drawn and non-oiled boards deep-drawn; spalling the passivation layer was not visible anywhere.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Laminated Bodies (AREA)
Description
Claims (9)
- Verfahren zur Herstellung von Schutzschichten einheitlicher Farbtönung durch Beizen auf gewalzten Flacherzeugnissen aus Titanzink, in der Form von Bändern, Blechen oder Streifen zur Verwendung im Bauwesen, dadurch gekennzeichnet, daß die Flacherzeugnisse in einem Beizbad mit Schwefelsäure und Salpetersäure enthaltender Mischsäure gebeizt und nach dem Spülen durch Auftragen eines chromathaltigen Polymers unter Bildung einer Schutzschicht passiviert werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Mischsäure 2 bis 10 Vol.-% Schwefelsäure und 2 bis 10 Vol.% Salpetersäure enthält, wobei das Mischungsverhältnis von Schwefelsäure zu Salpetersäure < 3 ist und der Gehalt an freier Säure 25 bis 100 g/l beträgt.
- Verfahren nach Ansprüche 1 und 2 , dadurch gekennzeichnet, daß das Beizbad 25 bis 80 g/l Zink-Ionen enthält.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das chromhaltige Polymer aus einer Mischung von 65 bis 98 Polymer und 2 bis 35 % Chromat besteht.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das organische Polymer aus einem Gemisch von Styrol-Acrylat, aliphatischen Polyestern und Polyurethan besteht.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Beizbad einer Temperatur von 30 - 80 °C aufweist.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Spülwasser eine Temperatur von 20 bis 80 °C aufweist.
- Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das chromathaltig Polymer durch Aufsprühen, Tauchen, Walzen, Rollen oder dergl. Maßnahmen aufgetragen wird.
- Flacherzeugnisse aus Titanzink behandelt nach einem der Ansprüche 1 bis 8, gekennzeichnet durch eine Schutzschicht aus chromathaltigem Polymer mit einer Dicke von 0,4 bis 3,0 µm, vorzugsweise 1 bis 2 µm, wobei die Chromatauflage 5 bis 40 mg/m2 beträgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19636370A DE19636370B4 (de) | 1996-09-09 | 1996-09-09 | Verfahren zur Herstellung von Schutzschichten auf Flacherzeugnissen aus Titanzink und Flacherzeugnis |
DE19636370 | 1996-09-09 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0827785A2 EP0827785A2 (de) | 1998-03-11 |
EP0827785A3 EP0827785A3 (de) | 2000-01-12 |
EP0827785B1 true EP0827785B1 (de) | 2003-02-26 |
Family
ID=7804917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97114344A Revoked EP0827785B1 (de) | 1996-09-09 | 1997-08-20 | Verfahren zur Herstellung von Schutzschichten auf Flacherzeugnissen aus Titanzink |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0827785B1 (de) |
DE (2) | DE19636370B4 (de) |
DK (1) | DK0827785T3 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10156475A1 (de) * | 2001-11-16 | 2003-06-05 | Rheinzink Gmbh | Verfahren zur Herstellung von dunklen Schutzschichten auf Flacherzeugnissen aus Titanzink |
US6838572B2 (en) | 2002-09-30 | 2005-01-04 | Degussa Ag | Process for the epoxidation of olefins |
DE102006051384A1 (de) * | 2006-10-27 | 2008-04-30 | Seppeler Holding Und Verwaltungs Gmbh & Co. Kg | Verfahren zur Vorbewitterung von Metallteilen mit einer vorwiegend aus Zink bestehenden Oberfläche |
IT1393946B1 (it) * | 2009-04-21 | 2012-05-17 | Np Coil Dexter Ind Srl | Processo di trattamento in continuo di patinatura/satinatura chimica di leghe zinco-titanio |
DE102010025707A1 (de) * | 2010-06-30 | 2012-01-05 | Rheinzink Gmbh & Co. Kg | Verfahren zur Herstellung von Schutzschichten auf Flacherzeugnissen aus Titanzink |
IT201900016901A1 (it) * | 2019-09-20 | 2021-03-20 | Vimar Spa | Metodo di produzione di placca elettrica metallica, e relativa placca |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2757592C2 (de) * | 1977-12-23 | 1985-03-28 | Rheinzink GmbH, 4354 Datteln | Verfahren zur Herstellung von Deckschichten auf aus Zink-Kupfer-Titan-Legierungen bestehenden Formkörpern |
-
1996
- 1996-09-09 DE DE19636370A patent/DE19636370B4/de not_active Expired - Lifetime
-
1997
- 1997-08-20 DE DE59709373T patent/DE59709373D1/de not_active Revoked
- 1997-08-20 DK DK97114344T patent/DK0827785T3/da active
- 1997-08-20 EP EP97114344A patent/EP0827785B1/de not_active Revoked
Also Published As
Publication number | Publication date |
---|---|
DE19636370A1 (de) | 1998-03-12 |
EP0827785A3 (de) | 2000-01-12 |
EP0827785A2 (de) | 1998-03-11 |
DK0827785T3 (da) | 2003-06-23 |
DE19636370B4 (de) | 2005-04-14 |
DE59709373D1 (de) | 2003-04-03 |
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