EP1175518B1 - Legierungsbeschichtung von grauguss - Google Patents
Legierungsbeschichtung von grauguss Download PDFInfo
- Publication number
- EP1175518B1 EP1175518B1 EP00936711A EP00936711A EP1175518B1 EP 1175518 B1 EP1175518 B1 EP 1175518B1 EP 00936711 A EP00936711 A EP 00936711A EP 00936711 A EP00936711 A EP 00936711A EP 1175518 B1 EP1175518 B1 EP 1175518B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- bath
- nickel
- zinc
- bath according
- 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
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc
Definitions
- the invention relates to an electroplated coating of castings, in particular Cast iron parts.
- Castings are used for surface treatment, especially as corrosion protection with various alloys, such as a zinc-nickel alloy electroplated.
- various alloys such as a zinc-nickel alloy electroplated.
- the direct coating of the cast body takes place in the prior art exclusively in the acidic range. tries with alkaline baths have shown that there are no satisfactory ones Metal deposit on the gray cast iron surface.
- Acid zinc-nickel alloy electroplating processes work with acid Electrolyte bath such as sulfate bath, chloride bath, acetate bath or sulfamate bath. Such one Bad is described in Japanese Patent Laid-Open No. 58-39236.
- a disadvantage of such acid baths is the poorer metal distribution and the strong corrosion effect of the electrolyte on the galvanic system and the surrounding.
- the invention is based on the object, a galvanotechnical To provide coating processes for castings, in particular gray castings, with which a direct application of a galvanic layer in an alkaline bath is possible is.
- the invention solves the problem with a system according to claim 1.
- the invention thus enables an alkaline direct coating of castings with Zn, ZnFe; ZnNi, ZnCo, ZnSn, ZnMn or similar alloys.
- N-benzyl nicotinate betaine in one
- the order of magnitude between 0.01 and 20 g / l is a zinc-nickel layer with a more homogeneous layer Nickel distribution on the cast body possible.
- N-benzyl nicotinate betaine in one
- the order of magnitude between 0.01 and 20 g / l is a zinc-nickel layer with a more homogeneous layer Nickel distribution on the cast body possible.
- As Complexing agent polyethyleneimine and in particular tetraethylene pentamine used, to achieve a complexation of the ions in the bathroom. Similar Results can also be seen with other homologs, such as triethylene tetramine or reach pentaethylene hexamine.
- the bath according to the invention is preferably with insoluble nickel anodes operated.
- anode of the bath from the alkaline electrolyte is separated.
- This can be done, for example, by means of a ion exchange membrane can be realized.
- a corresponding device is described in German Offenlegungsschrift 198 34 353, which is hereby Becomes part of the present application.
- undesirable side reactions, especially cyanide formation avoided. Avoiding cyanide is not just environmental Advantages, but also an impact on performance of the bath, since complexation of zinc / nickel by cyanide is avoided is and the usual compensatory release of nickel is unnecessary.
- the subsequent surface treatment can be carried out with a bath of the following composition: approach chemical formula Area 12 g / l zinc oxide (ZnO) 5 to 20 g / l 9 g / l nickel sulfate (NiSO 4 * 6H 2 O) 4 to 20 g / l 150 g / l sodium hydroxide (NaOH) 50 to 250 g / l 24 g / l tetraethylenepentamine (C 8 H 23 N 5 ) 4 to 200 g / l 0.2 g / l N-benzyl nicotinate betaine (C 13 H 11 NO 2 ) 0.01 to 20 g / l bath temperature 35 +/- 1 ° C anodes nickel Nickel in the precipitation 12 to 16% nickel Cathodic current density 0.1 to 8 A / dm 2 Cathodic current efficiency 40 to 90%
- the appearance and the nickel distribution depending on the current density correspond a technical coating of the cast body.
- the addition of the Coating metals are made by dissolving zinc, zinc oxide and / or zinc salts and addition of nickel salts such as nickel sulfate, nickel sulfamate and / or Nickel chloride. Using tetraethylene pentamine gives a current efficiency achieved from 40 to 90% depending on the zinc content.
- N-benzyl nicotinate betaine makes it optically demanding Gloss effect achieved with homogeneous nickel distribution on the cast body.
- the bath described can be used as a drum or rack bath. at a particularly preferred electroplating bath with a zinc-nickel ratio of 5: 1 with, for example, 10 g / l zinc to 2 g / l nickel or 4 g / l zinc 0.8 g / l nickel worked.
- the zinc concentration should not fall below 4 g / l.
- the preferred NaOH concentration is between 75 and 200 g / l.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Physical Vapour Deposition (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
Ansatz | Chemikalie | Formel | Bereich |
12 g/l | Zinkoxid | (ZnO) | 5 bis 20 g/l |
9 g/l | Nickelsulfat | (NiSO4*6H2O) | 4 bis 20 g/l |
150 g/l | Natriumhydroxid | (NaOH) | 50 bis 250 g/l |
24 g/l | Tetraethylenpentamin | (C8H23N5) | 4 bis 200 g/l |
0,2 g/l | N-Benzyl-nicotinat-betain | (C13H11NO2) | 0,01 bis 20 g/l |
Badtemperatur | 35 +/- 1°C |
Anoden | Nickel |
Nickel im Niederschlag | 12 bis 16% Nickel |
Kathodische Stromdichte | 0,1 bis 8 A/dm2 |
Kathodische Stromausbeute | 40 bis 90% |
Claims (12)
- Galvanotechnisches Bad zur Beschichtung von Gußteilen, gekennzeichnet durch die Verwendung eines Polyethylenimins und von N-Benzyl-nicotinat-betain im alkalischen Milieu.
- Bad nach Anspruch 1, gekennzeichnet durch eine unlösliche Nickelanode.
- Bad nach Anspruch 1 oder 2, gekennzeichnet durch die Verwendung von Tetraethylenpentamin als Polyethylenimin-Zusatz.
- Bad nach einem der vorhergehenden Ansprüche, gekennzeichnet durch die Verwendung von Triethylentetramin, Tetraethylenpentamin oder Pentaethylenhexamin.
- Bad nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Anode von dem alkalischen Elektrolyten durch eine Membran getrennt ist.
- Bad nach einem der vorhergehenden Ansprüche, gekennzeichnet durch ein Zink-Nickel-Verhältnis von 5:1.
- Bad nach einem der vorhergehenden Ansprüche, gekennzeichnet durch eine Polyethyleniminkonzentration von 4 bis 200 g/l.
- Bad nach einem der vorhergehenden Ansprüche, gekennzeichnet durch eine NaOH-Konzentration von 50 bis 250 g/l.
- Verfahren zur Beschichtung von Gußkörpem in einem Bad nach Anspruch 1, dadurch gekennzeichnet, daß eine Zink-Nickelschicht unmittelbar auf den Gußkörper aufgebracht wird.
- Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß der Beschichtung eine Ultraschall-Heißentfettung vorgeschaltet wird.
- Verfahren nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß der Beschichtung eine Heißentfettung vorgeschaltet wird.
- Verfahren nach Anspruch 9, 10 und/oder 11, dadurch gekennzeichnet, daß der Beschichtung eine elektrolytische Entfettung mit kathodischem Strom vorgeschaltet wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19920394A DE19920394A1 (de) | 1999-05-04 | 1999-05-04 | Legierungsbeschichtung von Grauguß |
DE19920394 | 1999-05-04 | ||
PCT/EP2000/003994 WO2000066812A1 (de) | 1999-05-04 | 2000-05-04 | Legierungsbeschichtung von grauguss |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1175518A1 EP1175518A1 (de) | 2002-01-30 |
EP1175518B1 true EP1175518B1 (de) | 2002-09-04 |
Family
ID=7906873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00936711A Expired - Lifetime EP1175518B1 (de) | 1999-05-04 | 2000-05-04 | Legierungsbeschichtung von grauguss |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1175518B1 (de) |
AT (1) | ATE223524T1 (de) |
AU (1) | AU5211300A (de) |
DE (2) | DE19920394A1 (de) |
ES (1) | ES2182804T3 (de) |
PT (1) | PT1175518E (de) |
WO (1) | WO2000066812A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10035102B4 (de) * | 2000-07-19 | 2005-05-04 | Dr.-Ing. Max Schlötter GmbH & Co KG | Verfahren zur Beschichtung von Bauteilen aus gehärtetem Stahl oder Eisenguss mit Zink-Nickel-Legierungen und mit diesem Verfahren erhältliche beschichtete Substrate |
EP1870495A1 (de) * | 2006-06-21 | 2007-12-26 | Atotech Deutschland Gmbh | Wässriges alkalisches cyanidfreies Bad zur galvanischen Abscheidung von Zink- und Zinklegierungsüberzügen |
DE102007002321B4 (de) | 2007-01-16 | 2018-07-05 | Volkswagen Ag | Schraubenfeder mit Korrosionsschutz |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3681211A (en) * | 1970-11-23 | 1972-08-01 | Enequist Chem Co Inc The | Electroplating a black nickel-zinc alloy deposit |
FR2433061A1 (fr) * | 1978-08-08 | 1980-03-07 | Popescu Francine | Bain alcalin pour l'electrodeposition du zinc brillant |
DE3121016C2 (de) * | 1981-05-27 | 1986-07-17 | G. P. - Chemie GmbH, 5650 Solingen | Polymeres Zusatzmittel für galvanische Zinkbäder auf Basis von Polyalkyleniminen, Verfahren zur Herstellung desselben sowie wäßrig-alkalisches, cyanidfreies Zinkbad enthaltend dasselbe |
DE3712511C3 (de) * | 1986-04-14 | 1995-06-29 | Dipsol Chem | Alkalisches cyanidfreies Elektroplattierungsbad und Verwendung dieses Bades |
US5194140A (en) * | 1991-11-27 | 1993-03-16 | Macdermid, Incorporated | Electroplating composition and process |
DE19848467C5 (de) * | 1998-10-21 | 2006-04-27 | Walter Hillebrand Gmbh & Co. Kg Galvanotechnik | Alkalisches Zink-Nickelbad |
-
1999
- 1999-05-04 DE DE19920394A patent/DE19920394A1/de not_active Withdrawn
-
2000
- 2000-05-04 WO PCT/EP2000/003994 patent/WO2000066812A1/de active IP Right Grant
- 2000-05-04 PT PT00936711T patent/PT1175518E/pt unknown
- 2000-05-04 DE DE50000458T patent/DE50000458D1/de not_active Expired - Fee Related
- 2000-05-04 EP EP00936711A patent/EP1175518B1/de not_active Expired - Lifetime
- 2000-05-04 AU AU52113/00A patent/AU5211300A/en not_active Abandoned
- 2000-05-04 ES ES00936711T patent/ES2182804T3/es not_active Expired - Lifetime
- 2000-05-04 AT AT00936711T patent/ATE223524T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
AU5211300A (en) | 2000-11-17 |
WO2000066812A1 (de) | 2000-11-09 |
DE19920394A1 (de) | 2000-11-16 |
PT1175518E (pt) | 2003-01-31 |
EP1175518A1 (de) | 2002-01-30 |
DE50000458D1 (de) | 2002-10-10 |
ES2182804T3 (es) | 2003-03-16 |
ATE223524T1 (de) | 2002-09-15 |
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