EP0757121B1 - Alkalisches oder neutrales Bad zur galvanischen Abscheidung von Palladium oder Legierungen des Palladiums - Google Patents
Alkalisches oder neutrales Bad zur galvanischen Abscheidung von Palladium oder Legierungen des Palladiums Download PDFInfo
- Publication number
- EP0757121B1 EP0757121B1 EP96112583A EP96112583A EP0757121B1 EP 0757121 B1 EP0757121 B1 EP 0757121B1 EP 96112583 A EP96112583 A EP 96112583A EP 96112583 A EP96112583 A EP 96112583A EP 0757121 B1 EP0757121 B1 EP 0757121B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bath
- palladium
- per liter
- grams per
- nitrite
- 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
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/567—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of platinum group metals
-
- 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
- C25D3/50—Electroplating: Baths therefor from solutions of platinum group metals
Definitions
- the invention relates to a bath for the electrodeposition of palladium or palladium alloys with those specified in the preamble of claim 1 Characteristics.
- a bath is known from DE-31 47 823 A1.
- Palladium baths and palladium alloy baths, which use the palladium as a diammino-dichloro complex are capable of relatively thick, ductile layers to separate. However, the gloss level of such layers is for most applications not sufficient in the decorative area.
- DE-31 47 823 are also palladium baths and palladium alloy baths known which uses the palladium as an amino nitrite complex, e.g. as a palladium-diammino-dinitrite complex contain.
- Such baths based on a nitrite complex are able to deposit shiny layers, but with lower ductility; leave ductile layers with layers of a few ⁇ m from such baths, in which the palladium is contained as a nitrite complex, do not deposit.
- the object of the present invention is the composition of a bath to indicate from which palladium layers or palladium alloy layers can be separated, which is not only by high gloss distinguish, but are also ductile.
- a bath which is called the palladium Diammino dichloro complex contains, deposit layers that are not only relative thick and ductile, but also high-gloss without the addition of a conventional gloss agent if the bath, based on the amount of palladium used, contains a relatively small amount of a nitrite, which in particular is added as sodium nitrite or potassium nitrite.
- the nitrite is, however not contained in the bath in the form of free ions, rather it displaces one equivalent amount of chloride from the palladium-diammino-dichloro complex below Formation of a palladium-aminonitrite complex, so that the palladium in the bath mainly as a diammino-dichloro complex and the smaller one Part is contained as a diammino-dinitrite complex, the bath being a corresponding Contains free chlorides.
- the bath contains a total of 2 to 25 g / l, preferably 5 to 15 g / l of palladium and 0.01 mol to 1 mol, preferably 0.1 to 0.3 mol nitrite per mol palladium.
- Shiny and ductile layers are not only obtained when depositing pure palladium, but also when depositing palladium alloys.
- the alloy metal allows gloss and ductility to be influenced favorably.
- Nickel is particularly suitable as an alloy metal.
- cobalt and in particular zinc which the bath preferably contains as alloy components in an amount not exceeding 50% by weight of the palladium, are also suitable.
- the optimal zinc content of the bath is between 0.3 and 0.6 g / l.
- the zinc can be added, for example, as zinc sulfate; to bind the zinc complex, a complexing agent customary for this purpose can be added.
- Phosphonic acids or a complex-forming amine compound such as EDTA or NTA are suitable as complexing agents.
- a particularly suitable complexing agent for zinc is 1-hydroxy-ethane-1,1-diphosphonic acid, which is preferably in amounts of 5 g / l to 50 g / l is included in the bath.
- the required conductive salt can be selected from the group commonly used in electroplating Conductive salts can be selected.
- the ammonium, Sodium and potassium salts of sulfuric acid and hydrochloric acid, especially ammonium chloride and ammonium sulfate, which in amounts of 5 to 300 g / l in the bath can be included.
- the bath be operated neutral or weakly alkaline can, preferably with a pH between 6.8 and 8, especially at a pH of 7.5.
- the pH of the neutral or weakly alkaline bath does not necessarily have to be stabilized by a buffer substance, although the addition of a buffer substance is preferred.
- An additive is particularly suitable from 5 to 40 g / l, in particular 25 to 35 g / l boric acid, with which the desired pH is attainable. If necessary, can be used to neutralize Boric acid ammonia can be added.
- the bath can use nicotinic acid, nicotinic acid amide or similar compounds known for this purpose can be added.
- Wetting agents can also be added to the bath. Suitable as wetting agents complex organic phosphate or sulfate esters, especially polyoxyethylene fatty alcohol ether or sodium lauryl sulfate, which the bath expediently in an amount of 0.1 to 5 g / l, preferably 0.5 to 2 g / l be added.
- Such a bath works satisfactorily at temperatures between room temperature and 80 ° C., preferably between 50 and 60 ° C., with current densities between 0.1 and 1.5 A / dm 2 , in particular with a current density of approximately 1 A / dm 2 .
- composition of the bath Palladium (as palladium diammino dichloride Pd (NH 3 ) 2 Cl 2 ) 10 g / l (NH 4 ) 2 SO 4 50 g / l NTA 30 g / l Zinc (as zinc sulfate) 0.5 g / l Nicotinic acid 5 g / l NaNO 2 2 g / l
- Wetting agent an organic sulfate ester 1 g / l Add NH 4 OH until a pH of 8.0 is reached Fill up to 1.0 liters of water.
- composition of the bath Palladium (as palladium diammino dichloride) 5 g / l NH 4 Cl 80 g / l Boric acid 20 g / l 1-hydroxy-ethane-1,1-diphosphonic acid 30 g / l Nicotinamide 15 g / l Cobalt (as cobalt sulfate) 3 g / l NaNO 2 0.5 g / l Add NH 4 OH until pH 7.0 is reached, Fill up to 1.0 liters of water.
- composition of the bath Palladium (as palladium diammino dichloride) 8 g / l NH 4 Cl 40 g / l (NH 4 ) 2 SO 4 40 g / l Boric acid 30 g / l Nicotinamide 10 g / l NaNO 2 1 g / l Add NH 4 OH until a pH of 8.5 is reached, Fill up to 1.0 liters of water.
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)
- Conductive Materials (AREA)
Description
5 g/l bis 50 g/l im Bad enthalten ist.
Zusammensetzung des Bades : | |
Palladium (als Palladium-diammino-dichlorid Pd(NH3)2Cl2) | 10 g/l |
(NH4)2 SO4 | 50 g/l |
NTA | 30 g/l |
Zink (als Zinksulfat) | 0,5 g/l |
Nikotinsäure | 5 g/l |
NaNO2 | 2 g/l |
Netzmittel: ein organischer Sulfatester | 1 g/l |
NH4 OH zugeben, bis ein pH-Wert von 8,0 erreicht ist Wasser auf 1,0 Liter auffüllen. |
Zusammensetzung des Bades : | |
Palladium (als Palladium-diammino-dichlorid) | 5 g/l |
NH4 Cl | 80 g/l |
Borsäure | 20 g/l |
1-Hydroxy-ethan-1.1-diphosphonsäure | 30 g/l |
Nikotinamid | 15 g/l |
Kobalt (als Kobaltsulfat) | 3 g/l |
NaNO2 | 0,5 g/l |
NH4 OH zugeben, bis ein pH-Wert von 7,0 erreicht ist, Wasser auf 1,0 Liter auffüllen. |
Zusammensetzung des Bades : | |
Palladium (als Palladium-diammino-dichlorid) | 8 g/l |
NH4Cl | 40 g/l |
(NH4)2 SO4 | 40 g/l |
Borsäure | 30 g/l |
Nikotinamid | 10 g/l |
NaNO2 | 1 g/l |
NH4 OH zugeben, bis ein pH-Wert von 8,5 erreicht ist, Wasser bis auf1,0 Liter auffüllen. |
Claims (14)
- Alkalisches oder neutrales Bad zur galvanischen Abscheidung von Palladium oder Legierungen des Palladiums, welches2 bis 25 g/l Palladium als Diammino-dichloro-Palladium - Komplex, wenigstens ein Leitsalz,vorzugsweise auch eine Puffersubstanz, ein Glanzmittel und ein Netzmittel, sowie Wasser enthält,
- Bad nach Anspruch 1, dadurch gekennzeichnet, daß es 5 bis 15 g/l Palladium enthält.
- Bad nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß es 0,1 Mol bis 0,3 Mol, vorzugsweise 0,2 Mol Nitrit pro Mol Palladium enthält.
- Bad nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Nitrit als Kaliumnitrit oder Natriumnitrit zugegeben wird.
- Bad nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß es als Legierungskomponente für das Palladium Kobalt, Nickel oder Zink in einer 50 Gew-% des Palladiums nicht überschreitenden Menge enthält.
- Bad nach Anspruch 5, dadurch gekennzeichnet, daß als Komplexbildner für die Legierungskomponente des Palladiums eine Phosphonsäure oder eine Aminverbindung wie z. B. Ethylendiamintetraessigsäure (EDTA) oder Nitrilotriessigsäure (NTA) vorgesehen ist.
- Bad nach Anspruch 6, dadurch gekennzeichnet, daß es als Komplexbildner für das Zink 0,5 bis 50 g/l 1-Hydroxy-ethan-1.1-diphosphonsäure enthält.
- Bad nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß es 0,1 bis 10 g/l Zink als Zinksulfat enthält.
- Bad nach Anspruch 8, dadurch gekennzeichnet, daß es 0,3 bis 0,6 g/l Zink enthält.
- Bad nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß es als Leitsalz 5 bis 300 g/l Ammoniumchlorid und/oder 5 bis 300 g/l Ammoniumsulfat enthält.
- Bad nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß es als pH-Puffer 5 bis 40 g/l, vorzugsweise 25 bis 35 g/l Borsäure enthält.
- Bad nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß es nur schwach alkalisch ist, mit einem pH-Wert zwischen 6,8 und 8, vorzugsweise 7,5.
- Bad nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß es als Glanzmittel 0,1 bis 30 g/l, vorzugsweise 5 bis 15 g/l Nikotinsäure oder Nikotinsäureamid enthält.
- Bad nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß es als Netzmittel 0,1 bis 5 g/l, vorzugsweise 0,5 bis 2 g/l, eines organischen Phosphatesters oder Sulfatesters enthält.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19528800 | 1995-08-04 | ||
DE19528800A DE19528800C2 (de) | 1995-08-04 | 1995-08-04 | Alkalisches oder neutrales Bad zur galvanischen Abscheidung von Palladium oder Legierungen des Palladiums |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0757121A1 EP0757121A1 (de) | 1997-02-05 |
EP0757121B1 true EP0757121B1 (de) | 1999-02-24 |
Family
ID=7768770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96112583A Expired - Lifetime EP0757121B1 (de) | 1995-08-04 | 1996-08-03 | Alkalisches oder neutrales Bad zur galvanischen Abscheidung von Palladium oder Legierungen des Palladiums |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0757121B1 (de) |
AT (1) | ATE176935T1 (de) |
DE (2) | DE19528800C2 (de) |
ES (1) | ES2131368T3 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19803818A1 (de) * | 1997-11-15 | 1999-05-27 | Doduco Gmbh | Elektrolytisches Bad zum Abscheiden von Palladium und von Legierungen des Palladiums |
CN1249270C (zh) * | 1999-10-27 | 2006-04-05 | 小岛化学药品株式会社 | 钯镀液 |
EP2581470B1 (de) | 2011-10-12 | 2016-09-28 | ATOTECH Deutschland GmbH | Stromlose palladiumplattierungsbadzusammensetzung |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3147823A1 (de) * | 1980-12-11 | 1982-06-24 | 48089 Warren Mich. Hooker Chemicals & Plastics Corp. | "bad zur galvanischen abscheidung von palladium oder palladiumlegierungen und ein verfahren zur abscheidung von palladium oder palladiumlegierungen mit diesem bad" |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD290546A7 (de) * | 1989-09-29 | 1991-06-06 | Saxonia Ag,De | Verfahren zur herstellung von diammindinitropalladium (ii) |
-
1995
- 1995-08-04 DE DE19528800A patent/DE19528800C2/de not_active Expired - Fee Related
-
1996
- 1996-08-03 AT AT96112583T patent/ATE176935T1/de not_active IP Right Cessation
- 1996-08-03 DE DE59601331T patent/DE59601331D1/de not_active Expired - Lifetime
- 1996-08-03 EP EP96112583A patent/EP0757121B1/de not_active Expired - Lifetime
- 1996-08-03 ES ES96112583T patent/ES2131368T3/es not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3147823A1 (de) * | 1980-12-11 | 1982-06-24 | 48089 Warren Mich. Hooker Chemicals & Plastics Corp. | "bad zur galvanischen abscheidung von palladium oder palladiumlegierungen und ein verfahren zur abscheidung von palladium oder palladiumlegierungen mit diesem bad" |
Also Published As
Publication number | Publication date |
---|---|
EP0757121A1 (de) | 1997-02-05 |
DE19528800C2 (de) | 1999-05-06 |
ES2131368T3 (es) | 1999-07-16 |
DE19528800A1 (de) | 1997-05-15 |
DE59601331D1 (de) | 1999-04-01 |
ATE176935T1 (de) | 1999-03-15 |
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