EP0769081A1 - Beschichtung von metalloberflächen mit kupfer oder kupferlegierungen - Google Patents
Beschichtung von metalloberflächen mit kupfer oder kupferlegierungenInfo
- Publication number
- EP0769081A1 EP0769081A1 EP95915176A EP95915176A EP0769081A1 EP 0769081 A1 EP0769081 A1 EP 0769081A1 EP 95915176 A EP95915176 A EP 95915176A EP 95915176 A EP95915176 A EP 95915176A EP 0769081 A1 EP0769081 A1 EP 0769081A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- copper
- alloys
- deposition
- biuret
- galvanic deposition
- 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.)
- Withdrawn
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
- C25D3/38—Electroplating: Baths therefor from solutions of copper
-
- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/38—Coating with copper
- C23C18/40—Coating with copper using reducing agents
Definitions
- the invention relates to a method for coating metal surfaces with copper or copper alloys from alkaline aqueous solutions of copper complexes.
- DE-A 34 04 270.9 describes an aqueous alkaline bath for the chemical electroless plating of copper, nickel, cobalt and their alloys, this bath containing a reducing agent, cyanides, and as complexing agents polyols and / or compounds of the biuret type .
- the problems of the prior art are solved by a new method for coating metal surfaces Copper or copper alloys from alkaline aqueous solution of copper complexes.
- the process according to the invention is characterized in that cyanide-free aqueous solutions of copper complex salts of the biuret are used for the electroless and / or galvanic deposition of copper or copper alloys.
- the copper complex salt of the biuret has been known for a long time.
- biuret is obtained by slowly heating urea to 150 to 160 ° C., taking up the reaction product in water and adding alkali and a little copper (II) salt solution, a characteristic violet-red color being obtained.
- urea first splits off ammonia and the isocyanic acid continues to react with urea to form biuret.
- the colored copper complex salt is formed from two molecules of biuret. In the same way, when an alkaline protein solution is mixed with a few drops of highly diluted copper (II) salt solution, a red to blue violet color occurs.
- biuret reaction is misleading in that the atomic grouping of the biuret, H 2 N-CO-NH-CO-NH 2 , is not present in proteins. Nevertheless, the complexes obtained in this way can also be used in a similar manner according to the invention.
- the metal surfaces to be coated with copper or copper alloys are less critical. However, since more noble metals than copper are predominantly coated in acidic solution, the method according to the invention essentially gains advantages in the coating of less noble metals. Accordingly, in a preferred embodiment of the present invention, the metal surfaces are selected from steel, hot-dip galvanized steel, iron, zinc, brass and aluminum and their alloys.
- copper alloys are preferably selected from copper-zinc alloys (brass, tombac), copper-tin alloys (bronze, speculum) and copper-cadmium alloy are of particular importance. While 20 to 50 g of free cyanide is usually contained in known alkaline electrolyte solutions which contain cyanide, it is an essential feature of the present invention that the aqueous solutions are cyanide-free.
- the copper complex salts of the biuret to be used according to the invention are therefore used in amounts of 1 g / 1 to 50 g / 1, in particular 15 g / 1 to 25 g / 1, of the electrolyte solution. If the lower limit of the amount of copper complex salt of the biuret to be used is undershot, a sufficient layer thickness cannot be obtained in an economically sensible time. However, if the amount of copper complex salt of the biuret in the aqueous solution is exceeded, it can lead to difficulties in the solubility of the complexes, which in turn leads to insufficient layer quality. Furthermore, an excessive deviation from the central elements leads to a strong passivation and coating of the anode surface and thus to a sharp drop in the conductivity.
- Electroless or galvanic deposition of copper or copper alloys from cyanide-free aqueous solutions of copper complex salts of the biuret can be carried out under the conditions customary in the prior art. For the purposes of the present invention, it is therefore particularly preferred to electroless or galvanically deposit copper or
- the desired layer thickness primarily determines the
- Deposition time and thus the residence time of the surface in the cyanide-free aqueous solution it is particularly preferred to electroless and / or electrodeposition of copper or copper alloys in the course of 10 to 15 minutes. to carry out. In the case of electroless deposition, this is within Time get a copper layer of a thickness of about 1 to 2 microns.
- Electroless deposition of copper in conjunction with galvanic deposition, makes it possible to provide even complex geometrically shaped objects with metallic surfaces with a dense coating even in Faraday cages.
- a number of further additives to aqueous electrolytes based on cyanides are known in the prior art and can also be used in the sense of the present invention.
- the most important additives or auxiliaries here are conductive salts, brighteners or wetting agents.
- particularly preferred conductive salts in the context of the present invention are potassium / sodium sulfate, preferably in amounts of 20 to 50 g / l.
- the cyanide electrolytes are preferably prepared with potassium salts, since their conductivity is greater than that of the corresponding sodium salts.
- the solubility of the anodes is also better when using potassium salts. According to the invention, it was found that sodium salts can be used more advantageously than potassium salts.
- rhodanides are added to cyanide electrolytes, which form a stable complex with copper and produce a shiny copper deposit.
- Other brighteners known in the prior art are, for example, butynediol or propyl alcohol. These additives are not required in the electrolytes according to the invention, which is in particular a wastewater-technical advantage of the process.
- the stable copper rhodanide complexes can hinder the complete precipitation of the copper.
- imidazole derivatives in particular imidazole chlorohydroxypropane, bisimidazole hydroxypropyl chloride and / or imidazole dioxichloropropylhydroxychloropropane, are excellent brighteners in the electrolytes according to the invention.
- pore formation can also be prevented by adding cation-active wetting agents (mostly quaternary ammonium compounds), as a result of which the copper deposits become darker. If wetting agents are present in the electrolyte, it is preferred to activate the copper deposit before applying further metal coatings.
- wetting agents are present in the electrolyte, it is preferred to activate the copper deposit before applying further metal coatings.
- the use of these additives is not absolutely necessary in the electrolytes according to the invention, since pore-free deposits can be obtained even without wetting agents.
- a further embodiment of the present invention consists in the objects with metallic surfaces, in particular with complicatedly shaped geometry, which have been coated with copper or copper alloys according to the aforementioned method.
- Example 2 In the same electrolyte bath as in Example 1, using a copper anode at the same temperature and for 15 minutes, but with a current density of 1.5 A / dm 2, a high-gloss layer of up to 10 ⁇ m was obtained.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Chemically Coating (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19944412295 DE4412295C1 (de) | 1994-04-08 | 1994-04-08 | Verfahren zum galvanischen Beschichten von Metalloberflächen mit Kupfer oder Kupferlegierungen |
DE4412295 | 1994-04-08 | ||
PCT/EP1995/001206 WO1995027812A1 (de) | 1994-04-08 | 1995-03-31 | Beschichtung von metalloberflächen mit kupfer oder kupferlegierungen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0769081A1 true EP0769081A1 (de) | 1997-04-23 |
Family
ID=6515022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95915176A Withdrawn EP0769081A1 (de) | 1994-04-08 | 1995-03-31 | Beschichtung von metalloberflächen mit kupfer oder kupferlegierungen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0769081A1 (de) |
DE (1) | DE4412295C1 (de) |
WO (1) | WO1995027812A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102758229A (zh) * | 2012-07-31 | 2012-10-31 | 淮安市曼蒂科技发展有限公司 | 一种无氰电刷镀铜液及其制备方法 |
DE102018127292A1 (de) * | 2018-10-31 | 2020-04-30 | Infinite Flex GmbH | Verfahren zum Abscheiden einer Metallschicht auf Aluminium |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3404270A1 (de) * | 1984-02-04 | 1985-08-08 | Schering AG, 1000 Berlin und 4709 Bergkamen | Waessriges alkalisches bad zur chemischen abscheidung von kupfer, nickel, kobalt und deren legierungen |
-
1994
- 1994-04-08 DE DE19944412295 patent/DE4412295C1/de not_active Expired - Fee Related
-
1995
- 1995-03-31 EP EP95915176A patent/EP0769081A1/de not_active Withdrawn
- 1995-03-31 WO PCT/EP1995/001206 patent/WO1995027812A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9527812A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE4412295C1 (de) | 1996-01-18 |
WO1995027812A1 (de) | 1995-10-19 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 19961109 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE |
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R17P | Request for examination filed (corrected) |
Effective date: 19961108 |
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R17P | Request for examination filed (corrected) |
Effective date: 19961109 |
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GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
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17Q | First examination report despatched |
Effective date: 20000621 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20001003 |