CH445246A - Process for the electrolytic application of a shiny coating made of gold or a gold alloy - Google Patents
Process for the electrolytic application of a shiny coating made of gold or a gold alloyInfo
- Publication number
- CH445246A CH445246A CH1207160A CH1207160A CH445246A CH 445246 A CH445246 A CH 445246A CH 1207160 A CH1207160 A CH 1207160A CH 1207160 A CH1207160 A CH 1207160A CH 445246 A CH445246 A CH 445246A
- Authority
- CH
- Switzerland
- Prior art keywords
- gold
- sep
- coating made
- electrolytic application
- shiny coating
- Prior art date
Links
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims description 14
- 239000010931 gold Substances 0.000 title claims description 14
- 229910052737 gold Inorganic materials 0.000 title claims description 14
- 239000011248 coating agent Substances 0.000 title claims description 8
- 238000000576 coating method Methods 0.000 title claims description 8
- 238000000034 method Methods 0.000 title claims description 7
- 229910001020 Au alloy Inorganic materials 0.000 title claims description 6
- 239000003353 gold alloy Substances 0.000 title claims description 6
- 238000005868 electrolysis reaction Methods 0.000 claims description 6
- 229910021645 metal ion Inorganic materials 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 claims description 4
- 229910001385 heavy metal Inorganic materials 0.000 claims description 4
- 150000007524 organic acids Chemical class 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 150000004696 coordination complex Chemical class 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 2
- 239000001509 sodium citrate Substances 0.000 description 2
- WXLSIVAACGPAMC-UHFFFAOYSA-N CN(CCO)C.[Ni] Chemical compound CN(CCO)C.[Ni] WXLSIVAACGPAMC-UHFFFAOYSA-N 0.000 description 1
- 241000982822 Ficus obtusifolia Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 239000010930 yellow gold Substances 0.000 description 1
- 229910001097 yellow gold Inorganic materials 0.000 description 1
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
- C25D3/62—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of gold
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)
Description
(Zusatzpatent zum Hauptpatent 384 972) Verfahren zum elektrolytischen Aufbringen eines glänzenden Überzuges aus Gold oder einer Goldlegierung Gegenstand des Hauptpatentes ist ein Verfahren zum elektrolytischen Aufbringen eines glänzenden Überzuges aus Gold oder einer Goldlegierung, das dadurch gekenn zeichnet ist, dass man als Elektrolytbad eine Lösung verwendet, die je Liter 10 bis 150 g einer schwachen organischen Säure,
1 bis 15 g Gold in Form eines Cyanoaurates und bis 50 g/1 mindestens eines weiteren Schwermetalles in Form eines löslichen Metallsalzes enthält und auf einen pH-Wert von 3 bis 5 eingestellt ist.
Nach dem Verfahren des Hauptpatentes liefert das Metallsalz Ionen, welche unter den Elektrolysebedin- gungen reduziert und mit dem Gold ausgefällt werden, wobei ein glänzender, heller Goldüberzug oder Gold legierungsüberzug auf dem fertigen Produkt gebildet wird.
Es ist nun gefunden worden, dass sehr gute Resul tate erhalten werden, wenn man diese Ionenform des Metallsalzes dem Bad in Form eines löslichen Metall komplexes oder eines Chelates zusetzt.
Das erfindungs- gemässe Verfahren zum elektrolytischen Aufbringen eines glänzenden Überzuges aus Gold oder einer Goldlegierung ist daher dadurch gekennzeichnet, dass man als Elektrolytbad eine Lösung verwendet, die pro Liter 10 bis 150 g einer schwachen organischen Säure, 1 bis 15 Gold g in Form eines Cyanoaurates und bis 150 g mindestens eines weiteren Schwermetalles in Form einer Komplexverbindung, die unter Elektrolysebedingungen Metallionen freigibt, enthält und auf einen pH von 3 bis 5 eingestellt ist.
Beispiele von geeigneten Metallkomplexen dieser Art schliessen z. B. die Aminkomplexe und die Tri- glykolamatchelate ein. Der Metallkomplex muss unter den bei der Elektrolyse herrschenden Bedingungen Me tallionen freigeben und sollte insbesondere solche Asso ziationskonstanten aufweisen, dass genügend Metallio nen gegenwärtig sind, um die Mitausfällung der redu zierten Metallionen zusammen mit dem Gold zu ermög lichen, wenn ein hellgelber bis blassgelber goldiger Gold legierungsüberzug gebildet werden soll.
Die Metallkom plexe können dem Bad als solche zugesetzt werden od. sie können in einem Bad, das bereits Metallsalze enthält, durch Zusatz eines komplexbildenden Mittels gebildet werden, bevor mit der Elektrolyse begonnen wird.
EMI0001.0030
<I>Beispiel <SEP> 1</I>
<tb> Gold <SEP> als <SEP> KAu <SEP> (CN)2 <SEP> 8 <SEP> g/1
<tb> Natriumzitrat <SEP> 50 <SEP> g/1
<tb> Zitronensäure <SEP> 12 <SEP> g/1
<tb> Nickel <SEP> als <SEP> Nickel-dimethyl äthanolamin <SEP> 450 <SEP> mg/1
<tb> pH <SEP> eingestellt <SEP> auf <SEP> 3,5
<tb> Temperatur <SEP> 35 C
<tb> Stromdichte <SEP> 0,01078 <SEP> A/cm2 Eine 9 x 2,54 cm Platte, die in diesem Bad über zogen wurde, war hell und der Niederschlag war ziem lich gelb.
EMI0001.0031
<I>Beispiel <SEP> 2</I>
<tb> Gold <SEP> als <SEP> KAu <SEP> (CN)2 <SEP> 8 <SEP> g/1
<tb> Natriumzitrat <SEP> 50 <SEP> g/1
<tb> Zitronensäure <SEP> 12 <SEP> g/1
<tb> Kobalt <SEP> als <SEP> Triglykolamat <SEP> 350 <SEP> mg/1
<tb> pH <SEP> eingestellt <SEP> auf <SEP> 3,5
<tb> Temperatur <SEP> 22 C
<tb> Stromdichte <SEP> 0,01078 <SEP> A/cm2 Eine 9 x 2,54 cm Platte, die in diesem Bad während einer Stunde überzogen wurde, war sehr hell.
(Additional patent to main patent 384 972) Process for the electrolytic application of a shiny coating made of gold or a gold alloy The subject of the main patent is a method for the electrolytic application of a shiny coating made of gold or a gold alloy, which is characterized by the fact that a solution is used as the electrolyte bath containing 10 to 150 g of a weak organic acid per liter,
Contains 1 to 15 g gold in the form of a cyanoaurate and up to 50 g / l of at least one other heavy metal in the form of a soluble metal salt and is adjusted to a pH of 3 to 5.
According to the process of the main patent, the metal salt supplies ions which are reduced under the electrolysis conditions and precipitated with the gold, with a shiny, bright gold coating or gold alloy coating being formed on the finished product.
It has now been found that very good results are obtained if this ionic form of the metal salt is added to the bath in the form of a soluble metal complex or a chelate.
The inventive method for the electrolytic application of a shiny coating of gold or a gold alloy is therefore characterized in that the electrolyte bath used is a solution containing 10 to 150 g of a weak organic acid, 1 to 15 g of gold in the form of a cyanoaurate per liter and up to 150 g of at least one further heavy metal in the form of a complex compound which releases metal ions under electrolysis conditions, contains and is adjusted to a pH of 3 to 5.
Examples of suitable metal complexes of this type include e.g. B. the amine complexes and the triglycol amate chelates. Under the conditions prevailing during electrolysis, the metal complex must release metal ions and, in particular, should have association constants such that sufficient metal ions are present to enable the reduced metal ions to co-precipitate together with the gold, if a light yellow to pale yellow gold alloy coating is to be formed.
The metal complexes can be added to the bath as such or. They can be formed in a bath that already contains metal salts by adding a complexing agent before the electrolysis is started.
EMI0001.0030
<I> Example <SEP> 1 </I>
<tb> Gold <SEP> as <SEP> KAu <SEP> (CN) 2 <SEP> 8 <SEP> g / 1
<tb> Sodium Citrate <SEP> 50 <SEP> g / 1
<tb> citric acid <SEP> 12 <SEP> g / 1
<tb> Nickel <SEP> as <SEP> Nickel-dimethylethanolamine <SEP> 450 <SEP> mg / 1
<tb> pH <SEP> set <SEP> to <SEP> 3.5
<tb> temperature <SEP> 35 C
<tb> Current density <SEP> 0.01078 <SEP> A / cm2 A 9 x 2.54 cm plate that was drawn over in this bath was light and the precipitate was quite yellow.
EMI0001.0031
<I> Example <SEP> 2 </I>
<tb> Gold <SEP> as <SEP> KAu <SEP> (CN) 2 <SEP> 8 <SEP> g / 1
<tb> Sodium Citrate <SEP> 50 <SEP> g / 1
<tb> citric acid <SEP> 12 <SEP> g / 1
<tb> Cobalt <SEP> as <SEP> triglycolamate <SEP> 350 <SEP> mg / 1
<tb> pH <SEP> set <SEP> to <SEP> 3.5
<tb> temperature <SEP> 22 C
<tb> Current density <SEP> 0.01078 <SEP> A / cm2 A 9 x 2.54 cm plate that was coated in this bath for one hour was very bright.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1207160A CH445246A (en) | 1957-08-13 | 1960-10-28 | Process for the electrolytic application of a shiny coating made of gold or a gold alloy |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US677818A US2905601A (en) | 1957-08-13 | 1957-08-13 | Electroplating bright gold |
| CH1207160A CH445246A (en) | 1957-08-13 | 1960-10-28 | Process for the electrolytic application of a shiny coating made of gold or a gold alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH445246A true CH445246A (en) | 1967-10-15 |
Family
ID=25709536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH1207160A CH445246A (en) | 1957-08-13 | 1960-10-28 | Process for the electrolytic application of a shiny coating made of gold or a gold alloy |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH445246A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4168214A (en) * | 1978-06-14 | 1979-09-18 | American Chemical And Refining Company, Inc. | Gold electroplating bath and method of making the same |
-
1960
- 1960-10-28 CH CH1207160A patent/CH445246A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4168214A (en) * | 1978-06-14 | 1979-09-18 | American Chemical And Refining Company, Inc. | Gold electroplating bath and method of making the same |
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