EP1198623B1 - Verfahren zur herstellung einer cyanidfreien, für galvanische gold-bäder geeigneten goldverbindungslösung - Google Patents
Verfahren zur herstellung einer cyanidfreien, für galvanische gold-bäder geeigneten goldverbindungslösung Download PDFInfo
- Publication number
- EP1198623B1 EP1198623B1 EP00929531A EP00929531A EP1198623B1 EP 1198623 B1 EP1198623 B1 EP 1198623B1 EP 00929531 A EP00929531 A EP 00929531A EP 00929531 A EP00929531 A EP 00929531A EP 1198623 B1 EP1198623 B1 EP 1198623B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gold
- solution
- cysteinate
- cyanide
- aqueous medium
- 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
- C25D3/48—Electroplating: Baths therefor from solutions of gold
Definitions
- the invention relates to a method for producing a cyanide-free, for galvanic gold baths suitable gold joining solution, a corresponding gold joining solution and their uses.
- gold connection solutions for galvanic are from the prior art Baths which have the disadvantage of decomposing after a certain time;
- An ammonium disulfitoaurate solution is a typical example.
- the problem that arises is in particular therein, a process for producing a cyanide-free, stable and for galvanic Gold baths to provide suitable gold bonding solution.
- a cysteine and / or cysteinate with a tetrachloro-gold acid and / or a tetrachloro-gold salt in a first aqueous Medium especially in water, implemented.
- Potassium or, for example, can be used as the cysteinate
- Sodium cysteinate can be used, while as the tetrachloro gold salt e.g. Sodium or Potassium tetrachloroaurate can be used.
- the precipitate obtained from the first aqueous Medium separated can be done, for example, by centrifuging and decanting several times of the supernatant liquid.
- the precipitate obtained is in a second aqueous medium, for example in water, by adding, for example, a potassium hydroxide solution with a simultaneous increase the pH to 12.0 to 14.0.
- the gold joining solutions obtained in this way are excluded from Light and air stable for several weeks and have excellent properties for galvanic Gold baths on.
- the separated precipitate is washed free of chloride.
- the molar ratio of cysteine / cysteinate to the tetrachlorogold compound is 3: 1 to 10: 1.
- the molar ratio of 3: 1 gives the highest yields.
- the reaction is advantageously carried out at a temperature of T ⁇ + 30 ° C because decomposition phenomena of the gold compound can be observed at higher temperatures.
- the gold connection solutions prepared by the above method have the corresponding ones Properties on.
- HAuCl 4 solution 43.021 g (0.0906 mol) of HAuCl 4 solution are weighed into a second beaker (400 ml) and made up to a volume of 145 ml.
- a rust-red clear solution is created.
- the gold chloride solution is added in portions to the amino acid salt solution.
- the solution Since the reaction is exothermic, the solution must be cooled during the entire addition, so that the temperature is not more than + 20 ° C.
- This suspension is then allowed to stir for a further 11 ⁇ 2 hours. It has become a little lighter but still has a yellow tinge. The suspension is then centrifuged washed free of chloride.
- aqueous KOH solution (50%) is added, up to one pH of 13.5. A golden yellow solution was obtained. Because of the still small Turbidity of the solution was filtered through a cellulose filter.
- the Au content of the solution is 3.16% (Au yield: 97.7%).
- the Cl content of the solution is 17 ppm. The solution is stable for months.
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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Der Cl-Gehalt der Lösung liegt bei 17 ppm.
Die Lösung ist über Monate stabil.
Claims (6)
- Verfahren zur Herstellung einer cyanidfreien, für galvanische Gold-Bäder geeigneten Goldverbindungslösung, mit:a) Umsetzung eines Cysteins und/oder Cysteinats mit einer Tetrachlorogoldsäure und/oder einem Tetrachlorogoldsalz in einem ersten wäßrigen Medium.b) Abtrennen des erhaltenen Niederschlags vom ersten wäßrigen Medium undc) Lösen des Niederschlags in einem zweiten wäßrigen Medium bei Erhöhung des pH-Wertes auf 12,0 bis 14,0.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der abgetrennte Niederschlag chloridfrei gewaschen wird.
- Verfahren nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß das Mol-Verhältnis von Cystein/Cysteinat zur Tetrachlorogold-Verbindung 3:1 bis 10:1 beträgt.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Umsetzung bei einer Temperatur T < +30°C durchgeführt wird.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß beim Lösen des Niederschlags der pH-Wert auf 13,5 erhöht wird.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß als Cysteinat L-Kaliumcysteinat verwendet wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924895A DE19924895B4 (de) | 1999-06-01 | 1999-06-01 | Verfahren zur Herstellung einer cyanidfreien, für galvanische Gold-Bäder geeigneten Goldverbindungslösung |
DE19924895 | 1999-06-01 | ||
PCT/EP2000/004368 WO2000073540A1 (de) | 1999-06-01 | 2000-05-16 | Verfahren zur herstellung einer cyanidfreien, für galvanische gold-bäder geeigneten goldverbindungslösung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1198623A1 EP1198623A1 (de) | 2002-04-24 |
EP1198623B1 true EP1198623B1 (de) | 2003-03-19 |
Family
ID=7909762
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00929531A Expired - Lifetime EP1198623B1 (de) | 1999-06-01 | 2000-05-16 | Verfahren zur herstellung einer cyanidfreien, für galvanische gold-bäder geeigneten goldverbindungslösung |
Country Status (7)
Country | Link |
---|---|
US (1) | US6733651B1 (de) |
EP (1) | EP1198623B1 (de) |
JP (1) | JP2003500550A (de) |
AT (1) | ATE234949T1 (de) |
DE (2) | DE19924895B4 (de) |
ES (1) | ES2193959T3 (de) |
WO (1) | WO2000073540A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101724872B (zh) * | 2008-10-20 | 2013-05-08 | 长沙铂鲨环保设备有限公司 | 一种无氰镀金盐溶液 |
EP2438217A4 (de) * | 2009-06-01 | 2013-11-27 | Univ Rmit | Elektrisch abgelagerte goldnanostrukturen |
DE102009024396A1 (de) * | 2009-06-09 | 2010-12-16 | Coventya Spa | Cyanid-freier Elektrolyt zur galvanischen Abscheidung von Gold oder dessen Legierungen |
WO2014106830A1 (en) * | 2013-01-07 | 2014-07-10 | Ramot At Tel-Aviv University Ltd. | Jellyfish-derived polymer |
DE102013015805A1 (de) | 2013-09-24 | 2015-03-26 | Heraeus Precious Metals Gmbh & Co. Kg | Verfahren zur Herstellung eines glänzenden Schichtaufbaus |
EP2980051B1 (de) | 2014-08-01 | 2019-03-13 | Heraeus Deutschland GmbH & Co. KG | Erzeugung einer Dekorschicht auf keramischen Oberflächen |
EP4245893A1 (de) | 2022-03-15 | 2023-09-20 | Université de Franche-Comté | Goldgalvanisierungslösung und ihre verwendung zur galvanischen abscheidung von gold mit gealtertem aussehen |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH622829A5 (de) * | 1977-08-29 | 1981-04-30 | Systemes Traitements Surfaces | |
US5338343A (en) | 1993-07-23 | 1994-08-16 | Technic Incorporated | Catalytic electroless gold plating baths |
JP3566498B2 (ja) | 1997-05-14 | 2004-09-15 | 株式会社大和化成研究所 | 置換金めっき浴 |
JP3671102B2 (ja) | 1997-05-16 | 2005-07-13 | 株式会社大和化成研究所 | 非シアンの電気金めっき浴 |
-
1999
- 1999-06-01 DE DE19924895A patent/DE19924895B4/de not_active Expired - Fee Related
-
2000
- 2000-05-16 EP EP00929531A patent/EP1198623B1/de not_active Expired - Lifetime
- 2000-05-16 WO PCT/EP2000/004368 patent/WO2000073540A1/de active IP Right Grant
- 2000-05-16 DE DE50001514T patent/DE50001514D1/de not_active Expired - Lifetime
- 2000-05-16 AT AT00929531T patent/ATE234949T1/de not_active IP Right Cessation
- 2000-05-16 ES ES00929531T patent/ES2193959T3/es not_active Expired - Lifetime
- 2000-05-16 US US09/980,968 patent/US6733651B1/en not_active Expired - Fee Related
- 2000-05-16 JP JP2001500023A patent/JP2003500550A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
JP2003500550A (ja) | 2003-01-07 |
ES2193959T3 (es) | 2003-11-16 |
EP1198623A1 (de) | 2002-04-24 |
WO2000073540A1 (de) | 2000-12-07 |
DE19924895B4 (de) | 2004-03-25 |
WO2000073540A8 (de) | 2001-09-13 |
ATE234949T1 (de) | 2003-04-15 |
DE50001514D1 (de) | 2003-04-24 |
US6733651B1 (en) | 2004-05-11 |
DE19924895A1 (de) | 2001-05-10 |
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