EP3921459A1 - Rose gold alloy, production method and use - Google Patents
Rose gold alloy, production method and useInfo
- Publication number
- EP3921459A1 EP3921459A1 EP20701217.0A EP20701217A EP3921459A1 EP 3921459 A1 EP3921459 A1 EP 3921459A1 EP 20701217 A EP20701217 A EP 20701217A EP 3921459 A1 EP3921459 A1 EP 3921459A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- comprised
- gold
- zinc
- alloy
- tellurium
- 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.)
- Pending
Links
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 25
- 239000000956 alloy Substances 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000010939 rose gold Substances 0.000 title abstract description 7
- 229910001112 rose gold Inorganic materials 0.000 title abstract description 7
- 239000010931 gold Substances 0.000 claims abstract description 26
- 239000010949 copper Substances 0.000 claims abstract description 24
- 239000011701 zinc Substances 0.000 claims abstract description 24
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052737 gold Inorganic materials 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 15
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 15
- 229910052714 tellurium Inorganic materials 0.000 claims abstract description 15
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 21
- 229910001020 Au alloy Inorganic materials 0.000 claims description 19
- 239000003353 gold alloy Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 238000009713 electroplating Methods 0.000 claims description 9
- 150000002739 metals Chemical class 0.000 claims description 9
- 229910052738 indium Inorganic materials 0.000 claims description 6
- 239000008139 complexing agent Substances 0.000 claims description 5
- 239000010985 leather Substances 0.000 claims description 5
- 238000007747 plating Methods 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000000080 wetting agent Substances 0.000 claims description 5
- 229910052733 gallium Inorganic materials 0.000 claims description 4
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 3
- OCUCCJIRFHNWBP-IYEMJOQQSA-L Copper gluconate Chemical class [Cu+2].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O OCUCCJIRFHNWBP-IYEMJOQQSA-L 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical class [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims description 2
- 150000001412 amines Chemical class 0.000 claims description 2
- 150000001413 amino acids Chemical class 0.000 claims description 2
- 229910052785 arsenic Inorganic materials 0.000 claims description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 2
- 150000001735 carboxylic acids Chemical class 0.000 claims description 2
- 150000001860 citric acid derivatives Chemical class 0.000 claims description 2
- DOBRDRYODQBAMW-UHFFFAOYSA-N copper(i) cyanide Chemical compound [Cu+].N#[C-] DOBRDRYODQBAMW-UHFFFAOYSA-N 0.000 claims description 2
- MOTZDAYCYVMXPC-UHFFFAOYSA-N dodecyl hydrogen sulfate Chemical compound CCCCCCCCCCCCOS(O)(=O)=O MOTZDAYCYVMXPC-UHFFFAOYSA-N 0.000 claims description 2
- 229940043264 dodecyl sulfate Drugs 0.000 claims description 2
- 229910052732 germanium Inorganic materials 0.000 claims description 2
- 229910052741 iridium Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 150000003891 oxalate salts Chemical class 0.000 claims description 2
- 235000021317 phosphate Nutrition 0.000 claims description 2
- 150000003009 phosphonic acids Chemical class 0.000 claims description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 2
- 229920000768 polyamine Polymers 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 2
- 229910052711 selenium Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 2
- 150000003892 tartrate salts Chemical class 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 150000003109 potassium Chemical class 0.000 claims 1
- 239000011230 binding agent Substances 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 229910002059 quaternary alloy Inorganic materials 0.000 abstract 1
- 238000005323 electroforming Methods 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 3
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052752 metalloid Inorganic materials 0.000 description 2
- 150000002738 metalloids Chemical class 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- -1 cadmium Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NNFCIKHAZHQZJG-UHFFFAOYSA-N potassium cyanide Chemical compound [K+].N#[C-] NNFCIKHAZHQZJG-UHFFFAOYSA-N 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000010076 replication Effects 0.000 description 1
- 229940005574 sodium gluconate Drugs 0.000 description 1
- 235000012207 sodium gluconate Nutrition 0.000 description 1
- 239000000176 sodium gluconate Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/02—Alloys based on gold
-
- 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
Definitions
- the present invention relates to a rose gold alloy, a method of galvanic electroplating that can be used to obtain it, and its use for decorative plating and the production of self-supporting shells in the clothing, jewelry, costume jewelry, footwear and leather goods sectors.
- the methods of galvanic electroplating make it possible to deposit one or more metals on an object that is capable of conducting electric current, thus forming one or more layers of various thickness.
- the end product that it is desired to obtain comprises both the object itself and the metallic layer, covering the former.
- the deposition is extended appropriately over time until a layer is obtained that, in addition to having a considerable thickness and being an exact replication of the object (matrix) on which it has been deposited, is detached from the latter at the end of the method.
- the layer therefore constitutes a form of self-supporting shell (with the matrix removed) and in such case, as is known, the method is referred to as "electroforming".
- the rose gold alloy is known, which is currently identified by UNI standard EN ISO 8654:2018 by the title“Jewelry - Colors of gold alloys - Definition, range of colors and designation” with the code 4N-6N.
- Such alloy which can be used for decorative plating and/or for electroforming in the clothing, jewelry, costume jewelry, footwear and leather goods sectors with a carat weight comprised between 9 and 22 carats, typically comprises cadmium and indium as binding agents, in addition to gold, copper and zinc.
- an alloy containing indium and cadmium has a certain degree of toxicity and the production of the alloy by way of galvanic electroplating leads to inconstant deposits, mainly owing to the fact that it is quite complicated to maintain the titer constant for the same current density applied.
- the aim of the present invention consists in providing a 4N-6N rose gold alloy by way of galvanic electroplating with optimal mechanical and weldability characteristics with a deposit thickness up to 50% reduced with respect to the thickness attainable with conventional alloys.
- an object of the present invention consists in providing a 4N-6N rose gold alloy with no toxic metals and/or metalloids.
- a gold alloy characterized in that it comprises gold, copper, zinc and tellurium with a percentage of tellurium expressed by weight on the total weight of the alloy comprised between 0.01 and 1%.
- a galvanic electroplating method for obtaining a gold alloy according to one or more of the preceding claims through the use of water-based galvanic baths, characterized in that it comprises the use of a galvanic bath comprising gold, copper, zinc and tellurium.
- a gold alloy that comprises gold, copper, zinc and tellurium, as a binding agent, with the following percentages expressed by weight on the total weight of the alloy:
- - Zn comprised between 0.01% and 1%.
- such gold alloy comprises gold, copper, zinc and tellurium with the following percentages expressed by weight on the total weight of the alloy:
- - Zn comprised between 0.01% and 0.2%.
- the gold alloy comprises gold, copper, zinc and tellurium with the following percentages expressed by weight on the total weight of the alloy:
- the gold alloy just described can be obtained with a method of galvanic electroplating by way of using water-based galvanic baths, in which these baths comprise gold, copper, zinc and tellurium with the following composition:
- - Cu comprised between 40 g/1 and 70 g/1 in the form of cuprous cyanide
- - Zn comprised between 100 mg/1 and 1 g/1 in the form of a zinc (II) complex
- the galvanic bath can be enriched with one or both of the substances selected from the group constituted by: free cyanide comprised between 10 g/1 and 50 g/1, complexing agents comprised between 5 g/1 and 20 g/1, conducting salts comprised between 10 g/1 and 100 g/1 and wetting agents comprised between 0.05 g/1 and 10 g/1.
- the complexing agents can be selected from the group constituted by: carboxylic acids, amino acids, polyamines, amines and phosphonic acids.
- conducting salts and the wetting agents can be selected respectively from the group constituted by: citrates, tartrates, oxalates, gluconates, carbonates, phosphates and sulfates and from the group constituted by: lauryl sulfate and quaternary ammonium salts.
- the galvanic bath can comprise grain refiners and/or brighteners selected from the group of metals constituted by: Zr, Ir, Se, Sb, Sn, Ga, In, Ge, Bi, T1 and Ag and/or additional metals in trace amounts owing to the use of technical products for its production, which are comprised in the group of metals constituted by: Ag, As, Se, In, Ge and Ga.
- the gold alloy and the method of galvanic electroplating respond to the technical problem set out above by making possible a deposit having characteristics of brilliance, mechanical strength (with hardness comprised between 300 and 400 HV) and weldability that are comparable to the known art with a deposit thickness up to 50% reduced with respect to the thicknesses attainable with conventional alloys.
- the alloy thus described and obtained can therefore be used for decorative plating and/or providing self-supporting shells in the clothing, jewelry, costume jewelry, footwear and leather goods sectors, obtaining thicknesses comprised between 1 and 1000 micrometers with carat weights from 9 to 22 carats.
- An advantage of the gold alloy according to the present invention consists in that it is free from toxic metals and/or metalloids, such as cadmium, which for conventional alloys are essential as a binding agent.
- the materials used, as well as the contingent shapes and dimensions may be any according to the requirements and to the state of the art.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
A quaternary alloy of rose gold containing gold, copper and zinc and, as a binder agent, tellurium with a percentage expressed by weight on the total weight of the alloy comprised between 0.01 and 1%, and the galvanic bath used for its production.
Description
ROSE GOLD ALLOY, PRODUCTION METHOD AND USE
The present invention relates to a rose gold alloy, a method of galvanic electroplating that can be used to obtain it, and its use for decorative plating and the production of self-supporting shells in the clothing, jewelry, costume jewelry, footwear and leather goods sectors.
As is known, the methods of galvanic electroplating make it possible to deposit one or more metals on an object that is capable of conducting electric current, thus forming one or more layers of various thickness.
In more detail, in some applications the end product that it is desired to obtain comprises both the object itself and the metallic layer, covering the former. Sometimes however, the deposition is extended appropriately over time until a layer is obtained that, in addition to having a considerable thickness and being an exact replication of the object (matrix) on which it has been deposited, is detached from the latter at the end of the method. The layer therefore constitutes a form of self-supporting shell (with the matrix removed) and in such case, as is known, the method is referred to as "electroforming". It is likewise well known that such baths have the peculiar characteristic of quickly and efficiently depositing a layer with a uniform thickness, both on the parts that protrude and in the recesses and in the hollows, thus ensuring metal coverings that are very bright but are not flattened out (which otherwise would render small details indistinguishable).
In the sector of gold alloys for galvanic electroplating, the rose gold alloy is known, which is currently identified by UNI standard EN ISO 8654:2018 by the title“Jewelry - Colors of gold alloys - Definition, range of colors and designation” with the code 4N-6N.
Such alloy, which can be used for decorative plating and/or for electroforming in the clothing, jewelry, costume jewelry, footwear and leather goods sectors with a carat weight comprised between 9 and 22 carats, typically comprises cadmium and indium as binding agents, in
addition to gold, copper and zinc.
The principal drawback of such an alloy consists in that it loses its characteristics of brilliance, harmony, and weldability owing to the fact that the deposit is not perfectly uniform when the plating goes down to thicknesses of less than 100 micrometers.
In addition, even for greater thicknesses than those cited above, an alloy containing indium and cadmium has a certain degree of toxicity and the production of the alloy by way of galvanic electroplating leads to inconstant deposits, mainly owing to the fact that it is quite complicated to maintain the titer constant for the same current density applied.
In order to overcome the foregoing it is necessary to have deposits of high thicknesses, with an inevitable increase in the cost of the alloy which is directly linked to the amount of gold contained in it.
The aim of the present invention consists in providing a 4N-6N rose gold alloy by way of galvanic electroplating with optimal mechanical and weldability characteristics with a deposit thickness up to 50% reduced with respect to the thickness attainable with conventional alloys.
Within this aim, an object of the present invention consists in providing a 4N-6N rose gold alloy with no toxic metals and/or metalloids.
This aim and this and other objects which will become better evident hereinafter are achieved by a gold alloy, characterized in that it comprises gold, copper, zinc and tellurium with a percentage of tellurium expressed by weight on the total weight of the alloy comprised between 0.01 and 1%.
Furthermore, this aim and this and other objects which will become better evident hereinafter are achieved by a galvanic electroplating method for obtaining a gold alloy according to one or more of the preceding claims through the use of water-based galvanic baths, characterized in that it comprises the use of a galvanic bath comprising gold, copper, zinc and tellurium.
Further characteristics and advantages of the invention will become
better apparent from the detailed description of a preferred, but not exclusive, embodiment of a gold alloy, according to the invention, that comprises gold, copper, zinc and tellurium, as a binding agent, with the following percentages expressed by weight on the total weight of the alloy:
- Au comprised between 30 and 95%
- Te comprised between 0.01 and 1%
- Cu comprised between 3% and 69.98%
- Zn comprised between 0.01% and 1%.
More specifically, such gold alloy comprises gold, copper, zinc and tellurium with the following percentages expressed by weight on the total weight of the alloy:
- Au comprised between 37% and 92%
- Te comprised between 0.02% and 0.2%
- Cu comprised between 7.6% and 62.97%
- Zn comprised between 0.01% and 0.2%.
In a specific embodiment, the gold alloy comprises gold, copper, zinc and tellurium with the following percentages expressed by weight on the total weight of the alloy:
- Au equal to 75%
- Te equal to 0.1%
- Cu equal to 24.88%
- Zn equal to 0.02%.
The gold alloy just described can be obtained with a method of galvanic electroplating by way of using water-based galvanic baths, in which these baths comprise gold, copper, zinc and tellurium with the following composition:
- Au comprised between 3 g/1 and 8 g/1 in the form of potassium dicyanoaurate complex,
- Cu comprised between 40 g/1 and 70 g/1 in the form of cuprous cyanide,
- Zn comprised between 100 mg/1 and 1 g/1 in the form of a zinc (II) complex,
- Te comprised between 1 mg/1 and 100 mg/1 in the form of an alkaline complex,
and in which the operating parameters are:
- temperature comprised between 50 °C and 80°C,
- pH comprised between 8 and 12, and
- applied current density comprised between 0.2 A/dm2 and 1.5 A/dm2.
Conveniently, the galvanic bath can be enriched with one or both of the substances selected from the group constituted by: free cyanide comprised between 10 g/1 and 50 g/1, complexing agents comprised between 5 g/1 and 20 g/1, conducting salts comprised between 10 g/1 and 100 g/1 and wetting agents comprised between 0.05 g/1 and 10 g/1.
More specifically, the complexing agents can be selected from the group constituted by: carboxylic acids, amino acids, polyamines, amines and phosphonic acids.
Considering the cited conducting salts and the wetting agents, these can be selected respectively from the group constituted by: citrates, tartrates, oxalates, gluconates, carbonates, phosphates and sulfates and from the group constituted by: lauryl sulfate and quaternary ammonium salts.
To complete the galvanic bath, it can comprise grain refiners and/or brighteners selected from the group of metals constituted by: Zr, Ir, Se, Sb, Sn, Ga, In, Ge, Bi, T1 and Ag and/or additional metals in trace amounts owing to the use of technical products for its production, which are comprised in the group of metals constituted by: Ag, As, Se, In, Ge and Ga.
Below is an example of a possible galvanic solution, and also the operating parameters of the galvanic bath:
- Au: 5 g/1
- Cu: 55 g/1
- Zn: 0.5 g/1
- Te: 50 mg/1
- pH: 10.5
- temperature: comprised between 60 and 70 °C
- current density: 0.5 A/dm2
- triethylenetetramine: 1 ml/1
- iminodiacetic acid: 10 g/1
- sodium gluconate: 5 g/1
- free potassium cyanide: 25 g/1
In practice it has been found that the gold alloy and the method of galvanic electroplating, according to the invention, respond to the technical problem set out above by making possible a deposit having characteristics of brilliance, mechanical strength (with hardness comprised between 300 and 400 HV) and weldability that are comparable to the known art with a deposit thickness up to 50% reduced with respect to the thicknesses attainable with conventional alloys.
In other words, the possibility of obtaining gold alloys with very low thicknesses with unchanged mechanical characteristics enables a considerable cost saving both for the amount of gold used and for the subsequent processing stages, with reference to a work cycle based on electroforming.
With respect to other alloys obtained with the electroforming processes known today, excellent results are obtained in the welding and/or in the production of self-supporting shells even with thicknesses far below 100 microns, a lower limit value that to date could not be surpassed with the processes of the known art in order to obtain objects that have optimal characteristics of mechanical strength and harmony.
The alloy thus described and obtained can therefore be used for decorative plating and/or providing self-supporting shells in the clothing, jewelry, costume jewelry, footwear and leather goods sectors, obtaining thicknesses comprised between 1 and 1000 micrometers with carat weights
from 9 to 22 carats.
An advantage of the gold alloy according to the present invention consists in that it is free from toxic metals and/or metalloids, such as cadmium, which for conventional alloys are essential as a binding agent.
The gold alloy, the method, and also the use, thus conceived, are susceptible of numerous modifications and variations, all of which are within the scope of the appended claims.
Moreover, all the details may be substituted by other, technically equivalent elements.
In practice, the materials used, as well as the contingent shapes and dimensions, may be any according to the requirements and to the state of the art.
The disclosures in Italian Patent Application No. 102019000001769 from which this application claims priority are incorporated herein by reference.
Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs
Claims
1. A gold alloy, characterized in that it comprises gold, copper, zinc and tellurium with a percentage of tellurium expressed by weight on the total weight of the alloy comprised between 0.01 and 1%.
2. The gold alloy according to claim 1, characterized in that it comprises gold, copper and zinc with the following percentages expressed by weight on the total weight of the alloy:
- Au comprised between 30 and 95%
- Cu comprised between 3% and 69.98%
- Zn comprised between 0.01% and 1%.
3. The gold alloy according to claim 2, characterized in that it comprises gold, copper, zinc and tellurium with the following percentages expressed by weight on the total weight of the alloy:
- Au comprised between 37% and 92%
- Te comprised between 0.02% and 0.2%
- Cu comprised between 7.6% and 62.97%
- Zn comprised between 0.01% and 0.2%.
4. The gold alloy according to claim 3, characterized in that it comprises gold, copper, zinc and tellurium with the following percentages expressed by weight on the total weight of the alloy:
- Au equal to 75%
- Te equal to 0.1%
- Cu equal to 24.88%
- Zn equal to 0.02%.
5. A galvanic electroplating method for obtaining a gold alloy according to one or more of the preceding claims through the use of water- based galvanic baths, characterized in that it comprises the use of a galvanic bath comprising gold, copper, zinc and tellurium.
6. The method according to claim 5, characterized in that said galvanic bath comprises gold in the form of a potassium dicyanoaurate
complex, copper in the form of cuprous cyanide, zinc in the form of a zinc (II) complex and tellurium in the form of an alkaline complex.
7. The method according to claim 5 or 6, characterized in that said galvanic bath comprises gold, copper, zinc and tellurium with the following composition:
- Au comprised between 3 g/1 and 8 g/1
- Cu comprised between 40 g/1 and 70 g/1
- Zn comprised between 100 mg/1 and 1 g/1
- Te comprised between 1 mg/1 and 100 mg/1.
8. The method according to one or more of claims 5 to 7, characterized in that said galvanic bath comprises at least one from the substances selected from the group constituted by: free cyanide, complexing agents, conducting salts and wetting agents.
9. The method according to claim 8, characterized in that said complexing agents are selected from the group constituted by: carboxylic acids, amino acids, polyamines, amines and phosphonic acids.
10. The method according to claim 8 or 9, characterized in that said conducting salts are selected from the group constituted by: citrates, tartrates, oxalates, gluconates, carbonates, phosphates and sulfates.
11. The method according to one or more of claims 8 to 10, characterized in that said wetting agents are selected from the group constituted by: lauryl sulfate and quaternary ammonium salts.
12. The method according to one or more of claims 8 to 11, characterized in that said galvanic bath comprises:
- free cyanide comprised between 10 g/1 and 50 g/1
- complexing agents comprised between 5 g/1 and 20 g/1
- conducting salts comprised between 10 g/1 and 100 g/1
- wetting agents comprised between 0.05 g/1 and 10 g/1.
13. The method according to one or more of claims 8 to 12, characterized in that said galvanic bath comprises grain refiners and/or
brighteners.
14. The method according to claim 13, characterized in that said grain refiners and/or brighteners are selected from the group of metals constituted by Zr, Ir, Se, Sb, Sn, Ga, In, Ge, Bi, T1 and Ag.
15. The method according to one or more of claims 8 to 14, characterized in that said galvanic bath comprises additional metals in trace amounts owing to the use of technical products for its production, which are comprised in the group of metals constituted by: Ag, As, Se, In, Ge and Ga.
16. Use of the gold alloy according to one or more of claims 1 to 4 for decorative plating in the clothing, jewelry, costume jewelry, footwear and leather goods sectors.
17. Use of the gold alloy according to one or more of claims 1 to 4 for providing self-supporting shells in the clothing, jewelry, costume jewelry, footwear and leather goods sectors.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102019000001769A IT201900001769A1 (en) | 2019-02-07 | 2019-02-07 | Rose gold alloy, manufacturing process and use. |
| PCT/EP2020/051892 WO2020160951A1 (en) | 2019-02-07 | 2020-01-27 | Rose gold alloy, production method and use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3921459A1 true EP3921459A1 (en) | 2021-12-15 |
Family
ID=66380037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20701217.0A Pending EP3921459A1 (en) | 2019-02-07 | 2020-01-27 | Rose gold alloy, production method and use |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3921459A1 (en) |
| CN (1) | CN113260738A (en) |
| BR (1) | BR112021011187A2 (en) |
| IT (1) | IT201900001769A1 (en) |
| WO (1) | WO2020160951A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE754151A (en) * | 1969-08-08 | 1970-12-31 | Sel Rex Corp | AQUEOUS BATH FOR ELECTROLYTIC GOLD OR GOLD ALLOY PLATING ON A CONDUCTIVE ARTICLE, PROCESS FOR MANUFACTURING SUCH AQUEOUS BATH AND USE OF THE SAME |
| CH662583A5 (en) * | 1985-03-01 | 1987-10-15 | Heinz Emmenegger | GALVANIC BATH FOR THE ELECTROLYTIC DEPOSITION OF GOLD-COPPER-CADMIUM-ZINC ALLOYS. |
| DE3878783T2 (en) * | 1987-08-21 | 1993-07-22 | Engelhard Ltd | BATH FOR ELECTROPLATING A GOLD-COPPER-ZINC ALLOY. |
| GB8903818D0 (en) * | 1989-02-20 | 1989-04-05 | Engelhard Corp | Electrolytic deposition of gold-containing alloys |
| TWI404233B (en) * | 2009-03-31 | 2013-08-01 | Epistar Corp | A photoelectronic element and the manufacturing method thereof |
| DE102011056318B3 (en) * | 2011-12-13 | 2013-04-18 | Doduco Gmbh | Electrolytic bath for depositing a gold-copper alloy |
| CH707539B1 (en) * | 2013-02-06 | 2017-01-13 | Rolex Sa | Pink gold alloy for timepiece. |
-
2019
- 2019-02-07 IT IT102019000001769A patent/IT201900001769A1/en unknown
-
2020
- 2020-01-27 WO PCT/EP2020/051892 patent/WO2020160951A1/en unknown
- 2020-01-27 CN CN202080006351.7A patent/CN113260738A/en active Pending
- 2020-01-27 BR BR112021011187-5A patent/BR112021011187A2/en unknown
- 2020-01-27 EP EP20701217.0A patent/EP3921459A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| IT201900001769A1 (en) | 2020-08-07 |
| CN113260738A (en) | 2021-08-13 |
| WO2020160951A1 (en) | 2020-08-13 |
| BR112021011187A2 (en) | 2021-08-24 |
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