CN111826686A - Method for preparing hard gold gyroscope flywheel bracket - Google Patents
Method for preparing hard gold gyroscope flywheel bracket Download PDFInfo
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- CN111826686A CN111826686A CN202010687376.XA CN202010687376A CN111826686A CN 111826686 A CN111826686 A CN 111826686A CN 202010687376 A CN202010687376 A CN 202010687376A CN 111826686 A CN111826686 A CN 111826686A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
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- 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
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
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Abstract
The invention discloses a method for preparing a hard gold gyroscope flywheel bracket, which comprises the following steps: machining a material with a conductive layer on the surface to prepare a tourbillon bracket blank; taking the tourbillon bracket as a substrate, and depositing and forming a hard gold layer with the thickness of 0.02-5mm, the color formation of 99% or more and the Vickers hardness of HV40-HV180 on the conductive layer of the substrate through an electroplating/electroforming process; and (3) machining the electroplated/electroformed tourbillon bracket semi-finished product by adopting a mechanical or manual mode according to the precision requirement of the tourbillon bracket. The invention aims to solve the problem that a tourbillon bracket cannot be made of gold in the prior art, improve the artistry, the decoration and the collection of the clock, ensure that the tourbillon bracket has better physical and chemical properties and improve the stability and the accuracy of the running of the tourbillon.
Description
Technical Field
The invention relates to the field of clock part processing, in particular to a method for preparing a hard gold gyroscope flywheel bracket.
Background
Timepieces have been invented and used for centuries as a time-keeping tool. Before the digital era, timepieces are the most important way to acquire time information in people's daily life. However, with the explosion of the information digital age, people are increasingly acquiring time information from various digital terminals. The clock gradually develops towards the direction of mounting and collecting articles, and the demand of people for the clock decoration and collection function is greatly improved. The gold material is a metal material popular with people since ancient times, and along with the increasing living standard of people, the gold product is more and more popular with consumers, and particularly the gold material is preferably applied to the modern field of jewelry clocks and watches. Because of the softer reason of gold material texture, mainly use the gold in the surface decoration parts that intensity requirements are not high such as watchcase, batch wreath, face, table needle, watchband on the market at present, receive the restriction of gold material moreover, use these surface of gold preparation to install parts or the look is not high, or just plate a layer gold as the decoration on other metal surfaces. In the internal parts of the timepiece, such as the tourbillon stand, which is an important part of the timepiece, the tourbillon stand made of gold has not appeared on the market because the gold material is soft and hard to reach the supporting strength required by the tourbillon stand of the timepiece.
Obviously, if the tourbillon bracket can be made of gold with enough strength, the artistry, the decoration and the collection of the clock can be greatly improved, and the market value is greatly improved. Compared with the common clock materials, the gold has high ornamental value, good ductility and malleability, smaller temperature coefficient and more excellent physical and chemical properties.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the object of the present invention is to: the problem of can't use gold preparation tourbillon support among the prior art is solved, promote the artistry, decorative and the collection nature of clock and watch, when making tourbillon support possess better physics and chemical properties, promote tourbillon moving stability and accuracy.
This patent scheme provides a method for preparing hard gold top flywheel support, includes:
(1) the tourbillon bracket blank is manufactured by adopting a metal material or wax with common hardness, gold or non-gold, through one or more production processes of die casting, extrusion, oil pressure and reverse die;
(2) carrying out surface treatment on the tourbillon bracket blank;
(3) taking the tourbillon bracket blank as a substrate, and depositing and forming a hard gold layer with the thickness of 0.02-5mm, the color forming rate of 99% or more and the Vickers hardness of HV40-HV180 on the surface of the substrate through an electroplating/electroforming process;
(4) after a tourbillon bracket blank made of non-gold metal material or wax is electroplated/electroformed, the tourbillon bracket blank is removed by a physical or chemical method, only a hard gold layer is reserved, and the color of the hard gold layer is 99% or more;
(5) according to the precision requirement of the tourbillon bracket, the electroplated/electroformed tourbillon bracket semi-finished product is processed mechanically or manually
Further, in the step (1), the non-gold metal material includes copper/iron/aluminum/zinc/tin/bismuth or an alloy of these metals.
Further, the step (2) is specifically: carrying out die holding polishing treatment on the surface of the tourbillon bracket blank made of metal material with common hardness of gold or non-gold; and coating a conductive layer on the surface of the tourbillon bracket blank made of wax.
Further, the die-cut polishing process comprises: polishing the surface of the tourbillon bracket blank by one or more methods of a laser polishing method, a chemical polishing method, an electrolytic polishing method, a fluid polishing method and a magnetic grinding polishing method.
Further, the surface of the blank part of the tourbillon bracket made of non-gold metal material is shielded by a shielding method, and the shielding material is non-conductive material.
The improvement of this patent brings the following advantage:
(1) the gold is used for manufacturing the clock tourbillon bracket, so that the artistry and the collection value of the clock are greatly improved, the gold has high ornamental value, the decorative effect of the clock can be improved without complex processing and carving, and particularly the gold is used for the clock which is popular at present and can see through internal parts;
(2) the hard gold tourbillon bracket manufactured by adopting the electroforming/electroplating process is far higher than the hardness of common gold, the highest hardness can reach about Vickers hardness HV180, the requirement of the clock tourbillon bracket on the hardness can be completely met, and the hardness is even higher than that of the current common clock materials;
(3) the hard gold tourbillon bracket has light weight, is wear-resistant, has the appearance surface reaching the required smooth finish, has good flexibility, ensures the stable and ordered operation of the tourbillon, has high processing precision, and effectively improves the timing precision of the clock; on the other hand, the hard gold tourbillon bracket is made of nonmagnetic material, compared with the clock tourbillon bracket which is usually made of magnetic material at present, the interference on the clock running is undoubtedly reduced, and although the interference is weak, the interference accumulated for a long time can also have adverse effect on the timing precision;
(4) the gold has excellent chemical properties, is antioxidant and corrosion resistant, and the tourbillon bracket is made of gold material, so that the service life and the collection life of the clock are prolonged, and the collection value is increased.
Drawings
Fig. 1 is a schematic structural view of a tourbillon support according to embodiment 1 of the present invention;
fig. 2 is a schematic view of an upper hemisphere support structure described in embodiment 1 of the present invention;
FIG. 3 is a schematic view of the lower hemisphere support structure described in example 1 of the present invention;
in the figure, 1 is an upper hemisphere bracket, and 2 is a lower hemisphere bracket.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1
Firstly, a spherical tourbillon bracket blank is made of common hard gold through oil pressure or reverse mould or other modes; optionally, (1) drawing a 3D diagram of a steel mould used for the tourbillon support blank; (2) manufacturing an oil pressure steel die according to the drawn 3D diagram; (3) filling the gold raw material into the steel die obtained in the step (2), and performing oil pressure on the gold raw material in an oil press to obtain a gold tourbillon bracket blank; preferably, as shown in fig. 1, the spherical tourbillon stand comprises an upper hemispherical stand 1 and a lower hemispherical stand 2 which are matched; the upper hemispherical support 1 comprises a first tightening ring, a second tightening ring, five upper supporting strips, a reinforcing rib and a first connecting plate, wherein the upper supporting strips and the reinforcing rib are uniformly and circumferentially connected to the periphery of the first connecting plate, the upper supporting strips are circumferentially arranged along the first tightening ring and are bent inwards, the second tightening ring is clamped in the middle of the upper supporting strips, and the other end of the reinforcing rib is connected with the second tightening ring; the lower hemispherical support 2 comprises a third tightening ring, a fourth tightening ring, six lower support strips and a second connecting plate, the lower support strips are uniformly and circumferentially distributed along the third tightening ring and are bent inwards, the second connecting plate is connected with the top end of the lower support strip, and the fourth tightening ring is clamped in the middle of the lower support strip; the first tightening ring and the third tightening ring are provided with four matched through holes; the first connecting plate and the second connecting plate are respectively provided with a matched through hole, the second hooping ring is provided with three screw holes which are mutually adjacent and arranged at the joint of the reinforcing rib and the second hooping ring; optionally, polishing the surface of the tourbillon bracket blank by one or more methods of laser polishing, chemical polishing, electrolytic polishing, fluid polishing and magnetic grinding polishing;
among them, the chemical polishing process has the greatest advantage of high productivity in that it can polish parts having complicated shapes without requiring a direct current power supply and a special jig, as compared with the electrochemical polishing process. In terms of functionality, chemical polishing can remove a mechanical damage layer and a stress layer on the surface to obtain a surface with mechanical cleanliness besides the surface with physical and chemical cleanliness, which is beneficial to preventing local corrosion of parts, improving mechanical strength and prolonging the service life of the parts;
electropolishing is a special anodic process, in which two contradictory processes, namely the continuous formation and dissolution of an oxide film on the metal surface, are performed simultaneously on the surface during the entire anodic electropolishing process. However, the conditions for chemical film formation at the convex parts and the concave parts on the surface of the stainless steel product to enter the passive state are different, and the concentration of metal salt in the anode region is continuously increased due to anode dissolution, so that a high-resistivity thick sticky film layer is formed on the surface of the stainless steel product. The thickness of the thick mucosa at the microscopic concave-convex part on the surface of the product is different, and the current on the microscopic surface of the anode is unevenly distributed. The current density at the microscopic bulges is high, the dissolution is fast, and burrs on the surface of the product or the microscopic bulges are preferentially dissolved to achieve leveling; the current density in the depressions is lower and the dissolution is slower. Because of the different current density distribution, the surface of the product is continuously filmed and dissolved at different rates. Two opposite processes are simultaneously carried out on the surface of the anode, film forming and dissolution are carried out, and a passivation film is continuously generated and dissolved, so that the surface is leveled, the appearance with high smoothness and luster is achieved, and the purpose of surface polishing and finishing is met;
the fluid polishing is realized by flushing the surface of a workpiece by high-speed flowing liquid and abrasive particles carried by the liquid. The common methods are as follows: abrasive jet machining, liquid jet machining, hydrodynamic grinding, and the like. Hydrodynamic grinding is hydraulically driven, with a high velocity reciprocating flow of a liquid medium carrying abrasive particles across the workpiece surface. The medium is mainly made of special compound with good flowing property under lower pressure and mixed with abrasive, and the abrasive can be silicon carbide powder;
the magnetic grinding and polishing is to grind and process a workpiece by using a magnetic grinding material to form a grinding material brush under the action of a magnetic field. The method has the advantages of high processing efficiency, good quality, easy control of processing conditions and good working conditions. The surface roughness can reach Ra0.1 mu m by adopting a proper abrasive material;
laser polishing is a process that uses the interaction of a laser with the surface of a material, which follows the general laws of laser interaction with materials. The action mode between the laser and the material has thermal action and photochemical action, and laser polishing can be divided into hot polishing and cold polishing. Thermal polishing is the removal of material by melting, evaporation, etc. using the thermal effect of a laser. Therefore, the material can be used for polishing as long as the material has good thermophysical properties, but the thermal stress generated by the large temperature gradient is large, so that cracks are easily generated, and the effect of thermal polishing is not good. Cold polishing is to remove material by breaking the chemical bonds or breaking the lattice structure of the material with a photochemical surface layer after the material absorbs photons. During the chemical action, the heat effect can be ignored, so the heat stress is small, no crack is generated, the surrounding material is not influenced, the removal amount of the material is easy to control, and the method is particularly suitable for the precise processing of the hard and brittle material;
secondly, electroforming or electroplating the common blank of the flywheel bracket of the gold gyroscope, and plating hard gold with the thickness of 0.02-5mm on one side, wherein the color of the hard gold is 99% or more, and the hardness is between HV40-HV 180; optionally, electroplating is carried out by using cyanide-free sulfite gold plating solution as electroplating solution; optionally, the cyanide-free sulfite gold plating solution comprises: gold sulfite, alkali metal sulfite, 3-nitrobenzenesulfonate, organic polyamine, organic phosphonate, polyol compound, imine-containing high-molecular polymer and thiourea derivative; preferably, the content of gold sulfite calculated by gold element is 8-15g/L, the content of alkali metal sulfite is 30-150g/L, the content of 3-nitrobenzenesulfonate is 1.5-12g/L, the content of organic polyamine is 20-45g/L, the content of organic phosphonate is 10-30/L, the content of polyol compound is 0.03-0.2/L, the content of high molecular polymer containing imine is 200-600mg/L and the content of thiourea derivative is 150-450 mg/L; in order to improve the hardness of the gold plating layer, a hardening agent can be optionally added to the cyanide-free sulfite gold plating solution, and the hardening agent comprises: phosphate, hydrogen phosphate, sulfite, antimony salt and/or selenium salt and a complexing agent, wherein the sulfite is alkali sulfite; preferably, in the hardener, the content of the hydrogen phosphate is 50 to 200 g, the content of the alkali metal sulfite is 30 to 120g, the total content of the antimony salt and the selenium salt is 0.01 to 2g, and the content of the complexing agent is 0.01 to 5g, relative to 100-200 g of the phosphate.
Thirdly, performing finish machining on the semi-finished tourbillon bracket by oil pressure or numerical control machine tool machining or other methods to produce a tourbillon bracket meeting the standard;
and (IV) grinding, polishing/calendering and cleaning the electroformed/electroplated hard gold tourbillon bracket.
Example 2
Firstly, adopting metals such as copper/iron/aluminum/zinc/tin/bismuth and the like or alloys of the metals to manufacture a tourbillon bracket blank; (1) drawing a 3D (three-dimensional) diagram of a steel mould used for the tourbillon support blank; (2) manufacturing a steel mould according to the drawn 3D picture; (3) filling the metal or alloy raw material into the steel die obtained in the step (2), and die-casting the metal or alloy raw material in a die-casting machine to obtain a tourbillon bracket blank, wherein the die-casting temperature of the die-casting machine is 80-1200 ℃, the die locking force is 100-1000 kg/cm2, the alloy melting temperature is different, for example, the tin-osmium alloy can be melted into a liquid state at the lowest temperature of 80 ℃, so that the casting die and the blank can be removed later; alternatively, the above metals or alloys of these metals include, but are not limited to: the metal or metal alloy which can react with hydrochloric acid or nitric acid or sulfuric acid is only required to be capable of cleaning out the tourbillon bracket blank by using acid liquor or other cleaning agents after electroforming/electroplating; optionally, polishing the surface of the tourbillon bracket blank by one or more methods of laser polishing, chemical polishing, electrolytic polishing, fluid polishing and magnetic grinding polishing;
secondly, shielding the upper surface or the bottom of the tourbillon bracket blank by a shielding method, and electroforming/electroplating a tourbillon bracket with a hard gold layer only at the bottom or the upper surface of the tourbillon bracket blank; the shielding treatment on the upper surface or the bottom of the blank is only one method in the embodiment, and is not used as a limit to the shielding range; in order to electroform/electroplate a suitable tourbillon bracket, hard golden layers with different shapes can be formed on a tourbillon bracket blank by adopting different local electroplating methods, including but not limited to an upper surface or a bottom; alternatively, the electroforming/electroplating method employs a dedicated jig method, a wax-made insulation method, painting of insulating ink, or the like;
thirdly, plating hard gold with the thickness of 0.1mm-5mm on the tourbillon bracket blank by adopting an electroforming or electroplating process, wherein the hardness of the hard gold is between Vickers hardness HV40-HV 180; the cyanide-free sulfite gold plating solution is preferably used as the plating solution, and comprises 9-13g/L of gold sulfite salt, 50-120g/L of alkali sulfite salt, 2-10g/L of 3-nitrobenzenesulfonate, 25-40g/L of organic polyamine, 15-25g/L of organic phosphonate, 0.05-0.15g/L of polyol compound, 500mg/L of imine-containing high molecular polymer and 400mg/L of thiourea derivative, wherein the content of gold sulfite salt is calculated by gold element; optionally, the cyanide-free sulfite gold plating solution further comprises a hardening agent, wherein in the hardening agent, relative to 100-200 g of phosphate, the content of hydrogen phosphate is 50-200 g, the content of alkali sulfite is 30-120 g, the total content of antimony salt and selenium salt is 0.01-2 g, and the content of complexing agent is 0.01-5 g;
(IV) after the electroforming/electroplating process is finished, soaking the tourbillon bracket blank in a hydrochloric acid solution, a nitric acid solution or a sulfuric acid solution, or soaking other cleaning agents capable of removing the tourbillon bracket blank, wherein the soaking solution is not used for limiting the claims; and cleaning the tourbillon bracket blank made of the removed metal or metal alloy to obtain the hard gold tourbillon bracket with the color of over 99 percent.
As a further improvement, before the step (2), the tourbillon bracket blank is subjected to finish machining treatment, including oil removal, deoxidation and cleaning; firstly, carrying out alkali washing on a tourbillon bracket blank by using high-strength alkali liquor prepared from sodium hydroxide and sodium carbonate or trisodium phosphate; then, the tourbillon bracket blank is connected with the positive pole of a power supply, a plating pen dipped with activation liquid is connected with the negative pole of the power supply, the plating pen is contacted with the surface of the tourbillon bracket blank to remove the oxidation film on the metal surface of the tourbillon bracket blank, and the subsequent plating metal is combined with the base surface of the tourbillon bracket blank conveniently; and finally, cleaning the tourbillon bracket blank by using an ultrasonic vibrator.
Example 3
Firstly, preparing a tourbillon bracket blank by using wax;
secondly, coating a conductive layer on the surface of the wax blank; optionally, plating silver oil, copper oil, nano metal powder oil, conductive powder or conductive powder oil on or soaking, spraying and coating the silver oil, copper oil, nano metal powder oil, conductive powder or conductive powder oil on the surface of a wax blank by a vacuum plating method;
considering the requirement of the tourbillon bracket on the structural thickness, a shielding method is adopted, no conducting layer is made on the surface or the bottom of the tourbillon bracket blank, and the hard tourbillon bracket is only electroformed/electroplated on the bottom or the surface of the tourbillon bracket blank; the shielding treatment on the upper surface or the bottom of the blank is only one method in the embodiment, and is not used as a limit to the shielding range; as long as the requirements of the tourbillon bracket are met, a shielding or non-conductive layer with any shape can be made on the tourbillon bracket blank; or more conveniently, in S2, directly plating or soaking, spraying and coating the surface of the wax blank by a vacuum plating method according to the requirement to form a shape meeting the requirement;
fourthly, plating hard gold with the thickness of 0.1mm to 3mm on the tourbillon bracket blank coated with the conductive layer by adopting an electroforming/electroplating process, wherein the hardness of the hard gold is between Vickers hardness HV40 to HV 180; the cyanide-free sulfite gold plating solution is adopted as the electroplating solution, and comprises the following components: the content of gold sulfite salt calculated by gold element is 8-15g/L, the content of alkali sulfite salt is 30-150g/L, the content of 3-nitrobenzenesulfonate is 1.5-12g/L, the content of organic polyamine is 20-45g/L, the content of organic phosphonate is 10-30/L, the content of polyol compound is 0.03-0.2/L, the content of high molecular polymer containing imine is 200-600mg/L and the content of thiourea derivative is 150-450 mg/L; the composite material also comprises a hardening agent, wherein in the hardening agent, relative to 100-200 g of phosphate, the content of hydrogen phosphate is 50-200 g, the content of alkali metal sulfite is 30-120 g, the total content of antimony salt and selenium salt is 0.01-2 g, and the content of complexing agent is 0.01-5 g;
after the electroforming or electroplating process is finished, optionally, putting the electroformed/electroplated tourbillon flywheel bracket blank into paraffin removal water at 100 ℃ for boiling, melting the paraffin blank in the electroformed/electroplated hard golden tourbillon flywheel bracket semi-finished product at high temperature, and then boiling out, wherein the paraffin removal product is required to have no residual paraffin; or the tourbillon bracket blank after electroforming/electroplating is put into an oven or an oven for heating, or a fire gun can be used for spray burning; the method is that the wax is peeled from the hard gold tourbillon bracket as far as possible by using a proper physical or chemical means in advance without damaging the hard gold tourbillon bracket; putting the hard gold tourbillon bracket stripped of wax into nitric acid or sulfuric acid to dissolve the conducting layer, and then burning by a fire gun or an oven to remove the conducting layer of the product, thereby obtaining a finished product of the hard gold tourbillon bracket; then, cleaning the finished product of the hard gold tourbillon bracket by using a cleaning agent to obtain the hard gold tourbillon bracket with the color of over 99 percent;
and (VI) grinding, polishing/calendering and cleaning the electroformed/electroplated hard gold tourbillon bracket.
Please refer to the attached drawings. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Claims (5)
1. A method for preparing a hard gold gyroscope flywheel bracket is characterized by comprising the following steps:
(1) the tourbillon bracket blank is manufactured by adopting a metal material or wax with common hardness, gold or non-gold, through one or more production processes of die casting, extrusion, oil pressure and reverse die;
(2) carrying out surface treatment on the tourbillon bracket blank;
(3) taking the tourbillon bracket blank as a substrate, and depositing and forming a hard gold layer with the thickness of 0.02-5mm, the color forming rate of 99% or more and the Vickers hardness of HV40-HV180 on the surface of the substrate through an electroplating/electroforming process;
(4) after a tourbillon bracket blank made of non-gold metal material or wax is electroplated/electroformed, the tourbillon bracket blank is removed by a physical or chemical method, only a hard gold layer is reserved, and the color of the hard gold layer is 99% or more;
(5) and (3) machining the electroplated/electroformed tourbillon bracket semi-finished product by adopting a mechanical or manual mode according to the precision requirement of the tourbillon bracket.
2. A method for preparing a hard gold tourbillon stand according to claim 1, wherein in step (1), the non-gold metal material comprises cu/fe/al/zn/sn/bi or an alloy of these metals.
3. A method for preparing a hard gold tourbillon according to claim 1, wherein step (2) comprises: carrying out die holding polishing treatment on the surface of the tourbillon bracket blank made of metal material with common hardness of gold or non-gold; and coating a conductive layer on the surface of the tourbillon bracket blank made of wax.
4. The method as claimed in claim 3, wherein the polishing process comprises: polishing the surface of the tourbillon bracket blank by one or more methods of a laser polishing method, a chemical polishing method, an electrolytic polishing method, a fluid polishing method and a magnetic grinding polishing method.
5. A method for preparing a hard gold tourbillon stand according to any one of claims 1 to 4, wherein a portion of the surface of the blank of the tourbillon stand made of a metallic material other than gold is masked by a masking method, the masking material being a non-conductive material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023051640A1 (en) * | 2021-09-30 | 2023-04-06 | 深圳市联合蓝海黄金材料科技股份有限公司 | Cyanide-free gold electroplating solution and use thereof, method for preparing gold bump by electroplating, gold bump, and electronic component |
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| CN109881218A (en) * | 2019-02-22 | 2019-06-14 | 深圳市金泰隆珠宝有限公司 | A kind of solid gold jewelry surface treatment processing technique |
| CN110607539A (en) * | 2019-09-29 | 2019-12-24 | 深圳市金久缘珠宝有限公司 | Processing technology of gold jewelry |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023051640A1 (en) * | 2021-09-30 | 2023-04-06 | 深圳市联合蓝海黄金材料科技股份有限公司 | Cyanide-free gold electroplating solution and use thereof, method for preparing gold bump by electroplating, gold bump, and electronic component |
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