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Cyanide-free 18k gold electrocasting solution and preparation method and application thereof

A technology of electroforming solution and solution, which is applied in the direction of electroforming and electrolysis, can solve the problems affecting the quality of 18K gold jewelry, the threat to workers and the environment, and the impact on production efficiency, so as to achieve easy control of gold content, reduce labor intensity, The effect of improving productivity

Active Publication Date: 2019-03-22
NANJING INST OF PROD QUALITY INSPECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing 18K gold has the following problems: the improvement of hardness has entered a bottleneck period, and it is difficult to further improve; the electroforming liquid required for the preparation of existing 18K gold jewelry needs to be prepared on site due to its poor stability, which increases the labor intensity of workers and affects production efficiency; The electroforming solution also has defects such as poor dispersion ability and poor deep plating ability, which will affect the quality of 18K gold jewelry; electroforming often uses toxic substances containing cyanide, which poses a great threat to workers and the environment; due to the defects of the preparation process , leading to problems such as low yield

Method used

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  • Cyanide-free 18k gold electrocasting solution and preparation method and application thereof
  • Cyanide-free 18k gold electrocasting solution and preparation method and application thereof
  • Cyanide-free 18k gold electrocasting solution and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of cyanide-free 18k gold ornaments, characterized in that: comprising the following steps in sequence:

[0025] 1) Plate making: Carve the design drawing into a wax plate or 3D print the design drawing into a wax plate, cast it into a silver plate through lost wax, and then trim the silver plate as a master;

[0026] 2) Molding, mold opening, and mold inversion: The film pressing steps are: insert the prepared master plate between two semi-raw vulcanized rubbers, and apply a release agent (Datian brand oil-based release agent) between the two semi-raw vulcanized rubbers. ORDA-350A), under the condition of 150 ℃, press for 10 hours to fully mature and shape, and complete the film; the mold opening step is: after the mold is completed, take out the master plate, and engrave the liquid alloy backflow groove on the two semi-raw vulcanized rubber And the exhaust fine groove, complete the mold opening, and obtain the film; the step of pouring the mold is:...

Embodiment 8

[0051] Basically the same as Example 2, the difference is: in the preparation of the electroforming solution, in step A, keep warm for 25min, the consumption of aqua regia is 10mL per gram of gold, and the mass concentration of sodium sulfite solution is 15%; in step B, Stirring speed is 400r / min, continue to stir and keep warm for 15min after feeding; in step C, stir speed is 700r / min, continue stirring and keeping warm for 8min after adding; in step D, stir speed is 700r / min.

Embodiment 9

[0053] It is basically the same as Example 2, except that: in the preparation of the electroforming solution, in step A, keep warm for 60min, the consumption of aqua regia is 18mL per gram of gold, and the mass concentration of sodium sulfite solution is 25%; in step B, Stirring speed is 800r / min, continue to stir and keep warm for 40min after feeding; in step C, stirring speed is 1200r / min, continue stirring and keeping warm for 25min after adding; in step D, stirring speed is 1200r / min.

[0054] The performance table of each embodiment gained electroplating solution of table 2

[0055]

Stability / month

Dispersion ability / %

Deep Plating Ability

Example 1

＞12

87

6.5

Example 2

＞12

88

6.8

Example 3

＞12

85

6.2

Example 4

＞12

87.2

6.7

Example 5

5

80

5

Example 6

6

80

4.9

Example 7

5

79

4.8

Example 8

10

82

5.9

Example 9

10.5

...

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Abstract

The invention discloses a cyanide-free 18k gold electrocasting solution and a preparation method and application thereof. The cyanide-free 18k gold electrocasting solution is prepared from the raw materials by volume: 10-12 g / L of gold, 2.2-2.5 g / L of copper, and 0.6-1 g / L of indium. The electrocasting solution is high in stability, high in dispersibility, and high in covering power. The electrocasting solution can be prepared in advance, and therefore labor intensity is lowered, production efficiency is improved, and the quality of ornaments is improved. Toxic substances containing cyanide are not adopted, and therefore security is high. The gold content is easy to control, and therefore gold loss is reduced, and yield is improved. Hardness of a 18k gold ornament is improved, and stability of the ornament during wearing is better guaranteed, and embedded gemstones are prevented from loosing. The corrosion resistance, decoloring resistance and abrasion resistance of the 18k gold ornament are obviously improved.

Description

technical field [0001] The invention relates to a cyanide-free 18k gold electroforming solution, a preparation method and application thereof, and belongs to the field of 18k gold jewelry preparation. Background technique [0002] With the rapid development of modern industry and science and technology, the requirements for the surface properties of materials are getting higher and higher, and the surface treatment technology has also made great progress. Electroplating is one of the most effective methods in surface treatment technology, and its role and development trend have attracted great attention. The single metal coating of electroplating in the past is far from meeting the performance requirements and increasing needs of the metal coating. Alloy coatings composed of different metals can obtain a variety of special surface properties, and there are many types and a wide range of options. Alloy plating is the use of electrochemical methods to co-deposit two or more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/62C25D1/10
CPCC25D1/10C25D3/62
Inventor 王浩杰黄良平杨鹔张帆
Owner NANJING INST OF PROD QUALITY INSPECTION
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