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A kind of cyanide-free electroforming gold solution and electroforming gold method

A gold solution, electroforming technology, applied in electroforming, electrolysis process and other directions, to achieve the effect of low porosity, simple formula and easy preparation

Active Publication Date: 2016-09-14
DECENT GOLD GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a cyanide-free electroforming gold solution and electroforming gold solution in order to solve the problem that the traditional use of highly toxic cyanide solution and the current use of cyanide-free sulfite solution are not stable enough in electroforming gold. In the method of casting gold, under the selection and improvement of different waveforms of bidirectional pulses, the periodic reversing pulsation pulse technology is introduced to obtain flat and compact, low porosity, high hardness, and not easy to deform in the electroforming solution with simple composition and easy preparation. thick gold layer

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  • A kind of cyanide-free electroforming gold solution and electroforming gold method

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Embodiment 1

[0025] Embodiment 1: the present invention provides a kind of cyanide-free electroforming gold solution and electroforming gold method, the mass concentration of each component in the solution formula is: potassium chloroaurate (gold ion concentration meter) 15g / L, ammonium chloride 80g / L, potassium chloride 40g / L, dipotassium hydrogen phosphate 30g / L, additive 0.6ppm (including cerium chloride 0.1ppm, saccharin 0.5ppm).

[0026] The method of electroforming gold is as follows: Step 1. Polish the cathode substrate successively with coarse sandpaper and fine sandpaper, soak the polished substrate in degreasing solution, and degrease for 40 minutes; heat the water bath to 30°C, and degrease The liquid formula is: sodium hydroxide 5g / L, sodium carbonate 40g / L, dipotassium hydrogen phosphate 40g / L.

[0027] Step (2) Soak in the activation solution for 10 seconds, the activation solution is 10% dilute sulfuric acid, take it out, rinse it with distilled water, and put the cathode s...

Embodiment 2

[0030] Embodiment 2: the present invention provides a kind of cyanide-free electroforming gold solution and electroforming gold method, the mass concentration of each component in the solution prescription is: chloroauric acid (gold ion concentration meter) 10g / L, complexing agent (hydrogen chloride 20g / L+potassium chloride 80g / L), potassium dihydrogen phosphate 20g / L, additive 0.1ppm (cerium nitrate 0.05ppm, 2,2‐bipyridine 0.05ppm).

[0031] The method of electroforming gold is as follows: Step 1. Polish the cathode substrate successively with coarse sandpaper and fine sandpaper, soak the polished substrate in degreasing liquid, and degrease for 30 minutes; heat the water bath to 40°C, and degrease The liquid formula is: sodium hydroxide 10g / L, sodium carbonate 20g / L, dipotassium hydrogen phosphate 50g / L.

[0032] Step (2) Soak in the activation solution for 20s. The activation solution is 2% dilute hydrochloric acid. After taking it out, rinse it with distilled water and put...

Embodiment 3

[0035] Embodiment 3: the present invention provides a kind of cyanide-free electroforming gold solution and electroforming gold method, the mass concentration of each component in the solution formula is: sodium chloroaurate (gold ion concentration meter) 40g / L, sodium chloride 160g / L, Sodium Sulfate 20g / L, Dipotassium Hydrogen Phosphate 20g / L, Sodium Dihydrogen Phosphate 30g / L, Additive 10.5ppm (5ppm Potassium Antimony Tartrate, 5ppm Sodium Lauryl Sulfate, 0.5ppm Saccharin), Solution pH 6, the working temperature is 60°C. Periodic commutation pulsation pulse parameters are: forward pulse frequency 500Hz, conduction time 80ms, duty cycle 70%, reverse pulse frequency 500Hz, conduction time 30ms, duty cycle 30%, average current density 2.0A / dm 2 . All the other unrelated methods are the same as in Example 1. After electroforming for 9.5 hours, a golden yellow, dense and flat gold layer was obtained, with a thickness of 240um, a mass fraction of 99.9%, and a hardness of 93Hv. ...

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Abstract

The invention relates to a cyanide-free electroforming gold solution and a gold electroforming method. The electroforming solution is prepared from a chloride serving as a gold main complex, a gold salt, a complexing agent, a conducting salt, a buffer agent and an additive. The electroforming solution is simple in material formula and easy to prepare, and does not contain cyanide. According to the electroforming solution, 75-99.9 percent by mass of a gold plate is adopted as an anode, and the gold salt or electrolyte is not needed to be supplied in the electroforming process; the pH of the electroforming solution is 3-6, and the working temperature is 20-60 DEG C. According to the method, a periodic reversal pulse technology is introduced, the operation conditions comprise pulse frequency being 300-2000Hz, positive duty cycle being 10-70 percent, negative duty cycle being 10-30 percent and average current density being 0.4-2.0A / dm<2>, and a thick gold layer of 99.9 percent by mass, which has thickness of over 200mu m, flat compactness, low porosity, high hardness and deformation prevention, can be produced by the method in 12 hours.

Description

technical field [0001] The invention relates to a cyanide-free electroforming gold solution and an electroforming gold method, in particular to a cyanide-free electroforming gold solution and a method for electroforming gold using periodic commutation pulsation pulse technology. Background technique [0002] The chemical stability of gold is very good. Gold is the only metal that does not react with oxygen at high temperature, and it hardly reacts with various acids and alkalis. The color of gold is bright and noble, and it has strong corrosion resistance and anti-tarnish ability. Gold alloys have different hues due to the addition of alloying elements, so they are favored by people and are often used in various jewelry, watches, and artworks. Gold electroforming process is a kind of electrodeposition forming technology, which is a special application of electroplating, and its principle is the same as that of electroplating. In the electroforming solution, the cathode is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D1/00
Inventor 袁心强雷婷郑利珊
Owner DECENT GOLD GRP CO LTD
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