Formula And Operation Skills Of Plastic Electroplating-18K Gold Plating Bath

Formula and operation skills of plastic electroplating-18K gold plating bath.
Huizhou Boluo Tenglong Technology Co., Ltd. serves you wholeheartedly! Mainly engaged in plastic hydroelectroplating processing, with plastic injection molding processing, mold processing and so on!
With the continuous improvement of people's living standards, there are more and more products that need gold plating, the gold plating layer has the characteristics of golden appearance, good electrical conductivity, low contact resistance, stable chemical properties, anti-discoloration, corrosion resistance, wear resistance and weldability, and is widely used in decorative gold plating such as jewelry, watches, works of art, integrated circuits, connectors and other IT industry gold plating. Because the gold plating solution is expensive and the one-time investment is large, it is very important to choose a good formula.
Today, I would like to share with you the formula and operation skills of 18K gold plating bath. 18K gold not only has the precious value of gold, but also has the advantages of strong ductility, high hardness and color illusion. With the popularity of the market, it has been widely used in our decorative electroplating in recent years, and has become the mainstream color plating seed.
I. the definition of 18K.
18K gold refers to an alloy composed of 75% gold and 25% other metals, commonly known as 18K gold with rich colors, including white karat gold, yellow karat gold, rose gold, black gold and so on. The picture above shows LOVE18K rose gold ring in order to obtain 18K gold, nickel ion or copper ion can be added to the acid bath as gold-nickel or gold-copper alloy, and the amount of addition depends on the color obtained. A small amount of silver ions can also be added to adjust its color.
2. hanging plating 18K gold, copper, antimony, full bright rose gold coating.
Red K Gjinzom, people are most familiar with rose gold, the reddish color, neutralizing the luxury of yellow karat gold and the cold of white karat gold, making people feel warm and more suitable for the yellowish skin tone of Asians. The coating is used for decorative rose gold bright gold plating, it has high hardness and good wear resistance, and the appearance is both beautiful and durable.
(1) the formula and operating conditions of rose red 18K gold-copper-antimony alloy plating:
Potassium gold cyanide 6~12g/L.
Potassium antimony tartrate 4.5g/L.
Potassium dihydrogen phosphate 60g/L.
Copper (added with copper coordination salt) 5g/L.
EDTA-2Na20g/L.
The temperature is 4550 ℃.
Ph 4.5-6.0.
Current density 1.0~1.5/dm2.
Stirring cathode movement or rotation movement.
Anode plate stainless steel plate.
Third, the luxurious yellow is plated with 18K gold.
Take the gold plating process of copper parts as an example: hanging the package of "de-oiling" water washing "pickling"bright nickel plating" water washing "18K gold plating"two-way recovery" water washing "hot water washing" drying "inspection" packaging.
(1) the formula and operating conditions of yellow series 18K gold plating solution:
Potassium gold cyanide 7~10g/L.
Potassium cyanide 50~60g/L.
Potassium silver cyanide 2.0~2.5g/L.
Ammonium hydroxide 50~60g/L.
Potassium carbonate 10g/L.
Ph 11.0-12.5.
The temperature is 1823 ℃.
Cathode current density 0.3~0.6A/dm.
Stirring cathode (25 times / min) or rotating movement.
Stainless steel plate made of anode material.
(2) to master the main points:
1 the ratio of potassium gold cyanide to potassium silver cyanide is 100: 20: 25, that is, each liter is supplemented with 10 g potassium gold cyanide and 2.5 g potassium silver cyanide.
(2) it is better for potassium cyanide to be kept at 45~60g/L, and a low level will affect the electrical conductivity and coordination. Ammonium hydroxide should always be supplemented in an appropriate amount (but not too much). It can adjust the pH value and increase the brightness of the coating.
(3) when the gold content of the solution is on the low side, the coating appears the phenomenon of spongy gloss, so the coating should be fed quickly.
(4) the temperature should be strictly controlled at 18-23 ℃, and the cathode current density should be 0.3~0.8A/dm.