With the continuous improvement of people’s living standards, the need for gold-plated products more and more gold-plated layer with golden appearance, good conductivity, low contact resistance, chemical stability, anti-color, corrosion resistance, wear resistance and solderability And other features, widely used in jewelry, watches, works of art decorative gold; integrated circuits, connectors and other IT industry gold-plated. Because gold-plated solution is expensive, one-time investment is large, so it is very important to choose a good recipe.
Today to share with you plating 18K gold plating formula and operating skills 18K gold not only has the precious value of gold, but also has a strong scalability, high hardness, the advantages of color illusion is very popular. With the popularity of the market, in recent years in our decorative plating is also widely used to become the mainstream color plating.
1、 18K definition
18K gold refers to the alloy containing 75% gold and 25% of other metals, commonly known as 18K gold K gold rich colors, white K gold, yellow gold, rose gold, black gold and so on. The above figure shows LOVE18K rose gold on the ring to get 18K gold can be added in the acid bath nickel ions or copper ions as gold – nickel or gold – copper alloy, plus the amount of the prevailing color prevail. You can also add a small amount of silver ions to adjust its color.
2、Hanging plated 18K gold and copper antimony all bright rose gold coating
Red K gold, people are most familiar with the rose gold, reddish color, and in the yellow K gold luxury and white K gold cold, people feel warm, but also more suitable for Asian people yellowish complexion. The coating is used for decorative rose gold bright gold plating, it has a high hardness and good wear resistance; appearance is both beautiful and durable.
(1) plating rosemary red 18K gold and copper antimony alloy formula and its operating conditions: gold cyanide potassium 6 ~ 12g / L; tartrate potassium antimony potassium 4.5g / L; potassium dihydrogen phosphate 60g / L; copper (with copper PH = 4.5 ~ 6.0; current density of 1.0 ~ 1.5 / dm2; stirring cathode moving or rotating movement; anode plate material stainless steel plate; temperature of 4.5 ~~ 6.0; current density 1.0 ~ 1.5 / dm2; stirring cathode moving or rotating movement; anode plate material stainless steel plate;
3, hanging plated luxury yellow 18K gold
To copper pieces of gold-plated process as an example: on the hanging → to the oil → washing → pickling → washing → plating nickel → washing → plating 18K gold → → two recycling → washing → hot water washing → drying → inspection → packaging.
(1) plating yellow 18K gold liquid formula and its operating conditions: gold cyanide potassium 7 ~ 10g / L; potassium cyanide 50 ~ 60g / L; silver cyanide potassium 2.0 ~ 2.5g / L; ammonium hydroxide 50 ~ 25g / L; potassium carbonate 10g / L; pH 11.0 ~ 12.5; temperature 18 ~ 23 ℃; cathode current density 0.3 ~ 0.6A / dm; stirring cathode (25 times / min) or rotating anode material stainless steel
(2) to master points:
① added potassium cyanide potassium and potassium cyanide ratio of 100: 20 ~ 25, that is, per liter of 10g potassium cyanide supplemented with 2.0 ~ 2.5g silver cyanide potassium; potassium cyanide Should be maintained at 45 ~ 60g / L is preferred, low will affect the conductivity and coordination effect. Ammonium hydroxide should always be supplemented with some (but not excessive), it can adjust the pH value and increase the brightness of the coating; ③ solution of gold content is low, the coating appears sponge-like matte phenomenon, should speed feeding; The control temperature is 18 to 23 ° C, and the cathode current density is preferably 0.3 to 0.8 A / dm.
