1. What is electroplating?
The electroplating of popular jewelry refers to decorative electroplating. The so-called decoration is like the beauty and makeup of people, which makes people dazzling, and the makeup of jewelry is to make the product more beautiful, but the material used for makeup is metal. When people wear makeup, they apply several layers of makeup to complete the makeup process. The same is true for product makeup. The makeup process is completed by plating several layers of different metals with a combination of various metals.
The thickness of the coating is expressed in microns. Generally, the diameter of the hair is seventy or eighty microns, and the precious metal coating is about a few thousandths of it.
The structure of the electroplating layer: the structure of the electroplating layer from the inside to the outside is generally: bottom layer (alkali copper) – bright layer (acid copper) – sealing layer (nickel or palladium) – surface layer (gold, silver, rhodium, etc. ) – sealing layer (electrolytic or electrophoretic or protective paint)
2. Electroplating color
according to the value
1) Precious metal plating: such as platinum, gold, palladium, silver;
2) General metal plating color: such as imitation platinum, black gun, nickel-free tin-cobalt, ancient bronze, ancient red copper, ancient silver, ancient tin, etc.
According to the complexity of the process
1) General plating color: platinum, gold, palladium, silver, imitation platinum, black gun, nickel-free tin-cobalt, pearl nickel, black lacquer;
2) Special plating color: antique plating color (including oiled patina, dyed patina, cast line patina), two-color, sandblasted plated color, brushed line plated color, etc.
Platinum: The electroplating metal is rhodium (Rh), which is an expensive and rare metal with a silvery white color; stable in nature, good wear resistance, high hardness, and long color retention period, it is one of the best electroplating surface colors; the thickness is above 0.03 microns , generally using palladium as the bottom layer has a good synergistic effect, and the sealing can be stored for more than 5 years.
Imitation platinum: The electroplating metal is copper-tin alloy (Cu/Zn), and imitation platinum is also called white copper tin. Can be placed for half a year.
Gold: Gold (Au) is a precious metal, a common decorative coating; the composition ratio is different, and there are different colors: 24K, 18K, 14K, and in this order from yellow to blue, there will be some differences in color between different thicknesses; The properties are stable, and the hardness is generally 1/4-1/6 of that of platinum; its wear resistance is general, so its color retention period is general.
Rose gold: The material is gold-copper alloy. According to the proportion, the color is between golden yellow and red; compared with other golds, it is more lively, the color control is difficult, and there is often color difference; the color retention period is not as good as other golds, and it is easy to change color.
Silver: Silver (Ag) is a white metal, very active, and silver is easily discolored when it encounters sulfides and chlorides in the air; silver plating is generally protected by electrolysis and electrophoresis to ensure the life of the plating. Among them, the life of electrophoresis protection is longer than that of electrolysis, but it is a little yellowish, and the glossy products will have some small pinholes, and the cost will also increase; electrophoresis is formed at 150 ° C, and the protected products are not easy to rework, and often Scrap; silver electrophoresis can be stored for more than 1 year without discoloration.
Black gun: metal material nickel/zinc alloy (Ni/Zn), also known as gun black or black nickel; the plating color is black, slightly gray; the surface stability is good, but the low position is easy to shine; the plating color itself contains nickel and cannot be used for Nickel-free plating: The plating color is not easy to be reworked and reformed.
Nickel: Nickel (Ni) is grayish-white, and is a metal with good density and hardness; it is generally used as an electroplating sealing layer to improve electroplating life; it has good purification ability in the atmosphere and can resist atmospheric corrosion; nickel is relatively hard It is brittle, so it is not suitable for electroplating products that need to be deformed; when nickel-plated products are deformed, the coating will peel off; nickel may cause skin allergies to some people.
Nickel-free tin-cobalt plating: the material is tin-cobalt alloy (Sn/Co), the color is black, close to the black gun (slightly grayer than the black gun); it is a nickel-free black coating; the surface is relatively stable, and the plating is low and easy to shine; the color is not easy to coat Rework and rebuild. Pearl nickel: its material is nickel, also known as sand nickel; it is generally used as the pre-plating bottom layer of the fog color process; the color is gray, non-bright mirror, and has a soft fog-like appearance, such as the feeling of satin. The degree of atomization is unstable, and in the absence of special protection, due to the influence of sand-forming materials, there is discoloration in the case of skin contact.
Fog color: the surface color is added on the basis of pearl nickel, which has atomization effect and no luster; its electroplating method is pre-plating pearl nickel; because the atomization effect of pearl nickel is difficult to control, the surface color is inconsistent, and it is easy to have color difference; this plating method The color should not be nickel-free electroplating and post-plating stone; this color is easy to be oxidized, so special attention should be paid to protection.
Antique: Antique has three process routes and effects
Oiled antique color: Wipe black antique gold oil on the bright metal surface layer and then spray paint for protection, the overall color is uneven, bright, and there is no stripe feeling. Commonly oiled antique silver.
Polished patina: The metal layer is plated with black gun or nickel-free tin-cobalt and then polished with wire spray paint for protection. The overall color is black and white, with a sense of contrast and line. Commonly plated ancient bronze / ancient red copper / ancient silver.
Antique dyeing: just change the black plating to black, but the black effect is different. For example, the effect of ancient silver dyed black is tile blue. Such as ancient red, ancient coffee, and ancient color need to be sprayed with protective paint to ensure the life of electroplating. The general storage life is more than one year.
Ancient bronze: Bronze is also known as copper-zinc alloy. The process is: bright copper bronze → black plating → polishing → painting. After the ancient bronze is electroplated, it needs to be protected by baking with protective paint. The ancient bronze has strong alkalinity, and the rhinestones with the bottom attached to the drill claw products are easily damaged, which makes the rhinestones flowery and the brightness decreases. Bronze copper: The color is red, and the process is: bright copper plating → black plating → wire polishing → painting. Its surface layer is soft and lively, and it is easy to change color when combined with carbon dioxide and sulfide in the air. After the bronze copper is electroplated, it needs to be protected by a protective paint.
Bright black paint: It is essentially a black electrophoresis process, and the black layer is electrophoretic paint; compared with the sprayed bright black paint, the electroplated bright black paint has a very good bonding force; compared with the gun black, the color is darker, but the metal texture is lacking. Black paint curing requires a high temperature of 150 ℃. Plastic accessories, acrylic, and turquoise cannot be connected or clamped before plating, and electroplated bright black paint is not suitable for materials that need to be deformed. After shaping, the black paint is easy to fall off. Brush line electroplating: brush lines on copper after copper plating, and then add surface color. It has a sense of lines; its appearance color is basically the same as the general plating color, the difference is that there are lines on the surface; the brushed lines cannot be nickel-free electroplating, and its life cannot be guaranteed due to nickel-free electroplating.
Sandblasting: Sandblasting is also one of the electroplating fog colors. It is after sandblasting on copper plating and then electroplating; its matte surface is sand-like, and the same fog color is more obvious than the sand-like effect; like brush plating, nickel-free electroplating cannot be done.
Electrophoretic paint: Generally stable and poor surface coating, in order to prevent surface discoloration, after electroplating E-coating, it can separate the direct contact between the coating and the air, so that the gap is closed, which can play a good anti-discoloration and protection effect, but it needs to be It has been cured at a high temperature of 145 °C, so it is not suitable for electroplating for products that cannot be baked at high temperature or are prone to residual chemical solutions that are difficult to clean. Also, for other electroplating colors other than white, after E-coating, the color of the coating will change greatly and a ceramic-like effect will appear after being sealed on brushed lines or atomized products (because the paint is thicker).
Two-color electroplating: The two-color we generally talk about is rhodium and gold. The two-color method is divided into two types: gluing and pen plating. The quality of gluing is relatively good, but the cost is high, the process is complicated, and the product flow rate is slow. It is not suitable for complex products with small product area (the glue is easy to fall off during color matching) or extremely difficult to peel off the glue; the quality of pen plating is relatively high. Poor, but low cost, fast product flow between processes, suitable for products with small two-color area, and the type of pen plating solution is limited to pen gold plating and pen rhodium plating.
So, Here is types of plating color Jewelry, if you have more questions, please reach us directly, Thank you.