Metallic or non-metallic appearance after the appearance of the metal if taken to the coloring, dyeing or other surface finishing treatment, usually have to take protective measures. To ensure that the appearance of fine decoration effect can be durable. The most commonly used method is the appearance of coating. Is usually the use of transparent paint on the surface after the decoration of the protective. This can not only adhere to the appearance of fine decorative color, but also can improve the appearance of corrosion and wear resistance. Because some of the paint itself has a certain gloss, so this appearance is also called cover light treatment.

In the process of vacuum plating or in the use of color change, will affect its decorative or protective effect. Should be paid attention to in the process of plating, proper disposal. The discoloration of the coating is mainly due to the corrosion resistance of the coating in the corrosive medium (including air), and the appearance of oxidation or other chemical reactions.
The coating of anti - color treatment, can be in the following aspects to be noted:

First, optimize the electroplating process, strict implementation of the technical specifications. In this way, the tendency of coating discoloration can be reduced at a high level. For example, to prevent poor cleaning after plating, the current density is too high, the temperature on the high side of the plating solution, are conducive to the prevention of tin layer yellow.
The two is to re plating on the plating, and then coating a layer of 0.2-0.25m gold,. For example, copper alloy, in particular, imitation gold plating easily discoloration. For gold a precious one metal, color is not easy in the air, can make the plating product does not change in a long time. This process is widely used in Japan, China, Hongkong and other places.
Three is coated on the coating, including coating and other thin layer of organic maintenance film. Typical silver coating of the anti color processing, such as electrophoresis coating process protection, which is currently methods commonly used in the musical instrument industry, silver coating with organic solvent maintenance layer, such as BY-2DJB-823TX Silver Tarnishing prevention agent, silver coating the surface to form a layer of solid film, the shielding effect on the corrosive media, prevent discoloration.

The four is to improve the anti - Discoloration property of the coating by passivation and sealing. For example, the red passivation technology of zinc coating is less resistant to corrosion, and the passivation film can be closed again after passivation. For example, the copper coating immersed in containing benzene and three nitrogen wow solution, because of the appearance form adsorption film and coating anti tarnishing capability is improved.
There are strict technical methods and specifications for the anti - color - changing treatment process. Only strict implementation, to achieve the purpose of anti discoloration of course, each layer of the cause of the different color, anti discoloration methods and methods are not the same.

But in fact these three kinds of gold or the existence of the copper content of the difference --- containing copper, vacuum plating rose gold purity: Although the red gold, rose gold, pink gold name can be replaced with each other. The heavier the red. Because gold is gold, copper is the red rose. A rare rose gold is a gold 75 carat gold. Because the rose gold is a gold alloy, so the so-called pure rose gold "argument is not correct the highest gold content rose gold is a known as the" crown gold (crowngold22 K gold, this is a coin with gold. 18K gold can be made of 25% copper and 75% gold smelting and.
Compared with the commonly used surface treatment method is a mechanical polishing, the appearance of processing in the surface of the substrate material on the formation of a layer of mechanical, physical and chemical properties of different surface layer process. The purpose of the surface treatment to meet the corrosion resistance, wear resistance, decoration or other special functional requirements. For metal castings. Chemical treatment, surface heat treatment, spraying the surface, the appearance of the disposal is the workpiece surface cleaning, cleaning, burr, to the oil, to oxide skin, etc.