The color on the surface of metal jewelry is the true color. However, sometimes it is necessary to change the color of its surface in order to achieve special effects. For example, 18K gold jewelry is required to be as golden as pure gold, while 18K white gold jewelry (White K gold) is as pure white as platinum, which requires surface treatment of metal jewelry, so surface treatment manufacturers must use The pvd coating machine is used to change the appearance of the workpiece through vacuum ion physical vapor deposition.

pvd coating machine coating is a more complicated process. It not only protects the metal surface of jewelry, but also makes the surface of metal jewelry more beautiful. Metal jewelry coatings are divided into natural color coatings and heterochromatic coatings. The natural color coating means that the color of the coating is the same as that of the metal substrate of the jewelry, and the chemical composition of the metal substrate of the jewelry and the coating is also basically the same. For example, 18K gold jewelry is plated with 18K gold, and 14K gold jewelry is plated with 14K gold. Heterochromatic coating means that the color and composition of the coating are different from those of the jewelry metal substrate, for example, 18K gold jewelry is plated with 24K gold or white rhodium.
        Coating is the process of electrolytically depositing a coating with a desired morphology. The basic process of electroplating (taking gold plating as an example) is to immerse the material to be plated in a solution of metal salt (such as potassium gold cyanide) as the cathode. The metal gold plate is used as the anode, and after the DC power is turned on, a metal gold coating will be deposited on the material to be plated.
        Basic quality requirements for the coating layer:
        1. It is firmly combined with the base metal and has good adhesion.
        2. The coating is complete, the crystallization is fine and compact, and the porosity is small.
        3. Good physical, chemical and mechanical properties.
        4. There must be a coating thickness that meets the standards, and the coating should be evenly distributed.
        Metal jewelry parts will inevitably adhere to a layer of oil stains and oxide layers on the surface due to various processes and treatments before being coated with a pvd coating machine, and these oil stains and oxides will affect the quality of the coating. In order to ensure a plating layer that meets the electroplating quality, the dirt and oxides on the jewelry surface must be cleaned. In addition, after the metal mold of this jewelry is polished, the surface is rough and not refined enough. It is also difficult to plate a coating with firm bonding and good corrosion resistance on the surface of this material. The coating on the inner jewelry will peel off, bubble, pitting, mottled and other undesirable phenomena. Therefore, the various processes in the early stage of pvd coating machine coating should be precise.