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EspañolCoating treatment is a key surface treatment process in Engine Mold manufacturing. It forms a coating of specific materials on the surface of the mold to improve the hardness, wear resistance, corrosion resistance and other properties of the mold.
Material selection and preparation:
Coating material selection: Coating material selection is the primary consideration in coating processing. Commonly used coating materials include chromium plating, nickel plating, nitride coating, tungsten titanium coating, etc., which have the characteristics of improving hardness, wear resistance and corrosion resistance.
Material preparation: Before plating treatment, the mold surface must undergo strict preparation. This includes removing surface oil, residual polish and other contaminants to ensure surface cleanliness. Sometimes, pretreatment is required, such as pickling, phosphating, etc., to improve coating adhesion.
Coating process selection:
Electrochemical Deposition (Electroplating): Electroplating is a common plating process that forms a metal coating by depositing metal ions on the surface of the mold. Electroplating usually uses a plating solution. By applying electric current in the electrolyte, the metal ions are reduced into metal and deposited on the surface of the mold. This process provides a uniform, dense coating.
Physical Vapor Deposition (PVD): PVD is a highly sophisticated coating technology that evaporates or sputters metal onto the surface of a mold in a vacuum environment to form a uniform and dense coating. PVD can achieve precise control of the mold surface and provide a coating with high hardness and strong adhesion.
Coating parameter control:
Controlling temperature and concentration: During the plating process, the temperature and concentration of the plating solution need to be precisely controlled. Changes in these parameters directly affect the uniformity, density and composition of the coating.
Current density adjustment: In the electroplating process, current density is an important control parameter. Adjusting the current density can affect the uniformity and thickness of the coating, ensuring that the coating forms a consistent thickness across the entire mold surface.
Post-coating treatment:
Heat treatment: Some coatings may require heat treatment to improve the hardness, wear resistance and stability of the coating. The heat treatment process is usually performed in a high-temperature environment and can improve the crystal structure and properties of the coating.
Polishing and Conditioning: After coating is complete, polishing may be required to improve the surface finish. In some cases, the thickness of the coating can also be adjusted through polishing to ensure that the coating meets the design requirements.
