Powder coating and electroplating are two widely adopted surface treatment technologies. The former applies polymer layers via electrostatic bonding for corrosion resistance and vibrant finishes, while the latter deposits metallic coatings through electrochemical processes to enhance conductivity and wear protection. This article outlines their mechanisms and industrial advantages.
Powder coating
Powder coating is a process that uses electrostatics to create a thin, uniform protective film on the surface of CNC machined parts. This process is suitable for all metal materials and can improve the strength, corrosion resistance and wear resistance of the parts.
Compared with anodized parts, powder-coated parts have greater impact resistance and can be presented in a variety of colors. Powder coating can be combined with sandblasting to produce machined parts with uniform and smooth surfaces and excellent corrosion resistance. In this process, the powder used can be a thermosetting or thermoplastic polymer.
Although powder coating is similar to the painting process, it involves attaching dry powder to the metal surface and curing it in an oven. To enhance corrosion resistance, the machined parts must be primed, and chromized or phosphated coatings are optional. Subsequently, dry powder is sprayed on these parts using an electrostatic spray gun and cured in an oven at 200ºC. In addition, multiple layers of coating can be applied as required to achieve a coating thickness range of 18 µm to 72 µm.
Electroplating
Electroplating is a surface treatment technique that increases the thickness of machined metal parts by depositing a metal coating on them. When applied to CNC machined parts, this process effectively protects the surface of the parts from corrosion, impact, heat and rust, thereby extending their service life. Electroplating is particularly suitable for metals such as chromium, cadmium, tin, copper, nickel and gold. Through electroplating, the bond between the substrate and its external coating can be enhanced. In addition, depending on the metal plated, it can also give the machined parts magnetic or conductive properties.
However, compared with other surface treatment techniques in CNC machining, electroplating is not environmentally friendly because it produces hazardous waste. If not handled properly, these wastes may cause serious pollution to the environment. In addition, the electroplating process requires specialized equipment, metals and chemicals, so it is time-consuming and costly, especially when metal parts require multiple layers of electroplating.(来源：UG学习堂小胥收徒)
MID focuses on high-precision parts manufacturing and services, providing one-stop solutions covering CNC precision machining, and has rich experience in diversified surface treatment processes. Including anodizing (multiple colors available), nickel/chrome electroplating, sandblasting polishing, passivation treatment and Teflon coating, etc., which can significantly improve the corrosion resistance, wear resistance and appearance texture of parts to meet the stringent requirements of medical, aviation, automotive and other industries. Relying on advanced surface treatment equipment and strict quality control, we ensure the quality delivery of the entire process from micron-level processing to terminal protection.
