NdFeB Magnet Coating

Neodymium magnets can be coated with different materials to protect them from corrosion and improve their durability. 

Nickel (Ni-Cu-Ni): The most common coating is nickel (Ni-Cu-Ni), which involves a triple-layer coating of nickel, copper, and nickel. This coating provides excellent corrosion resistance and durability and gives the magnets a silver-like appearance.

Zinc (Zn): Another coating option is zinc (Zn), often used for cost-effective applications. However, zinc-coated magnets are more prone to corrosion than nickel-coated ones. Zinc-coated magnets generally appear dull gray or colorful.

Epoxy Resin: Neodymium magnets can also be coated with an epoxy resin, providing a layer of protection against corrosion and making them more resistant to chipping or breaking. Epoxy-coated magnets are often used in applications where they may be exposed to moisture.

Gold (Au): Gold coating provides excellent corrosion resistance and is often chosen for applications where aesthetics are essential. Gold-coated neodymium magnets have a distinctive gold appearance.

Black Epoxy: Besides clear epoxy coatings, neodymium magnets can be coated with black epoxy for a more discreet appearance. This coating also protects against corrosion.

Phosphating: Some neodymium magnets are coated with a phosphate layer to improve corrosion resistance. Phosphate coatings can be either black or gray.

Chrome: Chromium coating, also known as chrome plating, involves applying a thin layer of chromium onto magnets, particularly neodymium magnets. This process enhances the magnet’s durability and appearance.

Teflon (Molded PTFE): Teflon coating requires molds and tooling, affecting its cost, but offers excellent protection for medium to large magnets against breakage, impact, and corrosion. It is ineffective for small magnets and is ideal for safeguarding rare-earth magnets from humidity, fluids, and autoclave conditions. The typical thickness ranges from 1.5 to 3 mm, with a maximum working temperature of 250 °C (approximately 482 °F). Teflon coatings are commonly used in the medical and food industries due to their non-stick properties and chemical resistance.

Everlube: Everlube is a specialized coating designed to provide superior adhesion and corrosion protection for rare earth magnets, particularly neodymium magnets.

Lowewe (or Lowewe-B):
Lowewe is an advanced proprietary coating that provides superior corrosion protection, especially in humid or chemically aggressive environments. It also offers enhanced adhesive compatibility, making it ideal for gluing or over-molding applications. Lowewe-coated magnets have a dark gold to bronze matte finish and are frequently used in automotive sensors, robotics, and high-performance electronic assemblies. Its appearance is both functional and aesthetically unique.