Epoxy Coated Neodymium Magnets – Waterproof Anti-Corrosion Rare Earth Magnets for Marine, Automotive & Industrial Motors

If you’ve struggled with premature rust, demagnetization and shortened service life of ordinary nickel-plated neodymium magnets in humid, coastal, saltwater or high-temperature working environments, our epoxy coated neodymium magnets deliver the long-term reliable anti-corrosion magnetic solution you’ve been searching for.

Conventional bare or nickel-plated NdFeB magnets only carry a thin metal protective film, which easily gets scratched and cracked during installation. Once moisture, salt fog or chemical vapor penetrates the coating, the magnet core oxidizes rapidly, loses magnetic force and damages the whole equipment. Our epoxy encapsulated magnets completely solve this industry pain point with one-piece seamless thick epoxy resin sealing technology.

Each magnet core is forged from high-grade sintered NdFeB rare earth raw material, ranging from N35 to N52, including high-temperature resistant SH/EH/TH series that stably maintain magnetic performance under continuous high heat up to 180°C. The dense matte black epoxy layer forms a fully airtight isolation barrier, fully blocking water vapor, salt spray, weak acid and corrosive gas. Our epoxy magnets pass 500+ hours salt spray testing, far exceeding the anti-rust performance of standard nickel plating, making them the ideal magnetic component for harsh working conditions such as marine equipment, coastal factory workshops and outdoor monitoring devices.

Beyond outstanding corrosion resistance, the soft epoxy outer shell brings multiple extra practical advantages. It delivers excellent shockproof and anti-collision performance, preventing brittle neodymium cores from cracking and chipping during transportation, assembly and long-term operation. The smooth non-conductive epoxy surface also reduces eddy current loss when used in BLDC motors, generators and electromagnetic sensors, effectively improving motor energy conversion efficiency and lowering equipment energy consumption.

We stock ready-made epoxy magnets in disc, square block, ring and arc segment shapes for motor rotors and stators, and fully support OEM customization per your technical drawings. We can adjust outer diameter, thickness, arc angle, magnetization direction (radial, parallel, multi-pole), epoxy color and magnetic grade to match your unique product design. Multiple surface coating thickness options are available to balance cost and protection performance.

Our epoxy coated rare earth magnets serve dozens of core industries: new energy vehicle drive motors, permanent magnet wind power generators, marine magnetic couplings, automotive sensors, outdoor electronic monitoring equipment, medical testing instruments, industrial automation fixtures and power tool components. Whether you need small prototype sample batches or mass bulk production orders, our factory provides stable consistent batch quality with strict full inspection of magnetic flux, dimensional tolerance and coating integrity before delivery.

Upgrade your magnetic components with our industrial-grade epoxy neodymium magnets to cut equipment maintenance costs, extend product service life and boost your product competitiveness in harsh environment markets. Contact our technical team today to get free samples and customized technical solutions.