High-performance rare earth permanent magnets engineered for maximum durability, anti-corrosive reliability, and industrial versatility.
Sintered Neodymium-Iron-Boron (NdFeB) permanent magnets are vital components of modern high-performance technology. However, their major weakness is a high susceptibility to corrosion. Structurally, sintered NdFeB is a multi-phase system consisting of the main magnetic phase (Nd2Fe14B) and a neodymium-rich grain boundary phase. This grain boundary phase is highly reactive and susceptible to electrochemical oxidation.
When exposed to damp air, saltwater, or acidic settings, a galvanic cell forms. The grain boundary phase acts as the anode, dissolving rapidly. This process leads to intergranular corrosion, which weakens the bond between particles and eventually causes the magnet to crumble into powder (a phenomenon known as "slacking"). To prevent this, manufacturers apply protective surface coatings, such as zinc-magnesium (Zn-Mg), multi-layer nickel-copper-nickel (Ni-Cu-Ni), epoxy resin, and advanced PVD treatments.
Recent developments in metallurgical coatings highlight the advantages of incorporating magnesium into traditional zinc-based plating. Zinc-magnesium (Zn-Mg) alloy coatings provide superior galvanic protection compared to pure zinc. Magnesium promotes the formation of a dense, highly stable protective layer on the surface, which slows the rate of oxygen diffusion.
By using Zn-Mg coatings, magnet manufacturers can achieve salt spray test (SST) resistances that exceed 1,000 hours without significantly increasing the coating's thickness. This level of protection is highly valuable for applications with tight dimensional tolerances, such as automotive electric power steering (EPS) motors, robotic actuators, and aerospace components.
Founded in 1999, Zhejiang Laysun Magnetics Ltd. is a national high-tech enterprise specializing in high-performance rare earth NdFeB permanent magnets.
Years of Industry Experience
Factory Area (sqm)
Expert Employees
Tons Annual Output Capacity
Headquartered in Hangzhou, Zhejiang, and supported by our state-of-the-art 100,000 m² manufacturing base in Suining, Sichuan, we supply high-performance rare earth permanent magnets to key industries worldwide. Our production process covers every step from vacuum induction melting and strip casting to hydrogen decrepitation, jet milling, sintering, precision machining, and advanced surface coating.
Our commitment to research and development helps us meet the strict requirements of sectors like automotive engineering, industrial automation, consumer electronics, and green energy technology.
We maintain rigorous testing protocols and certifications to ensure our products meet international standards.
Advanced Sintering Furnaces at Our Sichuan Manufacturing Base
Precision CNC Machining and Wire Cutting Workshop
Analyzing procurement expectations for modern magnetic systems in Europe, North America, and the Asia-Pacific region.
Global procurement teams must navigate complex environmental regulations, such as REACH, RoHS, and TSCA. Magnets used in electronics and automotive applications must be certified free of restricted hazardous substances.
Traceability of rare earth elements (neodymium, dysprosium, praseodymium, terbium) is increasingly required by OEMs. Knowing the origin of these elements helps buyers manage environmental risks and secure supply chains.
Industrial components are expected to operate reliably over long lifespans, often in harsh conditions. Procuring magnets with high-grade anti-corrosive coatings helps prevent early system failures and minimizes warranty claims.
Zhejiang Laysun Magnetics Ltd. integrates digital manufacturing and automation throughout our production facilities. Our factories utilize automated guided vehicles (AGVs), real-time monitoring networks, and robotic sorting systems to maintain consistent production quality and efficiency.
By centralizing raw material refining, mold making, sintering, machining, and surface coating processes, we streamline the production cycle. This integration reduces transportation delays, minimizes waste, and allows us to quickly adjust production to meet changing market demands.
Additionally, our proximity to major logistics hubs and port infrastructure ensures reliable export capabilities, helping global customers keep their assembly lines running smoothly.
How high-durability permanent magnets perform in various industrial environments.
EPS motors require precise, reliable magnetic torque. Magnets must withstand engine bay heat, moisture, and vibration. High-stability coatings like Ni-Cu-Ni or zinc-magnesium prevent degradation and maintain steering control.
Offshore wind turbines operate in highly corrosive marine air. Turbines use large magnetic assemblies that are difficult to replace. Our advanced epoxy and alloy coatings provide long-term protection, reducing maintenance costs.
Precision servo motors in robotic arms require compact, high-energy magnets. High-durability NdFeB magnets enable fast, precise movements in demanding factory environments without losing magnetic strength.
Matching the right NdFeB magnet grades and coatings to your specific industrial requirements.
Zhejiang Laysun Magnetics Ltd. manufactures a wide range of magnet grades, from high-remanence N52 to high-coercivity UH, EH, and AH grades. Coercivity grades are carefully formulated with dysprosium (Dy) and terbium (Tb) to ensure resistance to demagnetization at operating temperatures up to 220°C.
Selecting the appropriate coating is critical to ensuring the longevity of NdFeB magnets in various operating environments:
Answers to common questions about neodymium magnet corrosion resistance, coatings, and supply chain logistics.
Reliable magnetic assemblies and specialized tools engineered for industrial, retail, and consumer applications.
Laysun Magnetics