Engineered to prevent degradation in high-corrosive, extreme-temperature, and ultra-high-vacuum environments. Review our primary OEM collection.
Why NdFeB magnets demand state-of-the-art coating engineering.
| Coating Type | Common Thickness (μm) | Salt Spray Test (SST) Resistance | Max Operating Temp (°C) | Primary Industrial Applications |
|---|---|---|---|---|
| Nickel-Copper-Nickel (Ni-Cu-Ni) | 15 - 25 | 48 - 96 Hours | ≤ 220°C | General Industrial Motors, Electronics, Sensors, Hook Magnets |
| Black/Grey Epoxy | 15 - 30 | 240 - 500 Hours | ≤ 150°C | Marine Environments, Under-hood EV Components, Robotics |
| Zinc (Zn) - Cr3+ Passivated | 5 - 12 | 24 - 48 Hours | ≤ 180°C | Cost-effective Consumer Electronics, Internal Structural Mounts |
| Gold / Silver (Au / Ag) | 0.05 - 1 (Over Ni-Cu) | 48 - 72 Hours | ≤ 200°C | Medical Devices, Precision Instrumentation, Sensor Relays |
| Everlube / Teflon | 10 - 25 | 120 - 240 Hours | ≤ 250°C | Aerospace Actuators, High Friction Mechanical Assemblies |
| Rubber Coated (TPE/TPU) | 500 - 1500 (Encapsulated) | Waterproof (IP68 Equivalent) | ≤ 80°C | Automotive Roof Racks, Delicate Surface Mounts, Marine Sourcing |
| Parylene C | 1 - 5 | > 240 Hours | ≤ 100°C | Precision Biomedical Implants, Micro-Actuators, Space Systems |
Deeply integrated metallurgy and chemical electroplating capability under one roof.
For global OEMs, sourcing raw magnets from one manufacturer and shipping them to third-party electroplating facilities introduces critical process anomalies. Improper handling during shipping triggers micro-oxidation. Fluctuations in moisture degrade surface adhesion, causing peeling coats under severe operation.
The Laysun Magnetics Integrated Solution: Our factory in Suining, Sichuan covers 100,000 square meters, handling everything from raw rare earth hydrogen decrepitation and vacuum sintering to high-precision wire-cutting, finishing, and advanced chemical deposition. We control the complete process chain to ensure defect-free coating adhesion.
A premier national high-tech enterprise transforming rare earth engineering since 1999.
Guided by quality, credibility, technology, and innovation, our facilities utilize advanced laser particle size analyzers, scanning electron microscopes (SEM), and specialized magnetic testing instrumentation to confirm coating uniformity and structural integrity.
Our research and development team specializes in grain boundary diffusion (GBD) technologies and heavy rare earth reduction methods (Dy, Tb). This allows us to achieve higher magnetic properties at reduced overall materials cost, optimizing both price and performance.
Our products meet API 6D, API 607, CE, ISO 9001, ISO 14001, ISO 18001, and TS specifications. This guarantees compliance with global environmental regulations, including REACH and RoHS directives.
Rigorous quality control processes and compliance certificates.
ISO Quality Management Certificate
CE Compliance Certification
ISO 14001 Environmental System Certificate
Engineered options tailored for diverse industries.
Customized surface properties designed for target operational environments.
Joint motor applications require dynamic acceleration rates. We use thin-film chemical nickel plating (Ni-Cu-Ni) and high-adhesion grey epoxy to withstand rapid rotational forces while protecting against humidity.
UAV propulsion demands lightweight, highly consistent magnetic flux profiles. Our micro-thickness passivated coatings limit weight while preventing corrosion from atmospheric condensation.
Under-hood environments experience temperature cycles and exposure to road chemicals. Our advanced GBD magnets with dual-layered epoxy-nickel-epoxy encapsulation resist chemical attack while maintaining performance up to 220°C.
Brushless DC motors in power tools experience high vibration and impacts. Impact-resistant polymer coatings prevent chipping, maintaining rotor performance under rugged mechanical stress.
Mobile applications require aesthetic uniformity, skin-safe chemistry, and biocompatible barriers. We offer high-quality NdFeB ring magnets with custom PVD plating to prevent irritation and maintain aesthetic standards.
Appliance compressor systems operate in hermetically sealed environments. We provide customized zinc and epoxy-coated NdFeB blocks designed to withstand continuous exposure to refrigerants and lubricants.
Headquartered in the high-tech hub of Hangzhou, Zhejiang Province, China, Zhejiang Laysun Magnetics Ltd. manages global subsidiaries and distribution networks. This infrastructure supports just-in-time delivery to assembly plants in North America, the European Union, and Southeast Asia.
Our raw materials are sourced from regulated mining operations in Southern and Western China. This secure, vertically integrated supply chain insulates our clients from pricing volatility and material shortages.
Explore our specialized assemblies, including Ni-Cu-Ni electroplated blocks and rubber-encapsulated pot magnets.
Technical and procurement inquiries regarding rare earth magnet coatings.
NdFeB magnets contain a high concentration of iron (approximately 65%) and highly active Neodymium. When exposed to ambient moisture, oxygen, or industrial acids, they oxidize quickly, causing structural degradation. Surface treatments act as a physical barrier to block oxygen and moisture, preventing oxidation.
We use multi-stage ultrasonic degreasing, acid pickling, and activation cycles prior to plating. Our automated electroplating systems continuously monitor bath chemistry, pH, current density, and temperature. We verify adhesion using cross-hatch testing, thermal shock, and salt spray exposure.
Pricing is primarily driven by: (1) Raw material index costs (PrNd, DyFe metal pricing); (2) Magnet volume, shape complexity, and size tolerances; (3) Chosen coating type and required thickness (e.g., epoxy requires thermal curing, while gold requires precious metal deposition); and (4) Total order volume, which determines efficiency and batch processing savings.
Yes. We design and manufacture custom rubber-coated (TPE/TPU) and plastic-molded (ABS/Nylon) magnets. These assemblies provide waterproofing (IP68) and prevent damage to delicate contact surfaces, making them ideal for automotive roof racks, marine applications, and outdoor signage.
For standard coatings (Ni-Cu-Ni, Epoxy, Zinc), sample production takes 7 to 10 working days. For specialized coatings (Parylene, custom formulations, or multi-layered combinations), tooling and sampling requires 15 to 20 working days, depending on geometry and tolerance specifications.
Partner with Zhejiang Laysun Magnetics Ltd. Our engineering team will assist in matching magnet materials, coating types, and tolerances to your design environment.
Send us your detailed specifications, tolerances, and target operating environments. We will provide a technical analysis and formal pricing quote within 24 hours.
Send us your requirements and our team will get in touch shortly.
Laysun Magnetics
