Explore our highly-durable rare earth NdFeB permanent magnets equipped with state-of-the-art nickel coatings engineered to manage saturation magnetization losses.
In precision electro-mechanical applications, the magnetic contribution of the protection layer is often overlooked. As an OEM partner, Zhejiang Laysun Magnetics Ltd. brings rigorous engineering to this domain. Nickel is a ferromagnetic element with a distinct saturation magnetization ($M_s$) of approximately 0.6 Tesla (or ~55 emu/g) at room temperature.
When rare earth Neodymium-Iron-Boron (NdFeB) magnets are electroplated with multi-layer Nickel (such as Ni-Cu-Ni or Ni-Au), this ferromagnetic coating influences the flux path. Depending on the design, it can either serve as a slight shunting path or lead to eddy current losses at high operational frequencies.
Our advanced plating facility optimizes the crystalline structure and thickness parameters (typically 10-25 μm) of the electrodeposited nickel layer. This ensures the protection of the core permanent magnet without compromising high-frequency response in Voice Coil Motors (VCM) and Automotive EPS units.
Understanding the impact of diverse plating techniques on saturation magnetization, structural integrity, and environmental endurance.
| Coating Type | Saturation Magnetization ($M_s$) | Thickness Range (μm) | Salt Spray Test (SST) | Primary Industrial Applications |
|---|---|---|---|---|
| Ni-Cu-Ni (Standard) | Moderate (~0.6 T per Ni layer) | 15 - 25 | 24 - 72 Hours | Electric Motors, General Sensors, Consumer Devices |
| Double Nickel (OEM Specialty) | Optimized Low Magnetic Reluctance | 12 - 20 | 48 - 96 Hours | Voice Coil Motors (VCM), Precision Haptics |
| Black/Grey Epoxy | Non-magnetic (0 T) | 15 - 30 | 72 - 240 Hours | Automotive Sensors, Severe Environments |
| Zinc (Zn) Plating | Non-magnetic (0 T) | 5 - 12 | 8 - 24 Hours | Cost-sensitive Consumer Electronics |
| Ni-Cu-Ni + Gold (Au) | Controlled Saturation Limit | 15 - 25 | 48 - 96 Hours | Medical Devices, Semiconductor Cleanroom Tooling |
Leveraging global capacity, cutting-edge technology, and decades of industrial experience since 1999.
How Laysun Magnetics customizes nickel-plated permanent magnets to prevent magnetic leakage and maximize energy conversion efficiency across complex fields.
High-stability NdFeB rotor segments optimized to withstand thermal demagnetization. Controlled nickel layer properties prevent parasitic eddy-current generation.
Heavy-duty multi-pole ring magnets engineered with precise magnetic orientations to drive automated assembly lines and robotic joints with minimal downtime.
Ultra-thin magnetic rings (like MagSafe solutions) and micro-disc NdFeB magnets that integrate seamlessly into smartphones, laptops, and haptic engines.
Founded at the turn of the millennium in 1999, Zhejiang Laysun Magnetics Ltd. has evolved from a local visionary startup to a global pacesetter in permanent magnet production. Our core facilities are strategically distributed to maintain stability, flexibility, and supply chain strength.
With a massive factory spanning 100,000 square meters in Suining, Sichuan, and a commercial headquarters in Hangzhou, Zhejiang, we leverage regional raw material access and direct logistical channels. Our commitment remains rooted in four foundational pillars: Quality, Credibility, Technology, and Innovation.
Delivering consistent rare earth permanent magnets amid complex international standards and tight trade dynamics.
Modern manufacturing requires predictable material streams. Because Neodymium (Nd), Dysprosium (Dy), and Terbium (Tb) are prone to price volatility and logistical disruptions, Laysun Magnetics maintains long-term strategic agreements with major upstream rare earth mines in China.
Our annual manufacturing threshold of 5000 tons allows us to scale raw material acquisition, ensuring price stability and volume commitment for our long-term contract partners across Europe, North America, and Southeast Asia.
With global strictness regarding chemical disposal and environmental impact, our Sichuan plating facilities utilize state-of-the-art closed-loop water treatment. We satisfy strict ecological criteria while providing high-grade nickel solutions that comply with RoHS 3.0 and REACH requirements.
Headquartered in Hangzhou, China, Laysun Magnetics is expanding its global footprints with regional sales, distribution hubs, and testing offices to serve our key engineering accounts immediately.
We maintain strict industrial compliance. Our production systems have earned credentials spanning multiple high-stakes sectors:
Continuous evolution in magnetic physics, advanced material coating formulas, and extreme-performance engineering.
Implementing GBD technologies to selectively introduce Dysprosium (Dy) and Terbium (Tb) along the magnet grain boundary phase. This dramatically increases intrinsic coercivity ($H_{cj}$) while minimizing the use of scarce heavy rare earths.
Transitioning our production lines toward next-generation electroless nickel systems. These systems provide uniform layer profiles on complex-shaped block magnets, eliminating edge build-up and preserving precise air gaps.
Aiming for carbon-neutral processing at our Sichuan plants by integration of renewable energy sources and continuous digitization of magnetizing, testing, and sorting processes.
Technical guidance for design engineers and purchasing managers procuring high-grade NdFeB systems.
Browse our advanced ring, block, and segment magnets designed for critical automotive, electronic, and industrial devices.
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