Product Overview & Application Scenarios
Ideal for both industry professionals and DIY enthusiasts, these Zn-coated ring magnets provide a strong, reliable magnetic hold paired with the convenience of screw-mounted installation. Their robust design makes them a popular choice across construction and manufacturing sectors, where they are used to secure metal components, create reinforced anchor points, and mount fixtures that require both firm attachment and easy removal.
Beyond industrial use, these Zn-coated ring magnets excel in everyday applications as well-perfect for building customized magnetic storage systems, securing garden gates, or safely mounting heavy household items like mirrors. Their versatility also makes them valuable in retail, offices, and commercial spaces, where they effortlessly stabilize signage, displays, and promotional materials.
Technical Specifications
|
Product Name |
zn coating ring magnets |
|
Magnet Grade |
N48 (Br ≥13.7 kGs, Hcj ≥12 kOe) |
|
Dimension |
12mm x 2mm x (2.5mm hole) |
|
Dimensional Tolerance |
+/-0.05 |
|
Operating Temperature |
≤80°C (High-temp versions available) |
|
Density |
≥7.5 g/cm³ |
|
Surface Magnetic Field |
3,000 Gs |
|
Magnetic Flux |
2.0 mWb (Fluxmeter-tested) |
Manufacturing Process
Melt-Spinning Process
The melt-spinning process uses praseodymium–neodymium alloy as the primary raw material, combined with precisely proportioned additions of iron, copper, dysprosium–iron alloy, and other elements. These materials are melted together in a vacuum furnace at high temperature. Once fully molten, the alloy melt is forced under pressure onto the surface of a rapidly rotating chill wheel, where it solidifies almost instantaneously at an ultra-high cooling rate of approximately 100,000°C per second. This rapid solidification produces ribbon-cast NdFeB alloy ingots with a fine and uniform microstructure, which serve as the basis for subsequent processing.
Hydrogen Decrepitation (HD)
After melting and casting, the NdFeB alloy ingots are transferred into a controlled hydrogen atmosphere. Hydrogen is gradually absorbed into the solid alloy, causing lattice expansion and embrittlement of the material. As a result, the alloy readily fractures into fine particles during subsequent milling. This process, which utilizes hydrogen-induced embrittlement to convert bulk alloy into powder, is known as hydrogen decrepitation
Reliability Testing
Salt Spray Corrosion Assessment
To validate coating durability, each batch undergoes salt spray exposure that replicates:
Coastal or marine environments
Industrial pollution and corrosive atmospheres
High-moisture or chemical-rich conditions
This accelerated test verifies long-term resistance against corrosion and coating deterioration.
High Temperature & Humidity Endurance
Magnets are evaluated in chambers operating at 85°C and 85% relative humidity for 96–500 hours. Post-test assessments include:
Coating adhesion
Dimensional stability
Magnetic performance retention
Visual and structural integrity
These tests ensure the magnets remain dependable even in harsh working environments
Packaging & Transportation
◆ Final Quality Approval
Before packaging, every magnet undergoes a final quality approval process using precision measurement, automated inspection systems, and manual verification. Only products that fully meet specifications are released for shipment.
◆ Magnetization & Configuration
Magnets are uniformly magnetized and systematically arranged to ensure magnetic stability, reduce stray fields during transportation, and support efficient automated assembly at the customer's facility.
◆ Protective Packaging
Multi-layer protective solutions, including vacuum sealing, moisture barriers, and controlled desiccation or inert gas protection, are applied to prevent corrosion throughout storage and transit.
◆ Secure Outer Packing
Customized outer packaging-such as reinforced cartons, rigid cases, and magnetic shielding-provides enhanced protection against impact and leakage. Each shipment is clearly labeled with batch traceability and complete documentation in compliance with international logistics standards.
Why Choose Us
Dongguan Jinconn New Material Holdings Co., Ltd. is a publicly listed enterprise focusing on the R&D, production, and worldwide supply of rare-earth magnetic materials. From our base in Dongguan's Xiaomen Industrial Zone, we support clients across numerous high-tech industries.
Key Advantages
More than Two Decades of Expertise
Years of industrial experience guarantee stable production and refined technological capabilities.
Strict Quality Management & Custom Engineering
We provide tailored solutions backed by a comprehensive quality control system covering every stage of fabrication.
FAQ
Q1. How does partial demagnetization occur in real applications?
A: Partial demagnetization typically occurs when the magnet is exposed to reverse magnetic fields, elevated temperatures, or mechanical stress beyond its intrinsic coercivity (Hcj). In motors, this often happens during overload, short-circuit events, or improper magnetic circuit design.
Q2. What is the practical difference between Hcj and working coercivity?
A: Hcj is a material property measured under ideal conditions, while working coercivity reflects real operating conditions including temperature, demagnetizing fields, and geometry. Design safety margins must be based on working coercivity, not nominal Hcj.
Q3. Does higher Br always improve system performance?
A: No. Once the magnetic circuit reaches saturation, further increases in Br provide little benefit and may increase cost or demagnetization risk. System-level optimization is more important than maximizing Br alone.
Contact Us
Phone / WhatsApp / WeChat: +86 13829120676
Email: Info@jinconn.com
Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province, China
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