Magnet Surface Treatment & Coating Service
Comprehensive surface coating solutions for sintered NdFeB magnets — from standard Ni-Cu-Ni to specialized Parylene, gold, and PTFE coatings for demanding corrosion, biocompatibility, and high-temperature environments.
Protect Your Magnets in Any Environment
Sintered NdFeB magnets are highly susceptible to corrosion due to their high iron content and porous structure. Without proper surface treatment, they can oxidize and lose magnetic properties rapidly. We provide a full spectrum of coating technologies, available for our production magnets or your customer-supplied parts.
Coating Performance Comparison
| Coating Type | NSS Rating | Thickness | Cost | Best For |
|---|---|---|---|---|
| Ni-Cu-Ni | 200 hrs | 10-25μm | $ | General purpose, indoor electronics |
| Zinc + Chromate | 200 hrs | 8-15μm | $$ | Cost-sensitive automotive applications |
| Epoxy Resin | 200 hrs | 15-30μm | $ | Chemical resistance, non-conductive |
| Tin (Sn) | 100 hrs | 5-12μm | $ | Soldering applications |
| Black Nickel | 200 hrs | 10-20μm | $$ | Low reflectance, aesthetic requirements |
| Gold (Au) | 500 hrs | 2-5μm | $$$ | High-end electronics, contact points |
| Silver (Ag) | 400 hrs | 3-8μm | $$$ | RF shielding, electrical conductivity |
| Parylene (CVD) | 1000 hrs | 2-25μm | $$$$ | Medical implants, extreme moisture |
Our Surface Treatment Process
2. Pre-treatment (Degreasing)
3. Surface Activation
4. Coating Application
5. Post-treatment (Sealing)
6. Adhesion Testing
7. Salt Spray Testing
8. CMM Re-check
9. Certification
10. Delivery
Advanced & Specialized Solutions
Parylene C/D/N
Applied via Chemical Vapor Deposition (CVD), Parylene provides a truly conformal, pinhole-free barrier. Ideal for medical devices, implantable magnets, and PCB-level magnetic components.
Biocompatible Gold
Electroplated gold over nickel provides excellent corrosion resistance and is widely used for contacts and medical applications where biocompatibility is required.
PTFE (Teflon) Coatings
Offering superior non-stick properties and chemical inertness, PTFE-coated magnets are commonly used in pharmaceutical and food processing equipment.
Coating Applications
Medical Implants
Parylene and Gold coatings for surgical instruments and implantable magnetic devices.
Marine & Offshore
High-spec coatings (1000hr NSS) for underwater sensors and marine equipment.
Automotive Underhood
Heat-resistant epoxy and zinc coatings for sensors and actuators in harsh environments.
Electronics Assembly
Solderable Tin or Gold coatings for direct PCB mounting and electrical contacts.
The Elite Coating Advantage
In-House Lines
Direct control over plating quality and batch consistency.
Quick Turnaround
3–5 days for most standard coating services.
Full Documentation
Detailed reports for salt spray, thickness, and adhesion tests.
Customer-Supplied Welcome
We provide coating services for magnets you’ve already sourced.
Frequently Asked Questions
Can you coat magnets that I supply?
Yes. We offer contract coating services for customer-supplied magnets. We will perform a surface analysis to ensure the material is suitable for the requested coating.
What coating is recommended for underwater/marine use?
For long-term marine exposure, we typically recommend a multi-layer Epoxy or Parylene coating. These provide the highest protection against moisture and salt ingress.
What thickness of Ni is standard?
A standard Ni-Cu-Ni coating is typically 12–20 micrometers thick. We can adjust this based on your specific tolerance and environmental requirements.
Is Parylene biocompatible for body-contact applications?
Yes, Parylene C is USP Class VI certified and widely used in medical implants for its biocompatibility and chemical inertness.
How do I specify a coating on my drawing?
You should specify the coating type (e.g., Ni-Cu-Ni), the minimum thickness (e.g., min 12μm), and any required testing (e.g., 200hr NSS per ASTM B117).
Request a Surface Treatment Quote
Optimize your magnet’s lifespan with the right coating. Get a quote in 24 hours.