Coatings & Corrosion
NdFeB coatings: nickel, zinc, epoxy, parylene
A practical overview of NdFeB coating options and when to specify each.
Last updated on 2026/01/22
Why coatings are required
NdFeB magnets are prone to corrosion in humid or chemically aggressive environments. Coatings are the default protection layer for most industrial use cases.
Common coating options
Nickel-copper-nickel (Ni-Cu-Ni)
- Most common option for general industrial use.
- Balanced corrosion protection and cost.
Zinc
- Suitable for cost-sensitive applications.
- Lower corrosion protection than nickel in harsh environments.
Epoxy
- Higher protection for moisture or mild chemicals.
- Often used when magnets are exposed to weather.
Parylene
- Thin, uniform coating for precision parts.
- Used when tight dimensional control is needed.
Selection checklist
- Environment: indoor vs outdoor, humidity, chemicals.
- Assembly: press-fit, bonded, or overmolded.
- Tolerance: check if coating thickness affects fit.
- Lead time: specialty coatings may extend lead time.
RFQ data to include
- Base grade and shape
- Coating preference and environment details
- Target tolerance and fit requirements
Ready for an RFQ?
Share your drawings, grades, coatings, and quantities. We will coordinate supplier feedback and confirm specs.
Related landing pages
Neodymium Magnets
Source neodymium magnets by shape, grade, coating and tolerance with supplier-confirmed lead times, compliance documents, and OEM RFQ support. Contact us today.
Custom Neodymium Magnets for OEM RFQ
Custom neodymium magnets sourcing for OEM teams with drawing review, grade and coating checks, RFQ-ready checklist, and supplier coordination. Start your quote.