0574-27862218
0574-27861683
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Ningbo Yunsheng offers full coating options (Ni, Cu-Ni, Zn, Zn-Ni, Au, Ag, Sn, phosphating, electrophoresis, epoxy, Everlube, vacuum aluminum plating and composite coatings etc.) to fit any customer application scenario.
As an industry leader, we developed national standards for NdFeB surface protection (“Sintered NdFeB Surface Plating/Coating”), filling regulatory gaps in this field.
Painting Process
Electroplating Process
Phosphating Film
Phosphating Film
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Phosphating treatment for NdFeB magnet is a common surface protection technique. It provides moderate corrosion resistance, excellent adhesion, and low cost—often used as pre-treatment for process corrosion protection or painting (to enhance coating-magnet bonding). Single-phosphated magnet is typically applied in fields like variable-frequency air conditioners.
Electrophoretic Black Epoxy
Electrophoretic Black Epoxy
10~30
96 hours or more
A black epoxy resin coating with high corrosion resistance, acid/alkali resistance, excellent adhesion, insulation, coverage, uniformity, and cost-effective environmental performance. Its wear resistance is relatively low, making it suitable for moderately harsh industrial environments. Widely used in applications like motors and offshore wind power.
Sprayed Black Epoxy (water-based paint/oil-based paint)
Sprayed Black Epoxy (water-based paint/oil-based paint)
10~30
48 hours or more / 96 hours or more
This epoxy resin coating is applied to magnet via spraying (cured on the surface). Key Traits
>1.High corrosion/acid/alkali resistance, strong adhesion, insulation, full coverage, uniformity, eco-friendliness & cost-effectiveness
> 2.Note: Moderate wear resistance
>3.Uses: Motors, automotive industry (moderately harsh industrial environments)
Sprayed Clear Epoxy
Sprayed Clear Epoxy
4~12
24 hours or more
Made from clear epoxy resin paint, this process applies a smooth, transparent epoxy coating to magnet. It offers high salt/acid/alkali resistance and strong adhesion.
Everlube
Everlube
10~30
48 hours or more
Everlube is an imported epoxy coating. It uses a high volume of aluminum powder as pigment—initially silver-gray, but cures (via baking) to a finish ranging from silver-gray to golden yellow. It offers high corrosion resistance, strong adhesion, and an attractive appearance.
PVD Vacuum Aluminum Coating
PVD Vacuum Aluminum Coating
2~10
24 hours or more
Thin coating, excellent uniformity, low magnetic shielding, strong adhesion, and minimal environmental impact. Note: Coating has low wear resistance. Ideal for high-precision products.
Barrel-Plated Ni-Cu-Ni
Barrel-Plated Ni-Cu-Ni
7~25
48 hours or more
A high-performance composite protective system: Combines copper layer’s high density, smoothness & low magnetism with nickel layer’s corrosion resistance, wear resistance & aesthetics.
Core benefits:
?Strong corrosion resistance + adhesion
?Bright, smooth finish
?Good wear resistance & toughness
?Balances appearance, protection, magnetism & cost for NdFeB magnets
Uses: Indoor, daily-use & light industrial environments (handles humidity, temperature fluctuations & mild corrosion).
Rack-Plated Ni-Cu-Ni
Rack-Plated Ni-Cu-Ni
10~35
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A high-performance composite protective system: Combines copper layer’s high density, smoothness & low magnetism with nickel layer’s corrosion resistance, wear resistance & aesthetics.
Core benefits:
?Strong corrosion resistance + adhesion
?Bright, smooth finish
?Good wear resistance & toughness
?Balances appearance, protection, magnetism & cost for NdFeB magnets
Uses: Indoor, daily-use & light industrial environments (handles humidity, temperature fluctuations & mild corrosion).
Triple-Nickel Coating
Triple-Nickel Coating
7~20
48 hours or more
This coating features a three-layer electroplated nickel structure—its core performance comes from the carefully designed electrochemical potential difference between layers. Core benefits:
?Good corrosion resistance + strong adhesion
?Excellent appearance & wear resistance
?High surface cleanliness after cleaning
Uses: Widely used in the VCM (Voice Coil Motor) magnet field.
Cu-Ni + Ni-P Alloy/Chemical Nickel
Cu-Ni + Ni-P Alloy/Chemical Nickel
4~15
48 hours or more
A high-performance composite coating: Uses a low-magnetic-shielding copper-nickel base layer, topped with a Ni-P alloy layer. It combines the advantages of electroplating and electroless plating, with these core features:
?Thin coating + minimal magnetic loss
?Good wear resistance + excellent corrosion resistance
?Note: Higher cost due to specialized processing
Uses: Widely used in the consumer electronics 3C sector.
Zinc Plating
Zinc Plating
4~12
48 hours or more
The zinc coating protects the NdFeB substrate as a sacrificial anode, with these core features:
?Strong adhesion, high corrosion resistance, smooth surface
?Low magnetic loss, cost-effective
?After trivalent chromium passivation, it shows silver-white finishes (e.g., blue-white zinc, colored zinc) with decorative effects
Note: Not suitable for high temperature/humidity, severe corrosion, frequent friction, or mechanical vibration environments.
Uses: Widely used in acoustic speakers and small industrial motors.
Zinc + Zinc-Nickel Coating
Zinc + Zinc-Nickel Coating
4~10
48 hours or more
This coating uses a zinc base layer topped with a zinc-nickel alloy layer. It combines the zinc layer’s strengths (strong adhesion, low magnetic loss) with enhanced high corrosion resistance. Uses: Widely used in the consumer electronics 3C sector.
We’re committed to building an eco-friendly enterprise, with an industry-leading water treatment plant. Managed via real-time environmental bureau online monitoring, our process uses source-separated management, multi-stage membrane recovery, and low-temperature evaporation technology—enabling efficient, low-energy, and environmentally friendly treatment of production wastewater.
