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Neodymium Magnets (NdFeB) By Coating

Neodymium magnets are also known as Neodymium-Iron-Boron or Nd-Fe-B or NIB super magnets since they are composed of these elements. The chemical composition is Nd2Fe14B. These magnets are extremely strong for their small size and are metallic in appearance.
Attributes Of Neodymium Magnets
-There are several attributes of Neodymium magnets that differentiate them from other magnets.
-Neodymium magnets are very strong permanent magnets. In fact they are the strongest of all rare earth magnets and also the strongest permanent magnets that exist today.
-Neodymium magnets have a very high resistance to demagnetization. This makes them very useful in many different kinds of industrial applications.
-Even small sized Neodymium magnets have a very high energy. This makes them easily portable from one place to another.
-They are good in ambient temperature.
-Another major attribute of Neodymium magnets that has added to their popularity is the affordability factor. Neodymium magnets, unlike previous high strength magnets like tiny cobalt-samarium magnets, are priced very low and can be afforded by educators and experimenters on their limited budgets.
-Neodymium magnets are very corrosive and hence have to be handled carefully. It is best to coat them for long-term maximum energy output and usage.
-Neodymium magnets have a low working temperature for heat applications and can catch fire at high temperatures.

Neodymium Magnet Coatings:
Titanium (Ti)
Tin (Sn)
Silver (Ag)
Gold (Au)
Zinc (Zn)
Epoxy
Nickel (Ni)
Nickel-Copper-Nickel (Ni-Cu-Ni)
Titanium Nitride (TiN)
Parylene C
Everlube
Chrome
PTFE (also known as “Teflon”; white, black, gray, silvery)
Ni-Cu-Ni plus Epoxy
Ni-Cu-Ni plus Rubber
Zn plus Rubber
Ni-Cu-Ni plus Parylene C
Ni-Cu-Ni plus PTFE
Tin (Sn) plus Parylene C
Zinc Chromate
Phosphate Passivation

Sintered Neodymium Magnet By General Coating / Palting

Nickel-Copper-Nickel (Ni-Cu-Ni)

Most common coating on magnets
Actually 3 layers, nickel-copper-nickel
Protection of the magnet from corrosion in ambient air
Not a protective coating from humidity, water, or salt water
Light protection of the magnet from chipping
A decorative finish
Shiny metallic gray finish
Thickness: 12-25 microns
Cost: Low
Max working Temp: Approximately 200^o C
Gluing nickel coated magnets onto steel or plastic should be done with glue or epoxies specifically designed for magnets.
Main Industries: motors, medical devices (outside of body), sensors, automotive, holding, generators, pumps, thin film deposition. Used in almost all industries

Zinc (Zn)

Good adhesion when glued onto steel with a glue or epoxy specifically rated for magnets
Protection of the magnet from corrosion in ambient air
Slight protection from humidity, water, or salt water, but not consider a good choice if magnet is in moisture or fluids
Thickness of coating is thin, so less air gap between magnet and steel
Dull gray finish
Thickness: 4-8 micron
Cost: Low
Max working Temp: Approximately 120^o C
Main Industries: any application where low temp, low coating cost and little protective barrier is required.

Black Epoxy (EP)

Gray Epoxy (EP)

Epoxy coating is excellent as a barrier for salt air and salt water
Can scratch easily, must be handled carefully during assembly
Very good adhesion to steel with magnet rated glue
Mainly colored in black, however, can be colored in white
Thickness: 15-30 microns
Cost: Medium
Max working Temp: Approximately 200^o C
Gluing nickel coated magnets onto steel or plastic should be done with glue or epoxies specifically designed for magnets.
Main Industries: Marine, motor, sensors, consumer products, automotive

Color Zinc (Cr+Zn)

Good adhesion when glued onto steel with a glue or epoxy specifically rated for magnets
Protection of the magnet from corrosion in ambient air
Slight protection from humidity, water, or salt water, but not consider a good choice if magnet is in moisture or fluids
Thickness of coating is thin, so less air gap between magnet and steel
Dull gray finish
Thickness: 4-8 micron
Cost: Low
Max working Temp: Approximately 120^o C
Main Industries: any application where low temp, low coating cost and little protective barrier is required.

Gold (Au)

FDA approved medical coating for in-body use
Has an undercoating of Ni-Cu-Ni
Protection of the magnet from corrosion in ambient air
Slight protection from humidity, water, or salt water. The thickness of the gold is very thin, so performance in salt spray tests will ultimately show failure of the coating. Making the coating thicker will help, but gold is intended to be thin.
Gold finish
Thickness of gold layer: 0.3-0.6 micron
Cost: High
Max working Temp: Approximately 200^o C
Main Industries: medical (in and out of body applications), jewelry, decorative uses.

Copper (Cu)

Mostly used as a decorative coating
Protection of the magnet from corrosion in ambient air, but is less then nickel
Can rub off over time
Not a protective coating from humidity, water, or salt water
Copper finish
Thickness: 8-10 microns
Cost: Medium
Max working Temp: Approximately 200^o C
Main Industries: Decorative

Chrome (Cr)

Mostly used as a decorative coating
Protection of the magnet from corrosion in ambient air, but is less then nickel
Not a protective coating from humidity, water, or salt water
Chrome finish, dull metallic gray color
Thickness: 12-15 microns
Cost: Low – Medium
Max working Temp: Approximately 200^o C
Main Industries: Jewelry, decorative, cosmetic, consumer products

PTFE (Teflon)

Requires molds and tooling
Excellent protection to magnet against breakage, impact, and corrosion
Available on magnets that are medium to larger in size. Small magnets cannot be molded, but can be sprayed (see Spray PTFE – Teflon)
Provides a protective coating from humidity, fluids and AutoClave
Color of PTFE is white
Thickness: 0.5-1 mm
Cost: molds & tooling are required, and cost is dependent upon complexity of each. Cost / pc will decrease quickly with large quantities
Max working Temp: Approximately 250^o C
Gluing PTFE magnets onto steel or plastic has very poor adhesion. A mechanical hold is recommended
Main Industries: Predominantly medical and food industries.

Phosphate Passivation

Approved as a Food-grade coating
Requires tooling
Excellent protection to magnet against corrosion
Unlike molded PTFE, smaller magnets can be sprayed as well as larger magnets
Provides a protective coating from humidity and fluids
Can scratch, so proper handling is required
Color can be white or black
Thickness: 0.1 – 0.5 mm
Cost: Medium
Max working Temp: Approximately 200^o C
Gluing PTFE magnets onto steel or plastic has very poor adhesion. A mechanical hold is recommended
Main Industries: Predominantly medical and food industries.

Parylene

FDA approved medical coating for in-body use
Protection of the magnet from corrosion in ambient air
Slight protection from humidity, water, or salt water. Parylene will slowly fail in salt water, so an undercoating may be required.
Transparent finish
Thickness: 3-7 micron
Cost: Quantity Dependent. Done in batches, so the higher the quantity, the lower the cost / pc.
Max working Temp: Approximately 150^o C
Main Industries: medical (in body applications), and any product that needs a thin coating

Titanium (Ti-Tin)

FDA approved medical coating for in-body use
Hard coating that has a very strong bond to the magnet
Resilient to most chemicals and environmentally friendly
Protection from humidity and fluids
Finished color is a metallic gold with a smooth surface
Thickness of: 2-3 microns
Cost: Medium
Max working Temp: Approximately 500^o C
Main Industries: Medical

Silver (Ag)

Mostly used as a decorative coating
Protection of the magnet from corrosion in ambient air, but is less then nickel
Soft metal, so can scratch easily
Silver finish
Thickness: 12-15 microns
Cost: Low – Medium
Max working Temp: Approximately 200^o C
Main Industries: Jewelry, decorative, cosmetic, consumer products

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