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17 May

How to Choose the Magnet Coating?

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Magnet Coating

 

As we know, the neodymium iron boron magnets contain 64-66% iron, so it is prone to be corroded and oxidized if coatings are not adopted. Both appearance and magnetic properties of uncoated high-performance neodymium magnets would be affected under high temperature, acid condition, alkaline environment, seawater, etc. All in all, the coating is necessary for magnets.

 

There are several kinds of coatings offered on magnets. The ideal coating for your application will be determined by several factors such as environment, temperature level, resilience, and also government needs such as FDA-approved coatings. Below is a listing of the different coatings and their features to assist you to navigate via the labyrinth of selections.

 

● Black Nickel

 

3 layers, nickel-copper-nickel, plus an extra process to get the black nickel coating.

Security of the magnet from deterioration in ambient air.

Not a safety coating from humidity, water, or saltwater.

Light security of the magnet from breaking.

A decorative surface.

Shiny metal black/gray surface.

Density: 12-25 um.

Price: Low.

Max working Temp: Roughly 200o C.

Gluing nickel coated magnets onto steel or plastic must be finished with adhesive or epoxies specifically designed for magnets.

Key Industries: motors, clinical devices (outside of the body), sensing units, auto, holding, generators, pumps, slim movie deposition. Made use of in nearly all industries.

 

● Gold

 

FDA accepted clinical coating for in-body usage.

Has an undercoating of Ni-Cu-Ni.

Defense of the magnet from deterioration in ambient air.

Small defense from humidity, water, or deep sea. The thickness of the gold is extremely thin, so efficiency in salt spray examinations will ultimately show the failing of the coating. Making the coating thicker will certainly assist, but gold is intended to be slim.

Gold coating.

The thickness of the gold layer:1- 1um.

Price: High.

Max working Temp: Around 200o C.

Melting Point: 1,000.

Main Industries: clinical (in and out of body applications), precious jewelry, decorative usages.

 

● Nickel

 

The most usual coating on magnets

Really 3 layers, nickel-copper-nickel

Security of the magnet from deterioration in ambient air

Not a safety coating from humidity, water, or saltwater

Light security of the magnet from chipping

A decorative surface

Shiny metallic gray finish

Density: 15-25

Price: Low

Max functioning Temperature: Around 200o C.

Gluing nickel-coated magnets onto steel or plastic needs to be done with glue or epoxies particularly designed for magnets.

Key Industries: motors, medical devices (beyond the body), sensing units, automotive, holding, generators, pumps, thin movie deposition. Used in nearly all markets.

 

● Arylene

 

FDA accepted medical coating for in-body usage.

Security of the magnet from corrosion in ambient air.

Slight security from moisture, water, or deep sea. Parylene will gradually stop working in the deep sea, so undercoating may be needed.

Transparent coating.

The density of the gold layer: 1-70 um.

Price: Amount Dependent. Carried out in batches, so the higher the amount, the reduced the expense/ computer.

Max functioning Temp: Around 120-305o C.

Key Industries: medical (in body applications), and also any kind of product that needs a slim coating.

 

● Zinc

 

Excellent bond when glued onto the steel with an adhesive or epoxy specifically rated for magnets.

Defense of the magnet from corrosion in ambient air.

Small security from moisture, water, or saltwater, yet not considered a good option if the magnet remains in wetness or liquids.

The thickness of the coating is thin, so less air gap between the magnet as well as the steel.

White-blue, Black.

Density: 4-10.

Price: Low.

Max functioning Temp: Approximately 120o C.

Main Industries: any kind of application where reduced temp, reduced coating price, as well as little safety obstacle is required.Zinc.

 

Good attachment when glued onto the steel with glue or epoxy is particularly ranked for magnets.

Protection of the magnet from deterioration in ambient air.

Small security from humidity, water, or saltwater, however, ruled out a great option if the magnet remains in moisture or liquids.

The density of the coating is slim, so less air space between the magnet and also the steel.

White-blue, Black.

Density: 4-10 um.

Price: Low.

Max functioning Temperature: Around 120o C.

Key Industries: any type of application where reduced temp, reduced coating price, and also little safety barrier is called for.

 

● Epoxy

 

Epoxy coating is outstanding as a barrier for salt air and the deep sea.

Can scratch easily, should be managed meticulously during setting up.

Great attachment to steel with magnet-rated adhesive.

Generally tinted in black, nonetheless, can be tinted in white.

Density: 15-30 um.

Price: Medium.

Max working Temperature: About 200o C.

Gluing nickel coated magnets onto steel or plastic should be finished with glue or epoxies particularly created for magnets.

Main Industries: Marine, motor, sensing units, customer items, vehicle.

 

AH MAGNET is an IATF16949, ISO9001, ISO14001, and ISO45001 accredited manufacturer of all kinds of high-performance neodymium magnets and magnetic assemblies with over 30 years of experience in the field. We provide custom magnet coatings, please feel free to contact us if you need them.

Shangping Liu

Joined on 17, May 2022  

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