Which Coatings Magnets are Available?
There are many types of coatings available and each one has their own unique properties and uses for different applications.
Nickel (Ni-Cu-Ni)
Epoxy
Teflon (PTFE)
Zinc (Zn)
Black Nickel (Ni)
Titanium Nitrate (TiN)
Gold (Au)
Copper (Cu)
Which Coatings Magnets are Available
Nickel-Copper-Nickel (Ni-Cu-Ni) Coated Magnets
Ni-Cu-Ni is by far the most common and popular coating for neodymium magnets. This is because it’s cost effective and excellent at preventing corrosion from ambient air. They have a reflective silver appearance which gives them an elegant and high-quality appearance. Although Ni-Cu-Ni offers excellent resistance to corrosion, they are not recommended for outdoor use because prolonged exposure can penetrate the pores and corrode the magnet.
Thickness: 10-25um
Cost: Low
Max Operating Temperature: Est 200°C
Industries: Ni-Cu-Ni coated neodymium magnets are used in all industries, such as manufacturing, engineering, domestic, commercial, generators, automotive, oil and gas, air conditioning, education & research, construction, transport, mining, agriculture and green energy.
✔️ Pros: Excellent corrosion against ambient air (general atmosphere)
❌ Cons: Not ideal for use in outdoor, wet, salty or acidic environments.
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Epoxy Coated Magnets
Epoxy coated magnets offer one of the most superior coating methods. The epoxy coating can withstand an impressive 72 hours in salt spray tests which means they are perfect for harsh, wet and salty conditions. They also have a lot of advantages over other metal coatings as they provide excellent electrical insulation. Epoxy magnets cost slightly more than traditional Ni-Cu-Ni magnets but offer a superior level of protection.
Thickness: 15-25um
Cost: Medium
Max Operating Temperature: Est 200°C
Industries: Epoxy coated neodymium magnets are used in many industries, such as marine, manufacturing, engineering, consumer products, commercial, sensors and jewellery.
✔️ Pros: Excellent protection against humid, wet and salty environments
❌ Cons: Can crack under significant impacts
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Teflon (PTFE) Coated Magnets
Teflon is a very durable synthetic resin that provides a smooth finish. PTFE has excellent resistance to many acids, chemicals and solvents which makes it an ideal option if the magnets may come into contact with them. Additionally, Teflon coatings help reduce friction and wear on surfaces, making them last longer in abrasive conditions. Lastly, the durability of this coating mustn’t be understated – they are the supreme coating option for harsh conditions.
Thickness: 1.5-3um
Cost: High
Max Operating Temperature: Est 250°C
Industries: Teflon (PTFE) coated neodymium magnets are used in many industries, such as marine, medical, manufacturing, engineering, oil and gas.
✔️ Pros: Offers the best protection against all elements; humidity, wet, salty and acidic environments / Superior protection against breakage
❌ Cons: Can slip due to smooth surface, mechanical hold may be required.
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Zinc (Zn) Coated Magnets
When zinc is exposed to ambient air, it oxidises which provides a stronger protective barrier. Although it isn’t the best coating against corrosive environments, it is one of the most cost effective coatings available
Thickness: 8-15um
Cost: Low
Max Operating Temperature: Est 120°C
Industries: Zinc coated neodymium magnets are used in projects that require low cost solutions such as DIY, consumer goods and education.
✔️ Pros: Low Cost
❌ Cons: Corrodes if exposed to wet and humid environments over a prolonged period
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Black Nickel (Ni) Coated Magnets
Black nickel is very similar to Ni-Cu-Ni as it offers great resistance to ambient air and light resistance to chipping/breaking on impact. Black nickel maintains electrical conductivity with low reflectivity making it perfect for use in discreet and hidden applications. Additionally, black nickel coatings can provide a barrier against friction and heat, helping surfaces to last longer.
Thickness: 12-30um
Cost: Medium
Max Operating Temperature: Est 200°C
Industries: Black nickel coated neodymium magnets are used in industries such as manufacturing, automotive, pumps, hydraulics and jewellery.
✔️ Pros: Aesthetic / Low Reflectivity / Same protection properties as the most common coating Ni-Cu-Ni
❌ Cons: Increase cost / Increased lead times
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Titanium Nitrate (TiN) Coated Magnets
Titanium Nitrate (TiN) is a very durable coating that protects the magnet from harsh environments, chemicals and acids. This is a non-toxic material that is safe for the environment and holds a gold / yellow colour.
Thickness: 2-6um
Cost: Medium
Max Operating Temperature: Est 500°C
Industries: Medical, research, engineering
✔️ Pros: Extremely durable / Environmentally friendly / Offers protection against most hazardous environments
❌ Cons: Can increase lead times of custom-ordered magnets.
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Gold (Au) Coated Magnets
Gold coating has an under coating of Ni-Cu-Ni and provides slight resistance from humidity and moisture. Gold plated magnets have a thin layer of gold which offers excellent oxidation resistance. This coating does not provide sufficient protection for wet, harsh or abrasive environments.
Thickness: 20-25um
Cost: High
Max Operating Temperature: Est 1,000°C
Industries: Medical, jewellery, research, decorative.
✔️ Pros: Premium aesthetic / The element (Au) has been approved for in-body and outer-body medical use
❌ Cons: Expensive coating method / Does not offer adequate protection in abrasive environments
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Copper (Cu) Coated Magnets
Copper coated magnets have an undercoating of nickel (Ni) are primarily used for decorative purposes rather than performance. This is because the material can rub off over time which means it is not ideal for harsh conditions.
Thickness: 10-20um
Cost: Low
Max Operating Temperature: Est 200°C
Industries: Jewellery and decorative.
✔️ Pros: A unique aesthetic that’s primarily used for decoration and jewellery
❌ Cons: Not suitable for harsh, wet environments or toxic.
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