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Magnet Surface Treatments

Magnet coatings are essential for protecting them against corrosion, abrasion, moisture and chemicals. Check our overview of surface finishes to help you choose the right magnets. Also take a look at the BH curves of neodymium magnets and physical properties of magnets.

Surface treatment Interior Resistance
to abrasion
Water resistance Salt spray /
marine environment
Suitability
for bonding
Layer
thickness
Price
Nickel (Ni-Cu-Ni) ★★★ ★★ ★ ★ ★★★ 10–20 μm ★★
Black / coloured nickel ★★★ ★ ★ ★ ★★ 15–25 μm ★★
Zinc (Zn) ★★★ ★★ ★ ★ ★★★ 4–10 μm ★★
Gold (Ni-Cu-Ni-Au) ★★★ ★ ★ ★ ★★★ approx. 12 μm ★★★
Silver (Ni-Cu-Ni-Ag) ★★★ ★ ★ ★ ★★★ approx. 12 μm ★★★
Chrome (Ni-Cu-Ni-Cr) ★★★ ★ ★ ★ ★★★ approx. 15 μm ★★★
Copper (Ni-Cu) ★★★ ★ ★ ★ ★★★ approx. 10 μm ★★★
Phosphorescent layer ★★★ ★ ★ ★ ★★ approx. 100–300 μm ★★★
Passivation (phosphate) ★ ★ × × ★★★ 1–10 μm ★
PTFE (Teflon) ★★★ ★★★ ★★★ ★★★ ★ 12–25 μm ★★★
Epoxy ★★★ ★ ★★★ ★★★ ★★★ 10–25 μm ★★★
PP Plastic ★★★ ★★★ ★★★ ★★★ ★ 0.25–1 mm ★★★
ABS Plastic ★★★ ★★★ ★★★ ★★★ ★★ 0.25–1 mm ★★★
Rubber ★★★ ★★★ ★★★ ★★★ ★★ 0.5–1 mm ★★★
Everlube® 6155 ★★★ ★★★ ★★★ ★★★ ★ 8–25 μm ★★★
Uncoated ferrite magnets ★★★ ★★★ ★★★ ★★★ ★★★ 0 μm ★

Description of Magnet Surface Treatments

Nickel-plated magnet

Nickel (Ni-Cu-Ni)

The most common surface treatment for neodymium magnets, offering a good balance of price and durability for indoor use.

Black Nickel Plated Magnet

Black / coloured nickel (Ni-Cu-Ni)

A colour variant of the nickel surface finish with an attractive appearance, but lower top layer durability.

Galvanised Magnet

Zinc (Zn)

An affordable single-layer salt-spray resistant coating that creates an additional protective layer during corrosion.

Gilded Magnet

Gold (Ni-Cu-Ni-Au)

Decorative surface finish with a luxurious gold appearance, primarily suitable for magnets subject to less stress.

Silver-plated Magnet

Silver (Ni-Cu-Ni-Ag)

Decorative surface finish with a glossy silver appearance, designed for less stressed magnets.

Chrome-Plated Magnet

Chrome (Ni-Cu-Ni-Cr)

Chrome plating gives the magnet a shiny metallic appearance and reduces friction, which is why it is used, for example, in magnetic fasteners.

Copper-plated magnet

Copper (Ni-Cu)

The decorative copper layer gives the magnets their characteristic colour, but it may oxidise and change shade over time.

Phosphorescent Magnet

Phosphorescent layer

Special decorative finish that glows gently in the dark after exposure to light.

Passivated Magnet

Passivation (phosphate)

Phosphate coating provides only temporary protection and is used, for example, during production processes.

PTFE (Teflon) magnet

PTFE (Teflon)

Highly durable surface finish with high resistance to moisture and abrasion, suitable for outdoor use.

Epoxy Magnet

Epoxy

The epoxy layer provides good protection against water and corrosion in outdoor environments, provided it remains intact.

Laminated PP Magnet

PP Plastic

Plastic polypropylene (PP) casing in various colours is among the most durable finishes, ensuring very good protection against water, corrosion and scratching.

ABS Plastic Coated Magnet

ABS Plastic

Plastic housing in various colours made of acrylonitrile butadiene styrene (ABS) provides very good protection against water, corrosion and scratches, making it suitable for more demanding conditions.

Rubberised magnet

Rubber

The rubber layer protects the magnet from water, corrosion and mechanical damage, while simultaneously increasing friction on the surface.

Everlube magnet treatment

Everlube® 6155

Highly resistant protective layer with high hardness and resistance to corrosion, chemicals and salt spray.

Unfinished Ferrite Magnet

Unprocessed Ferrite Magnets

Ferrite magnets usually do not require a surface treatment and are naturally corrosion resistant.

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