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Magnet Plating and Coating Options

The following is a list and description of common plating options for custom magnets.Why do magnets need to be plated?

Oxidization (Rust)

NdFeB magnets will oxidize(rust) if left exposed. When a plating wears down or cracks, the exposed area will oxidize. An oxidized area will not result in complete degradation of the magnet, only the oxidized area will lose its strength. However the magnet will lose some structural integrity and become more susceptible to breakage.


Depending on shape, permanent magnet substrate is brittle. A multilayered metal plating like nickel or zinc improves the magnets resistance to chipping and wear, particularly around corners.

Harsh Environments

Platings vary in their tolerance of different harsh chemicals and abrasion. Salt and humidity in regions near the ocean are commonly overlooked when selecting a plating. Be sure to consider the magnets environment when selecting a plating.

Every plating or coating have their own advantages and disadvantages . For example, epoxy or resin coating are good at corrosion-proof but they are easier to drop comparing with NiCuNi coating . The most common type of plating for neodymium magnets Nickel (Ni-Cu-Ni) intended for indoor use. It has proven to be very resilient when subjected to normal wear and tear. However it will corrode outdoors in prolonged exposure to salt water, salty air, or harsh chemicals.

U-POLEMAG Corrosion-proof Coating Solution (Over 500Hrs on SST)

"High density polymer resin coating" is new solution for protecting neodymium magnets which are easy to be oxidized from the rust. It resist over 500 hours on salty spray testing (SST), and we can supply different colors as your request. It's not only a good solution for the rust proof, also passed the allergy patch test by Japanese medical company, used in their medical solutions and also such as medical accessories which will always touch to the human skins

The Characteristics of High Density Polymar Resin Coating (MF305)

Industrial standard, good work stability, sufficient protection against corrosion in dry ambients, possible allergic reaction on sensible persons