How to prevent permanent magnets rusting

A lot of magnets react to moisture and start rusting. If a magnet is corroded by rust, it loses much of its attractiveness. Corrosion is your enemy, as it forces you to spend more money in substitution of magnets, which would have to live much longer. Today we will show you how to make your magnets more functional.

Why does magnet rust?

Magnets work because they are ferrous (ferrous = relating to, or containing, iron). Magnets will be drawn to iron and iron rusts to oxygen and water. Rust reduces a magnet’s attraction and often makes it unfit for you after a short while. A magnet Rust might turn into a paperweight for ten years in a year. Corrosion varies depending upon the iron densities.

Some magnets are ferromagnetic, utilizing nickel, cobalt, dysprosium, and a range of other elements, but neither is entirely corrosion-resistant. Like iron, their attractiveness is reduced by corrosion. Neodymium magnets are the most powerful permanent magnet in damp environments with high iron levels and are highly susceptible to corrosion. It contains traces of other rare earth elements as well, such as dysprosium, which are sometimes added to a neodymium magnet to enhance corrosion resistance. Neodymium magnets are usually covered before use, however. We use a triple nickel-copper-nickel layer sometimes, but that’s not the only alternative. Other recommendations for coating are:

  • Gold.
  • Silver.
  • Zinc.
  • Tin.
  • Epoxy.
  • PTFE.


Even without a protective coating, samarium cobalt magnets are more resistant to corrosion. A great deal of iron is substituted by cobalt, which does not react to water, from neodymium magnets. Most SmCo magnets are still shielded, although this is mostly cosmetic or functional (adhesive or sterile) for implementation purposes. Samarium cobalt magnets are commonly used in coastal or underwater applications when subjected to very corrosive saltwater air continuously.

Lower magnetic performance but improved corrosion resistance.

Alnico and ceramic magnets both naturally resist corrosion, although they fail to deliver the same magnetic efficiency as cobalt and neodymium magnets from rare earth. There are specific grades of Alnico magnets that contain traces of iron, and therefore, if exposed to water, some light surface corrosion over time will be shown. And the presence of these substances also makes it corrosion resistant:

  • Oil.
  • Alcohol.
  • Solvents.

Ceramic magnets are constructed of iron oxide, which can never corrode, except underwater. Ceramic magnets are very rarely coated due to their unrivaled resistance to corrosion. Surface processing is usually necessary as ceramic magnets are often dusty on the surface. You will always need to change these magnets long before you use rare earth magnets in wet environments. The best way to resist corrosion is to switch to a more significant attraction with another material or not. If you are looking for a magnets company to replace your magnet or provide your assistance with custom neodymium magnets, then we can provide you with a smooth and cheap alternative, helping you preserve the lifespan of your attractions as much as possible.

About MyitSolutions

Myitsolutions a valued contributor on Vents Magazine a Google news approved site. I love to provide the latest news to my viewers and sharing knowledge about interesting facts on different topics.

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