FAQ - Frequently Asked Questions
Which magnet coatings are there?
Table of Contents:
Neodymium magnets (super magnets): Coating necessaryNeodymium reacts to oxygen and oxidises quickly if untreated. That's why all neodymium magnets in our shop are covered with a protective coating, which is so thin that it doesn't have any impact on the adhesive force of the magnet.
We use the following coatings on our neodymium magnets:
- By far the most frequently used coating
- Colour: shiny metallic
- Good price/performance ratio
- Thickness: approx. 12 micro metres
- Razor-thin coating (24k) over normal Ni-Cu-Ni coat, but with the same features
- Colour: shiny metallic
- Thickness of gold-coating without Ni-Cu-Ni: 0,05 micro metre
- Thickness of whole coating: approx. 12 micro metres
- Better resistance against rubbing and pressure (that's why we use this coating for our sphere magnets)
- Colour: dull, grey-metallic
- Thickness: approx. 15 micro metres
- Colour: shiny brown-red-gold. The colour may change over time (darkening, spots)!
- Slightly weaker rubbing and impact resistance than Ni-Cu-Ni
- Slightly weaker corrosion resistance than als Ni-Cu-Ni
- Thickness: approx. 10 micro metres
The copper-coloured surface rubs off with frequent use (similar to gold-coated magnets) and is therefore suitable for decorative purposes only.
Epoxy resin (Ni-Cu-Ni-Epoxy)(in exceptional cases also just epoxy)
- Colour: black
- almost 100% non-corrosive, as long as coating is intact
- not shock-resistant (crumbles quickly)
- Thickness: approx. 10 micrometre
Pot magnetsIf not noted otherwise, we use neodymium magnets with a Ni-Cu-Ni coating for our pot magnets. The term "coating" in the article description of pot magnets refers to the steel pot around the magnet. In most cases it is nickel (Ni); for the pot magnets that are painted white it is nickel with additional powder coating.
Special coatingsThere is a variety of other coatings for neodymium magnets that we do not offer in our standard assortment.
- naked magnet material, black/grey
- Magnets oxidise and corrode quickly when they come in contact with oxygen and water
- Magnets need to be covered air- and watertight quickly
- matt grey/blueish
- only zinc without Ni-Cu-Ni
- more susceptible to corrosion than Ni-Cu-Ni
- can leave black marks
- approx. 4 micrometres thick
- shiny silver
- razor-thin coating over normal Ni-Cu-Ni-coating, hence the same attributes
- difference purely visual
- Material: Sterling Silver
- approx. 12 micrometres thick
- only teflon without Ni-Cu-Ni
- 100% waterproof
- very rub-resistant
- 12-25 micrometres thick
Ferrite magnets: No coating
In theory, you could put various coats on ferrite magnets, but that is technically complex and expensive. The price for the coating would be greater than the price for the whole magnet.
Since ferrite magnets are weather-resistant even without protection, an additional coating is not necessary. Our ferrite magnets are therefore uncoated.