Waterproof neodymium magnets

Neodymium magnets are the strongest permanent magnets about their attractive force and dimensions, as well as having high coercivity and remanence. Unlike the ferrite magnet, which has a strength 10 times lower than the neodymium magnet, the neodymium magnet is not resistant to moisture, however, a coating can be installed on the neodymium magnet to make it waterproof, without having a lower attractive force. However, this magnet has a low corrosion resistance, so they are mostly used with a coating. This rubber or plastic coating offers a high resistance to water, so they can be used in external and humid spaces where there is the presence of a temperature between -30 and 80ºC. 

Several sectors using waterproof neodymium magnets coated with nickel, plastic or with a PVC sheath, allows the magnet to be resistant to corrosion and oxidation. We can also opt for rubber casings, unlike the artificial coating, the natural ones have several microscopic holes, causing a worsening of performance.

The application of the coating to neodymium magnets brings us several advantages such as, for example, protection from external factors, it's application in underwater and humid places, protection from scratches or scuffs, and the possibility to customize the coating.

Depending on the applications to which we are going to destine it, we find 4 types of coating as: 

- Magnet with threaded sleeve

- Magnet with threaded sleeve coating

- Magnet with inner thread coating

- Magnet with rubber coating with countersunk hole

Where can we use neodymium waterproof magnets?

Waterproof magnets can be used in metal walls, bars and offices. In addition to bathrooms, refrigerators and aquariums. Water magnets can be used for temperature control and controls inside aquariums. As well as for decoration as a support for corals and reef rocks. 

Water magnets can be found in water pumps like the ones found in automobiles, this favors the cooling of the engine. 

From the point of view of aquarium maintenance, we need the use of magnets, one on the outside and one on the inside as we can see in the following image.