Magnet Coatings

Bonded Neo (MQ1™) magnets are generally coated prior to being delivered to a magnet user. Typically, MQ1™ magnets are coated via an Electrophoresis Coating or Spray Coating method. However, other coatings and coating methods are available if your magnet requires a particular characteristic or operates in a particularly high temperature or corrosive environment.

The following table summarizes a few of the options available along with key attributes of each.

Should you have any questions about which coating is right for your application, please contact us.

Coating type Details Salt Spray
Test Results
(35°C*5%NaCI)
PCT Test Results
(120°C*95RH%*2atm)
Description
Electrophoresis Coating
("E-coating")
~20µm ~100hrs ~10hrs E-coating is the most common coating for MQ1™ magnets; it provides uniform coating thickness and is suitable for many applications
Spray coating ~10µm ~30hrs ** Spray coating is a common coating method for MQ1™ magnets; it is better suited for smaller magnets which are not exposed to corrosive environments
Parylene coating ~10µm ~50hrs ~170hrs Parylene can be used in applications which experience corrosive environments, such as water; Parylene coating performs especially well in Salt Spray and PCT Tests
~30µm ~250hrs ~250hrs
Dipping ~5µm ~10hrs ** Dipping is not a commonly used coating for MQ1™ magnets; the coating is relatively thin, rendering its corrosion protection characteristics rather poor
Nickel Plating
("Ni-Plating")
~20µm ~30hrs ~120hrs While nickel coating is widely used for fully dense sintered magnets, it is not a very common coating for MQ1™ magnets, as the adhesion between the magnet and the nickel plating is not optimal. It is used only in certain applications

** Test not performed for these coatings due to poor results