Samarium Cobalt magnets exhibit good corrosion resistance when compared to Neodymium magnets. For most applications, a coating or plating is not required, but it should be considered when operating in environments that are acidic, have high moisture, or are in a vacuum.
Coatings and metal platings can be applied to increase the ability to clean the magnet. A metal plating will allow for greater cleanliness for vacuum and medical applications. Nickel plating can be applied to facilitate soldering the magnet, which is often used for adhesion to a printed circuit board.
Low environmental reactivity makes Samarium Cobalt (SmCo) magnets good candidates for Medical and Aerospace applications. It is always advisable to empirically evaluate the magnet alloy in the operational environment before deciding on a design path. Typically, Samarium Cobalt magnets used in Medical applications will be parylene coating in addition to being clad in an application appropriate material.