Zinc coatings provide good adhesion, you can keep an eye on the magnets in the motor, many are galvanized coatings, which are used to protect the magnets from corrosion in the surrounding air and provide mild moisture, water or salt water protection. However, if the magnet is in a humid environment, it is not a suitable choice. It has a thickness of 4-10 um and a maximum operating temperature of about 120°C. Zinc coatings are mainly used for low temperature applications and where a little protective barrier is needed.
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