How do we protect these magnets from corrosion or oxidation, as they are prone to rusting in some environments?

Protecting NdFeB Magnets from corrosion or oxidation is essential to ensure their longevity and maintain their magnetic properties. Magnets, especially those made from materials like neodymium or samarium cobalt, are prone to rusting in certain environments. Here are several methods to protect magnets from corrosion:
Coating:
Apply a protective coating on the magnet's surface. Common coatings include nickel, zinc, or epoxy. Nickel plating, for example, creates a barrier that helps prevent direct exposure to air and moisture.
Galvanization:
Galvanizing involves applying a layer of zinc to the magnet's surface. Zinc acts as a sacrificial anode, corroding preferentially to protect the underlying magnet material.
Epoxy Resin Coating:
Submerge the magnet in epoxy resin to create a protective barrier against moisture and air. Epoxy resin is a durable and transparent material that adheres well to the magnet's surface.
Phosphating:
Phosphating is a chemical process that involves applying a phosphate coating to the magnet. This coating provides corrosion resistance and improves the adhesion of subsequent coatings.
Gold or Silver Plating:
Gold or silver plating provides a decorative and protective layer. While these metals are not as corrosion-resistant as nickel or zinc, they can be effective in certain environments.
Ceramic Coating:
Apply a ceramic coating to the magnet, which can provide resistance to both corrosion and wear. This type of coating can be effective in harsh environments.
Stainless Steel Encapsulation:
Encapsulate the magnet in a stainless steel housing or casing. Stainless steel is corrosion-resistant and can provide effective protection in challenging conditions.
Use in a Controlled Environment:
Limit the exposure of the magnets to harsh environmental conditions by using them in controlled environments whenever possible. Avoid exposing them to high humidity, corrosive chemicals, or extreme temperatures.
Regular Cleaning and Inspection:
Periodically clean the magnets to remove any accumulated dirt or contaminants that may contribute to corrosion. Regularly inspect the magnets for signs of corrosion and address any issues promptly.
Climate Control:
Maintain a stable and controlled climate in the storage or operating environment. Avoid extreme temperature fluctuations and high humidity levels, as these can accelerate corrosion.
Protective Sealing:
Seal the magnet in a protective casing or encapsulate it using a sealing material. This method helps prevent direct contact with environmental elements.
Keep Dry:
Store magnets in dry conditions to minimize the risk of corrosion. If magnets get wet, ensure they are thoroughly dried to prevent water-induced corrosion.
When choosing a protective method, consider the specific application, environmental conditions, and the level of protection required. The choice of protection depends on factors such as the magnet material, the operating environment, and the desired level of durability.