Reasons for rusting magnets
Environmental humidity: Magnets, especially neodymium iron boron magnets, are prone to corrosion in humid environments due to their high proportion of iron element (64-68%)
Water molecules react chemically with iron in magnets, leading to the formation of iron oxide or rust
.
Poor air circulation: If the magnet is stored in a place with poor air circulation, moisture and heat cannot be effectively dissipated, which will increase the condensation of moisture on the surface of the magnet and accelerate the rusting process
.
Temperature difference variation: Storing magnets in environments with large temperature differences can cause surface condensation and increase the risk of rust
.
Incomplete cleaning before electroplating: If the surface dirt of the magnet is not thoroughly cleaned before electroplating, the dirt may affect the adhesion of the plating layer, leading to premature detachment of the plating layer and exposing the magnet substrate to a corrosive environment
.
Electroplating process issues: Insufficient electroplating time or problems with the process flow may result in uneven or insufficient thickness of the plating layer, which cannot effectively isolate the magnet from contact with air and moisture, thereby accelerating rusting
.
Packaging seal damage: If the packaging seal of the magnet is damaged, the magnet will be directly exposed to the external environment and easily come into contact with oxygen and moisture in the air, causing oxidation reactions
.
Chemical corrosion: Pollutants in the air, such as chemicals, oils, etc., may form a thin film on the surface of magnets, promoting the formation of rust spots
.
Mechanical damage: Magnets are very brittle, and if not handled properly or subjected to excessive force, they are prone to breakage or fracture, and the damaged area can easily become the starting point of rust
.
To prevent magnets from rusting, the following measures can be taken:
Surface coating protection: Apply a layer of protective paint or coating to the surface of the magnet to isolate it from contact with oxygen and moisture in the air
.
Coating treatment: Coating the surface of the magnet with a layer of non rusting metal, such as chromium, nickel, etc., can have a good anti rust effect
.
Oil seal method: Using oil seal technology, a layer of oil film is coated on the surface of the magnet to isolate oxygen and moisture in the air, achieving the purpose of rust prevention
.
Rust inhibitor: Applying a layer of rust inhibitor on the surface of the magnet can form a protective film to prevent the magnet from rusting
.
Improving storage environment: Keeping magnets dry and avoiding humid environments can effectively prevent magnets from rusting
.
Through the above measures, the service life of magnets can be effectively extended and their rust prevention performance can be improved
.