How to Protect Bearings From Corrosion

In the case of bearings, corrosion is often undetectable and a deadly enemy. Stainless steel and chromed steel bearings are designed to resist corrosion, but are especially vulnerable when stored improperly in harsh environments where moisture and condensation can cause corrosion. Minimum exposure to chemicals, dust and other contaminants can increase the risk of corrosion and significantly shorten the life of the bearings.

When the rust is visible, it is too late to store the bearing. Prolonged exposure to severe molten water causes black gray stripes, cracks, slices and premature bearing defects. The actual costs of preventing oxidation are measured by downtime due to machine failure and costly replacement of mechanical parts, so prevention should always be the first line of defense. This section details the four most successful ways to protect bearings against corrosion.

Better material

To improve the corrosion resistance of standard steel bearings, choose a design that uses stainless steel balls. These bearings typically use standard grade 400 stainless steel with adequate corrosion resistance and moderate corrosion resistance. 300 degree stainless steel bearings can be used for better durability. However, the load capacity is reduced. Hybrid bearings with ceramic balls and stainless steel lace are the best option to prevent effective oxidation. The ceramics are chemically inert and, therefore, resistant to corrosion. It is known that hybrid bearings of the correct type work faster, operate at higher temperatures and reduce vibrations.

Protective coating

By applying a protective coating to the bearing, you can create a barrier that prevents contaminants from reaching the surface of the bearing. In some cases, the inner and outer rings are covered with a protective layer. The most common types are chromium and nickel plating, thermal zinc spraying and black oxide. An additional benefit of the protective coatings is that the bearings tighten the track surface and extend the life of the bearing.

Tighter  seals

For bearings used in corrosive environments, tighter  and stronger seals made of high quality materials are often an effective way to prevent oxidation. Specially designed seals that can prevent water, fine dust and chemicals from penetrating the bearings are often the first choice for corrosion.

Grease

In environments where the machine is constantly exposed to humidity or moisture, it is safe to use grease or waterproof lubricants to prevent oxidation. The grease acts as a protective coating, creating a barrier between the bearing surface and all possible contaminants. However, it is important not to use too much fat. This is because it can cause problems in itself.