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Rust and Corrosion

Rust and Corrosion

Condition
  • Rusting or corrosion of bearing ring and rolling element surfaces
  • Sometimes rusted at spacing equal to the distances between the rolling elements
Cause
  • Ingress of water or corrosive material (such as acid)
  • Condensation of moisture contained in the air.
  • Poor packaging and storing conditions, and handling with bare hands.
Solution
  1. Improvement in sealing effect
  2. Periodic inspection of lubricating oil
  3. Careful handling of bearing
  4. Measures for preventing rusting when not operating for a long period of time.

Photo: Inner ring of tapered roller bearing

  • Inner ring of tapered roller bearing
  • Rusting on raceway surface spacing equivalent to the distance between rollers. The cause is water in lubricant.

Photo: Outer ring of tapered roller bearing

  • Outer ring of tapered roller bearing
  • Rusting on raceway surface spacing equivalent to the distances between rollers. The cause is water in lubricant. Some points are corroded.

Photo: Roller of spherical roller bearing

  • Roller of spherical roller bearing
  • Rust as well as corrosion on rolling contact surface
  • Ingress of water

Photo: Inner ring (split type) of self-aligning roller bearing

  • Inner ring (split type) of self-aligning roller bearing
  • Rust and corrosion of the raceway surface
  • The cause is ingress of water.