Causes and solutions of bearing corrosion

Bearing corrosion is very common, it will reduce the service life of the bearing. So we must pay attention to this problem in our daily work.
High temperature bearing corrosion causes and preventive methods to determine, first of all, to see what caused by high temperature bearing corrosion, generally divided into external and internal causes. To sum up, they are as follows
1. Metal surface finish (oxygen concentration difference, battery corrosion).
2. Chemical composition and structure of metal materials.
3. Solution composition and pH value in contact with metal surface.
4. Ambient temperature and humidity.
5. Various environmental media in contact with metal surface.
6. In addition, human sweat is also the cause of bearing corrosion, its pH value is 5 ~ 6. Therefore, in order to prevent corrosion caused by hand perspiration, the installation and production personnel should wear gloves and do not touch the high temperature bearing with hands.
Apply antirust oil to prevent high temperature bearing from rusting
1. Immersion method: some small high temperature bearings are immersed in antirust grease, and the thickness of oil film can be achieved by controlling the temperature or viscosity of antirust grease. A method for adhering a layer of antirust grease on the surface of the coating.
2. Brushing method: when brushing, pay attention to apply evenly on the surface of high-temperature bearing to avoid accumulation and leakage.
3. spray method: some large antirust substances are not suitable to be oiled with immersion method. Generally, the filtered compressed air of about 0.7Mpa pressure is used for spraying in the clean air area. Spray method is suitable for solvent dilution antirust oil or thin layer antirust oil. This method must adopt perfect fire prevention and labor protection measures.
When the bearing rotates under the load, the raceway surface or rolling surface of the inner and outer ring presents fish scale peeling phenomenon due to rolling fatigue.
The reasons of bearing peeling damage are as follows
1. Excessive load
2. Poor installation (non-linear), torque load, foreign body invasion and water inflow.
3. Poor lubrication, improper lubricant and improper bearing clearance.
4. The accuracy of the bearing box is not good, the rigidity of the bearing box is uneven, and the deflection of the shaft is large
5. Development caused by rust, erosion point, scratch and indentation (surface deformation phenomenon).
What measures should be taken to solve the bearing peeling damage
1. Check the size of the load and re study the bearing used
2. Improve the installation method, improve the sealing device, stop rust.
3. Use proper viscosity lubricant and improve lubrication method.
4. Check the accuracy of the shaft and bearing housing
5. Check the clearance.