Discussion on the causes and solutions of bearing corrosion

Bearing corrosion is very common and it reduces the life of the bearing. Therefore, everyone must pay attention to this problem in their daily work. The reason for the corrosion of high-temperature bearings and the determination of preventive methods, first of all depends on what is caused by high-temperature bearing corrosion, generally divided into external and internal factors. In summary, there are mainly: 

1. Metal surface finish (oxygen concentration difference battery corrosion). 

2. The chemical composition and structure of the metal material itself. 

3. Solution composition and pH value in contact with the metal surface. 

4. Ambient temperature and humidity. 

5. Various environmental media in contact with the metal surface. 

6. Other people's sweat is also the cause of bearing corrosion, its pH is 5-6. 

Therefore, in order to prevent rust caused by hand sweat, the installation and production personnel should wear gloves, do not touch the high temperature bearing by hand. Apply anti-rust oil to prevent high-temperature bearing rust: 

1. Soaking method: Some small high-temperature bearings are immersed in anti-rust grease, and the thickness of the oil film can be achieved by controlling the temperature or viscosity of the anti-rust grease. A method of attaching a layer of rust preventive grease to the surface. 

2. Brushing method: Pay attention to evenly apply to the surface of high temperature bearing when brushing, do not cause accumulation, and also pay attention to prevent leakage coating. 

3. Spray method: Some large-scale anti-rust materials are not suitable for oiling by immersion method. Generally, the compressed air with a pressure of about 0.7Mpa is sprayed in an air cleaning place. The spray method is suitable for solvent-diluted rust preventive oil or thin layer rust preventive oil. This method must be based on sound fire protection and labor protection measures. When the bearing is subjected to load rotation, the raceway surface or the rolling surface of the inner and outer rings exhibits a fish scale-like peeling phenomenon due to rolling fatigue. Reasons for the peeling damage of the bearing: 

1. Excessive load

 2. Poor installation (non-linear), moment load, foreign matter intrusion, water ingress. 

3, poor lubrication, lubricant is not suitable for bearing clearance is not appropriate. 

4, the bearing box accuracy is not good, the rigidity of the bearing box's rigid uneven shaft is large, 

5, rust, erosion points, scratches and indentations (surface deformation phenomenon) caused by the development. 

What measures are taken to solve the bearing peeling damage: 

1. Check the size of the load and the bearing used again. 

2. Improve the installation method, improve the sealing device, and prevent rust during shutdown. 

3. Use a lubricant of appropriate viscosity to improve the lubrication method. 

4. Check the accuracy of the shaft and bearing housing.

5. Check the clearance.