Metal material chemical reaction with its environment or electro-chemical reaction arising from the change of consumption known as corrosion.
Metal surface corrosion is a common phenomenon, the view of light impact sound, seriously affect the performance of the product and even life. The diversity of forms of metal corrosion, but the nature of the metal and the surrounding medium to chemical corrosion and electrochemical corrosion can be divided into two categories.
Chemical corrosion is due to the metal caused by pure chemical interactions between it and the surrounding medium. No current during corrosion, corrosive substances. This corrosive substances are generally formed on the metal surface covered in a loose film. Corrosion mechanism of reaction formation is relatively simple, mainly through contact between object a chemical reaction is occurring, such as gold and the chemical reactions in the atmosphere and water forming corrosion (also known as rust).
Electrochemical corrosion is generated due to electrochemical effect between the metal and the surrounding medium. Electrochemical corrosion characteristics of corrosion as well as current is generated. Effect of corrosion mechanism of electrochemical reactions are mainly micro-batteries.
When the thrust bearing is used, if a loud sound, description is the sliding friction between metal sound. At this time, bearing no harmful effects, and will not affect its work. But when you make this sound, we where to check for the sound to stop it? First, the thrust bearing radial clearance larger easily when voices when there is in the event of a rapid speed may also be vulnerable. Second is prone in winter, and often appear without rules.
1. mixed with sand or carbon particles and other impurities in the bearing. Acid stain or paint,
2. mixed with water in the bearings. To corrode;
3. single direction thrust bearing clearance is too small (with select is inappropriate)
4. the lubricating oil or grease varieties selected wrong; oil or grease leakage through seal).
5. lack of lubrication (oil level is too low. Or bore distortion is not straight).
6. single direction thrust bearing bore of clamp flat (bad bore roundness).
7. the bearing surface of the pad at the end of inequality (leading to even crack the housing bore deformation) dust particles.
8. the bearing block hole of a debris (residual chips).
9. seal eccentricity (hit neighboring parts and friction).
Thrust bearings produces corrosion on the surface of the part. In accordance with the extent of corrosion damage is corrosion spots or corrosion pits (cave), spotted pit corrosion and general distribution is sporadic or intensive, irregular shape, depth and uncertain, color is light gray, Brown, beige, black, etc.



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