Metal surface corrosion is a common phenomenon exists, the light effect sound concept, seriously affect the product's performance and even affecting life. There are various forms of metal corrosion, but the effect on the metal and the nature of the surrounding medium to points can be divided into two types of chemical and electrochemical corrosion.
    Chemical etching of the metal and the surrounding medium is a pure chemical action between the cause. Chemical etching process is not current generation, but there are corrosive substances produced. Such corrosive substances are generally formed on the metal surface covered by a layer of loose film. Corrosion mechanism of chemical reactions is relatively simple, mainly produced by contact between objects of chemical reactions, such as gold, with water in the atmosphere formed by the reaction of chemical corrosion (also known as rust).
    Is due to electrochemical corrosion between the metal and the surrounding medium caused by electrochemical action. The basic characteristics of electrochemical corrosion of corrosion at the same time there are current. Corrosion mechanism of electrochemical reaction is mainly micro-cell effect.
    When the bearing is in use, if a lot of noise, it indicates that the sliding friction between the metal sound. In this case, the bearing is without any harmful effects, but it will not affect the normal operation. But when the issue of the sound, we have to check where we can make the sound stop it? First, the needle bearing radial clearance is large, it is easy to produce sound, there is an emergency in the event of speed may also be prone to. Followed in the winter prone, and often appear no rules.
   1 bearing carbon mixed with sand or other impurities. Acids such as dirt or paint,
   2 bearing mixed with water. Play a corrosive effect;
   3. The bearing clearance is too small (with the selected inappropriately)
   4 varieties of oil or grease choose the wrong; oil or grease through the seal leakage).
   5 lack of lubrication (oil level is too low, or distorted the housing bore is not straight).
   6 The Swedish bearings were flat seat hole clip (bore roundness is not good).
   7 bearing bottom horn uneven (deformed or even cause bearing seat hole cracks) and dust particles.
   8 bearing hole with debris (residual chips).
   9 ring eccentric (and adjacent parts encounter friction).
   Needle bearing parts in each surface will cause corrosion. According to the extent of corrosion damage corrosion spots or corrosion pits (holes), spots and pits generally showed scattered or dense, irregular shape, depth uncertain, color light gray, red-brown, taupe, black and so on.



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