Bearing corrosion is determined by a variety of intrinsic and extrinsic factors that caused summarized in: 

     1, the metal surface finish (oxygen concentration differential cell corrosion).

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

     3, the solution in contact with the metal surface composition and pH.

     4, the ambient temperature and humidity. 

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

     6, another person′s sweat also lead bearing corrosion NSK reason, it had a pH of 5-6. Therefore, in order to prevent corrosion caused by hand sweat, installation and production personnel should wear gloves, it should not touch the imported bearings.