How corrosion affects rolling bearings

Although stainless steel and chromium steel bearings have corrosion resistance characteristics, they cannot avoid rusting. Improper storage and handling, high humidity, condensation, etc. can significantly shorten the service life of rolling bearings. In many cases, you will not discover a problem until the damage has been completed. So how does corrosion affect rolling bearings?

If the rolling bearing is exposed to water for a long time, it can cause deep rust. Over time, peeling and cracks can form, leading to premature bearing fatigue. Alternatively, fretting corrosion can occur if the bearing fits loosely or is improperly installed. Over time, the rings may not be uniformly supported, which can have a negative impact on load distribution. From a larger perspective, corrosion can reduce machine performance and productivity, and increase operating costs. What characteristics should we look for if we want to know whether rolling bearings are corroded? What can we do?

Generally, deep-rooted rust forms gray and black stripes on the raceway. In rolling bearings with fretting corrosion, you can see rust areas on the outer surface of the outer ring or in the bore of the inner ring. Prevention is the best way. The following are some methods to prevent corrosion of rolling bearings:
(1) Use waterproof grease as a lubricant. This can act as a protective barrier in slightly humid environments.

(2) Apply a protective coating. Chromium and nickel plating, thermally sprayed zinc, and black oxide. This is a coating that can prevent rolling bearings from rusting.

(3) Try different materials. In highly corrosive environments, ceramic bearings may be required.
The corrosion of rolling bearings is increasing day by day, and we should actively investigate and fill gaps to avoid accidents.