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Battling Corrosion with Lubrication and Sealing Part 1

(Part 1 of 3)

One of the main challenges for bearing manufacturers is providing products that maximize corrosion protection, while maintaining material strength and load capacity.

Bearing housings are available in coatings, platings, and 304 and 316 series stainless steels, as well as nonmetallic polymers such as PBT, polypropylene, and polyamide resins. Common coatings used on cast-iron or steel-mounted bearing housings include powder epoxy paint, nickel, and nylon. Some offerings are more effective against certain chemicals, loads, and general environment than others. The key is to select the right housing material option based on the application.

In addition to housing protection, the bearing itself should be considered. Stainless steels are offered for inner rings, rollers, and outer rings in material grades such as 420, 410, 303, 304, and the most popular, 440C. However, many of the stainless steels offered do not maintain the same load-carrying capacities of the ferrous steel counterparts. Additionally, stainless steels are not inert with many chemicals and environments. Therefore, many common ball bearing product offerings include a plated option for additional protection. Much like housings, the bearing should be selected for the application with performance expectations balanced against cost and functionality.

This is a 3 part series so please check back soon!




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