Importance

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Abstract

A corrosion resistant bearing includes a bearing insert and a housing supporting the bearing insert. The bearing insert includes an outer ring, an inner ring and a plurality of rolling bearing elements disposed between the rings. At least one of the bearing components includes a multi-layer corrosion resistant system for inhibiting or delaying corrosion of the substrate of the component. The substrate may be made of high carbon or alloy steel. The corrosion resistant system includes a galvanic or sacrificial metallic plating layer disposed directly on the component substrate. One or more mechanical protection layers is formed or disposed over the plating layer. A first mechanical protection layer includes a clear chromate coating formed on the plating layer. Additional mechanical protection layers include non-metallic layers, such as acetate or polytetrafluoroethylene coatings. The plating layer and the mechanical protection layers may extend over the bearing ring component raceway, or one or more of the layers may stop short of the raceway. In a method for making the component, a mask may be applied to regions of the component over which one or more the protective layers is not to be applied.

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First Claim