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Corrosion Protection For Steel Bearing

Author : Matthew McKernan

Submitted : 2010-05-07 09:48:18    Word Count : 443    Popularity:   11

Tags:   corrosion resistant coatings, wear resistant coatings, coating solutions

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Coatings are applied to the surfaces of rolling bearing components without forming a material bond, for example by diffusion, between the coating and base material.

In many cases, it is sufficient to coat only part of the bearing or one of the parts that come into rolling contact.

As well as offering special corrosion-resistant coatings such as Corrotect , Protect A and Protect B, it can also provide a range of corrosion-resistant materials for rolling bearings that operate in corrosive environments.

While standard steel bearing materials provide satisfactory corrosion resistance in many applications, for higher performance requirements, highly corrosion-resistant, nitrogen alloyed martens tic HNS (high nitrogen) steels.

Cronitect is a new high-grade martensitic hardening steel, developed for rolling bearings, which offers maximum corrosion resistance under extreme conditions, for example, in dry running applications or when the bearings are in contact with aggressive media such as water, acids and cleaning agents.
In contrast to Cronidur, Cronitect has nitrogen introduced into the structure by means of a surface layer hardening process.

Based on the consistent refinement of high-grade NIROSteels, Cronitect achieves a very high hardness through its chemical composition, in combination with a new thermo-chemical surface layer treatment process.

The material is therefore able to withstand extreme conditions, including salt spray testing in accordance with DIN 50021 SS without any problems, even after 600 hours.

The resistance to corrosion is many times better than that of conventional NIROSteels.

Rolling bearings that use corrosion protection can come in either a sealed or nonsealed version.

The name Cronitect is derived from the chemical composition of the material and from its special heat treatment process.

The 'tect' suffix is found in other coating products and refers to the material's corrosion protection.

Both Cronidur and Cronitect are superior to conventional corrosion-resistant steels for rolling bearings in terms of corrosion resistance, wear resistance and fatigue strength.

This means they have very high corrosion resistance against aqueous media and heavily diluted acids, alkalines or salt solutions.

Other special materials include ceramic rolling bearing components.
Silicon nitride balls, for example, are light and offer a longer operating life than standard steel ball elements.

High-performance plastics such as PEEK can also be used for bearing components operating in corrosive environments.

PEEK is resistant to high temperatures and, depending on the load, is suitable for operating temperatures of up to 250C.

The wear resistance is strongly influenced by the filler materials and is significantly better than that of the PA66 standard material with glass fiber re-enforcement that is often used for bearing cages.

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Click on the links provided for more information on corrosion resistant coatings, wear resistant coatings and coating solutions.

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