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Anti-Fretting Coatings

anti fretting coatings

Fretting is a particular wear problem in situations where two contacting parts vibrate or oscillate together over very small rubbing distances, so they hardly move out of their contact area. Wear debris (from adhesive wear) becomes trapped; it oxidises, and that oxide then causes further wear through abrasion. So fretting is often a self perpetuating wear situation, with considerable quantities of oxide dust being released.

To understand wear types fully, including fretting, we recommend you read our tutorial on wear and wear resistant coatings.

For anti-fretting, Poeton recommend specific coatings from their Apticote range. Most fretting occurs with metals that oxidise easily, such as mild steel or aluminium. The best anti-fretting solutions come with coatings that donít easily oxidise, such as electroless nickel. If the coatings are combined with a solid lubricant like MoS2, the results are even better. (Please follow the links to the product pages for detailed data on applications and performance.)

Thermal spray coatings, specifically molybdenum metal, which provides low friction and slow oxidation, ideal as an anti-fretting coating.

Electroless Nickel. This is a moderately wear resistant coating, and its resistance to corrosion makes it one of the best anti-fretting coatings, particularly if combined with a low friction polymer or lamella lubricant (like MoS2), as in Apticote 460.

Hard Anodising. Applicable only to aluminium alloys, hard anodising produces a hard oxide wear resistant coating, transformed from the parent metal rather than deposited as a separate coating. The hard oxide provides an anti-fretting coating by reducing the adhesive wear and the consequent production of abrasive wear debris. The best anti-fretting coating for aluminium is achieved by combining the hard anodising with a self lubricating polymer, as in Apticote 350. Note that it is best suited for light loads, with area contact Ė for instance a gasket face.

Silver Plating can also act as an anti-fretting coating, since the silver does not readily oxidise and provides relatively low friction. It is used mainly in specialist, high tech applications.

anti fretting coatings

Such anti-fretting coatings are applicable across a wide range of industrial sectors. Please follow the Markets menu tag on our Home Page to find your specific industry.