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Anti-wear
Table of Contents Physical & Chemical Properties Anti-wear additives are those which reduce or control wear. They form organic, metallo-organic, or metal salt films on the surface. Sliding or rolling occurs on top of, or within, the films thus reducing metal-to-metal contact. Anti-wear additives only reduce the rate of wear, which still occurs, but without a catastrophic failure. The films are sacrificed so that the wear fragments in the oil are primarily the film material. Anti-wear performance is measured on numerous bench lubricant testers operating under moderate conditions, where the volume or weight of material removed is measured. An example is the 4-ball wear test. Also, the pin-on-disk apparatus is used and run under conditions described in ASTM G 99-90. The types of anti-wear additives are zinc dialkyldithiophosphates (ZDDP), carbamates, organic phosphates such as tricresyl phosphates, organic phosphates and chlorine compounds. The most common anti-wear additive is ZDDP, which decomposes to deposit metallo-organic species, zinc sulfide or zinc phosphate, or reacts with the steel surface to form iron sulfide or iron phosphate. Operating conditions control the specific film material. For more information call 1-888-HERGUTH (437-4884) |
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