Influence of PMA on the anti-scuffing properties of AW/EP additives

Scuffing is becoming a quite common failure mode in gears and bearings. It has been shown that AW/EP additives are effective preventing scuffing, but only if they able to form thick tribofilm before encountering severe scuffing-type conditions. This study employed contra-rotating, step-sliding speed scuffing test explore the impact of PMAs on ability ZDDP commercial SP additive-containing package prevent when subjected immediately found some can greatly enhance anti-scuffing performance these additives. They do this by forming thick, adsorbed boundary films withstand high sliding conditions protect rubbing surfaces long enough for tribofilms form.