Abstract
A wear machine in which samples were observed through the countersurface as they were sliding in lubricating engine oils was used to obtain insight into the antiwear action of zinc dialkyldithiophosphates (ZDDPs). Good antiwear activity was associated with the formation of a friction-polymer-like material in the oil at the leading edge of contacts and with the formation of a thick film on the wear surface. Poor boundary lubrication action was associated with the formation of lesser amounts of friction polymer and with bare metal surfaces. Steady state appearances usually developed within a few centimetres of sliding, with the progression of events depending more upon distance slid than velocity (range 0.03–4.3 mm s −1). The observed interaction between the friction polymer and the surface film and the rapidity of their formation put the antiwear activity of ZDDPs into a new perspective.
Published Version
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