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The possible partial replacement of zinc dialkyldithiophosphate (ZDDP) by a multifunctional additive (borate-sulphonate micellar compound) was studied. X-ray absorption spectroscopy at the phosphorus, sulphur and boron edges was used to determine the chemistry of the tribochemical films, both at the surface and in the bulk. XANES data suggest an interaction between ZDDP and the borate additive. The...
The effect of contact load and volume of lubricant in the time to tribofilm breakdown and extent of wear was examined in fully formulated oil with zinc dialkyl dithiophosphate as the main anti-wear additive. The mechanism of tribofilm formation and breakdown was followed carefully by monitoring the friction coefficient over the duration of the test. Tribological tests conducted with limited lubricant...
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