The chemical constitution of tribofilms, generated from zinc dialkyldithiophosphate (ZDDP) and ashless dialkyldithiophosphate (DDP), has been examined by X-ray Absorption Near Edge Structure (XANES) spectroscopy. The identification of spectral features and interpretation of the results for P, O, Fe, and S species are given, allowing an overall mechanism to be deduced. The role of Fe in these films was investigated in some detail using P L-edge, O K-edge and Fe L-edge XANES spectra.
Tribofilms Generated From ZDDP and DDP on Steel Surfaces: Part 2 — Chemistry
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Zhang, Z, Yamaguchi, ES, Kasrai, M, Bancroft, GM, Liu, X, & Fleet, ME. "Tribofilms Generated From ZDDP and DDP on Steel Surfaces: Part 2 — Chemistry." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 1. Washington, D.C., USA. September 12–16, 2005. pp. 619-620. ASME. https://doi.org/10.1115/WTC2005-63251
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