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Chemistry of ZDDP tribofilm studied by synchrotron techniques

August 28, 2009
Jigang Zhou

Antiwear films were generated from formulations of zinc dialkyldithiophosphate (ZDDP) and various dispersants in base oil on 52100 steel in a pin-on-disk configuration within a boundary lubrication regime.   

X-ray absorption near edge structure (XANES) spectroscopy at the S, P, O, N, B, and Zn absorption edges and synchrotron light-based X-ray photoelectron spectroscopy (SR-XPS) were used to investigate the interactions of ZDDP and dispersants and to identify the chemical species formed in the antiwear films.  Coupled with the XANES results, SR-XPS with variable photon energy has been used to non-destructively elucidate the depth compositions and chemical variations from ~1nm to ~3 nm into the antiwear films.     

These new insights into the chemical characteristics of the antiwear films will be correlated with the wear performance as measured using the wear scar width on the pin and coefficient of friction.  This talk will show that XANES spectroscopy and SR-XPSare very valuable tools in exploring the chemistry of antiwear films.

Jigang Zhou
Canadian Light Source Inc
Saskatoon, SK S7N 0X4
(306)657 3587

Notice Required: 1 Month
Willing to Travel: Internationally

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