TY - JOUR
T1 - The effect of zdp’s on the surface chemistry of hydrocarbon films on oxidized iron substrates
AU - Rhodes, K. L.
AU - Stair, P. C.
N1 - Funding Information:
The authors wish to acknowledge Professors Herbert Cheng and Yip-Wah Chung for many valuable discussions on the subject of this work and Dr. Steven Roby of the Lubrizol Corporation for supplying the PAO, isooctyl ZDP and aryl ZDP. Suppor~w as provided by the Center for Engineering Tribology, Northwestern University. This work made use of Central Facilities supported by the National Science Foundation through Northwestern University Materials Research Center, Grant No. DMR 8821571.
PY - 1993/1
Y1 - 1993/1
N2 - The thermal chemistry of lubricant molecules adsorbed on polycrystalline iron substrates has been studied using X-ray photoelectron spectroscopy (XPS). The lubricants examined mere a synthetic, poly-a-olefin base oil and a base oil containing three different zinc dialkyldithiophosphates (ZDP’s); isooctyl ZDP, isopropyl ZDP, and an aryl ZDP. The major focus of the work was to determine the influence of the base oil and additives on the thermal reduction of the native iron oxide passivating film. The kinetics of iron oxide film reduction were analyzed using a sequential reaction scheme, i.e., (Equation found), with temperature-dependent rate constants determined by fitting to time-and temperature-dependent XPS data. The authors conclude that the presence of base oil accelerates oxide film reduction and that ZDP moderates this effect to some degree.
AB - The thermal chemistry of lubricant molecules adsorbed on polycrystalline iron substrates has been studied using X-ray photoelectron spectroscopy (XPS). The lubricants examined mere a synthetic, poly-a-olefin base oil and a base oil containing three different zinc dialkyldithiophosphates (ZDP’s); isooctyl ZDP, isopropyl ZDP, and an aryl ZDP. The major focus of the work was to determine the influence of the base oil and additives on the thermal reduction of the native iron oxide passivating film. The kinetics of iron oxide film reduction were analyzed using a sequential reaction scheme, i.e., (Equation found), with temperature-dependent rate constants determined by fitting to time-and temperature-dependent XPS data. The authors conclude that the presence of base oil accelerates oxide film reduction and that ZDP moderates this effect to some degree.
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U2 - 10.1080/10402009308983128
DO - 10.1080/10402009308983128
M3 - Article
AN - SCOPUS:0027338939
SN - 1040-2004
VL - 36
SP - 27
EP - 34
JO - Tribology Transactions
JF - Tribology Transactions
IS - 1
ER -