TY - JOUR
T1 - Investigation of subsequent deposit growth on pre-existing lubricant deposits
T2 - a substitutional growth model
AU - Kouame, Sylvain Didier B.
AU - Vander Wal, Randy L.
AU - Perez, Joseph
N1 - Publisher Copyright:
Copyright © 2016 John Wiley & Sons, Ltd.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - The Penn State Micro-Oxidation (PSMO) test was used in an inverse manner to pre-cover metallic pan surfaces with polymeric, transitioning and carbonaceous films. These pre-coated pans were then used as the initial test specimen/surface upon which fresh lubricant samples were aged. The effects of pre-deposits of varied ages were gauged against the baseline of a virgin metallic surface to decouple the lubricant-deposit system towards resolving their effect upon further deposit growth. From such data, a uniform deposition model describing deposit formation and aging was developed. Chemical characterisation of PSMO deposits by Fourier transform infrared-attenuated total reflectance and energy-dispersive X-ray spectroscope analyses provide additional supporting evidence of changes in chemical bonding (alkyl C–H and carbonyl C=O bond stretching vibrations) and composition (C- and O-atom content) as the deposits undergo deoxygenation and dehydrogenation reactions. Across different aged oils and films, the substitution tests show a declining activity towards mass deposition with film age, interpreted as decline in reactivity.
AB - The Penn State Micro-Oxidation (PSMO) test was used in an inverse manner to pre-cover metallic pan surfaces with polymeric, transitioning and carbonaceous films. These pre-coated pans were then used as the initial test specimen/surface upon which fresh lubricant samples were aged. The effects of pre-deposits of varied ages were gauged against the baseline of a virgin metallic surface to decouple the lubricant-deposit system towards resolving their effect upon further deposit growth. From such data, a uniform deposition model describing deposit formation and aging was developed. Chemical characterisation of PSMO deposits by Fourier transform infrared-attenuated total reflectance and energy-dispersive X-ray spectroscope analyses provide additional supporting evidence of changes in chemical bonding (alkyl C–H and carbonyl C=O bond stretching vibrations) and composition (C- and O-atom content) as the deposits undergo deoxygenation and dehydrogenation reactions. Across different aged oils and films, the substitution tests show a declining activity towards mass deposition with film age, interpreted as decline in reactivity.
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U2 - 10.1002/ls.1330
DO - 10.1002/ls.1330
M3 - Article
AN - SCOPUS:84960434435
SN - 0954-0075
VL - 28
SP - 267
EP - 280
JO - Lubrication Science
JF - Lubrication Science
IS - 5
ER -