This
paper describes natural garlic oil (NGO) as a high-performance,
environmentally friendly, extreme pressure additive for lubricating
oils. The chemical composition of NGO was analyzed by gas chromatography–mass
spectrometry (GC-MS). The load-carrying capacities of NGO and sulfurized
isobutylene (SIB) in different base fluids were comparatively evaluated
by a four-ball tester and an optimol SRV-IV oscillating reciprocating
friction and wear tester (SRV tester). The four-ball test results
revealed that incorporation of 1 wt % NGO into the base fluids could
significantly improve the weld point of the base fluids from approximately
126 to 800 kgf or higher. Moreover, the four-ball test and SRV test
results demonstrated that NGO could provide superior load-carrying
ability in the selected base fluids than the conventional extreme
pressure additive SIB. In addition, X-ray photoelectron spectroscopy
(XPS) results showed that NGO and SIB experienced a similar tribochemical
process with the generation of tribofilms composed with iron oxides,
iron sulfates, iron sulfide, etc. NGO showed great promise for use
as an effective, eco-friendly, extreme pressure additive for application
in environmentally sensitive areas.
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