EXTREME PRESSURE SYNERGISTIC MECHANISM OF BISMUTH NAPHTHENATE AND SULFURIZED ISOBUTENE ADDITIVES

Xin Xu (), Jianqiang Hu, Shizhao Yang, Feng Xie and Li Guo
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Xin Xu: Department of Aviation Oil and Material, Air Force Logistics College, Xuzhou 221000, China
Jianqiang Hu: Department of Aviation Oil and Material, Air Force Logistics College, Xuzhou 221000, China
Shizhao Yang: Department of Aviation Oil and Material, Air Force Logistics College, Xuzhou 221000, China
Feng Xie: Department of Aviation Oil and Material, Air Force Logistics College, Xuzhou 221000, China
Li Guo: Department of Aviation Oil and Material, Air Force Logistics College, Xuzhou 221000, China

Surface Review and Letters (SRL), 2017, vol. 24, issue 05, 1-12

Abstract: A four-ball tester was used to evaluate the tribological performances of bismuth naphthenate (BiNap), sulfurized isobutene (VSB), and their combinations. The results show that the antiwear properties of BiNap and VSB are not very visible, but they possess good extreme pressure (EP) properties, particularly sulfur containing bismuth additives. Synergistic EP properties of BiNap with various sulfur-containing additives were investigated. The results indicate that BiNap exhibits good EP synergism with sulfur-containing additives. The surface analytical tools, such as X-ray photoelectron spectrometer (XPS) scanning electron microscope (SEM) and energy dispersive X-ray (EDX), were used to investigate the topography, composition contents, and depth profile of some typical elements on the rubbing surface. Smooth topography of wear scar further confirms that the additive showed good EP capacities, and XPS and EDX analyzes indicate that tribochemical mixed protective films composed of bismuth, bismuth oxides, sulfides, and sulfates are formed on the rubbing surface, which improves the tribological properties of lubricants. In particular, a large number of bismuth atoms and bismuth sulfides play an important role in improving the EP properties of oils.

Keywords: Bismuth naphthenate; sulfurized isobutene; additives; extreme pressure; antiwear; synergism (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500718

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