Effect of additive combinations on tribofilm formation in fully formulated 0W‐8 oil

Huang, Chao; Aoki, Saiko

doi:10.1016/j.triboint.2024.109714

Cited by 3 publications

(1 citation statement)

References 38 publications

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“…Furthermore, the internal structure of tribofilm has been investigated using XPS, XANES, and other chemical methods. Martin et al [11] proposed a two-layer structure of ZDDP tribofilm comprising a top layer of longchain polyphosphate and a bottom layer of mixed Fe/Zn short-chain phosphate with embedded metal sulfide precipitates Additionally, the inclusion of factors such as water and dispersant can modify the length of the phosphate chains, consequently changing the formation thickness and wear resistance of the tribofilm [12][13][14]. Hsu [15] demonstrated that under high pressure, tribofilm exhibits a zinc-rich tribofilm, an oxide layer, and sulfur enrichment, with a higher zinc content observed in the upper part and increased iron content in the lower part of the tribofilm.…”

Section: Introductionmentioning

confidence: 99%

Impact of tribofilm on the anti-wear and friction-reduction properties of interfaces

Ge,

Lyu,

Zhang

et al. 2024

Phys. Scr.

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Zinc Dialkyl Dithiophosphate (ZDDP) is widely used in internal combustion engine lubricating oil, which forms tribofilm and effectively blocks the direct contact of the material interface. Tribofilm plays an important role in wear resistance and lubrication performance. This study analyses ZDDP additive lubricant performance and the tribofilm distribution under different concentrations and loads. Tribofilm formation and wear mechanism is characterized by Scanning electron microscope (SEM) and Energy dispersive X-ray spectrometer (EDS), and the lubrication performance is further explained by the Atomic Force Microscope (AFM). This study explored the anti-wear and friction-reducing properties of ZDDP tribofilm respectively, revealing that ZDDP tribofilm distribution plays a pivotal role in reducing wear, the wear amount can be reduced by 50%, but has a slight effect on friction-reducing, only 5.7%. In addition, the concentrations and loads significantly affect the growth of the tribofilm, and change the wear and lubrication characteristics. The tribofilm acts as a significant barrier, effectively protecting the surface from wear. However, excessive pressure may lead to the failure of the tribofilm, resulting in the loss of protection and subsequent severe wear of the surface. Furthermore, the mechanisms of lubrication are explained, wherein the tribofilm serves as micro-texture, reducing direct contact between asperities and thereby lowering the friction coefficient.

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