Investigation of the effect of a diamine-based friction modifier on micropitting and the properties of tribofilms in rolling-sliding contacts

Soltanahmadi, Siavash; Morina, Ardian; Eijk, Marcel C. P. van; Nedelcu, Ileana; Neville, Anne

doi:10.1088/0022-3727/49/50/505302

Cited by 38 publications

(44 citation statements)

References 55 publications

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“…In XPS, a surface‐sensitive quantitative spectroscopic technique is applied to obtain the composition of different elements as well as the chemical and electrical state of the elements within the tested material. Through irradiating a material with a beam of X‐rays, the XPS spectra can be obtained and the kinetic energy and number of electrons that escape from the top 0 to 10 nm of the material can be measured simultaneously . The residual chamber pressure was always below 1 × 10 −7 Pa during spectra acquisition.…”

Section: Methodsmentioning

confidence: 99%

“…The asperity contact stress was also considered to be a main factor to promote the formation of micropits, thus this contact fatigue phenomenon can be retarded by the increase of lambda ratio or reduce of surface roughness. However, recently, Soltanahmadi et al found out that more micropits formed with enhanced reaction layer thickness between the contacting surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Effect of base oil polarity on the micropitting behaviour in rolling‐sliding contacts

Cen

Morina

Neville

2019

Lubrication Science

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An automated micropitting test rig that uses the proven three‐point contact configuration was applied to study the effect of base oil polarity on micropitting behaviour in rolling‐sliding contacts. The tribological tests using one polar (ester) and one non‐polar (polyalpha olefin [PAO]) base oil mixed with four different additives were first done in a micropitting rig to study the friction, wear, and micropitting performance. The tested specimen after tribological tests were examined by an optical microscope to study the micropitting on the surface. The X‐ray photoelectron spectroscopy (XPS) was applied to obtain the related tribochemical information from the reaction layer. The results showed that higher wear and less micropits formed when testing with ester‐based lubricants. This was related to the higher affinity to the steel surface of polar base oil molecules that can compete with additives to attach to the surface, resulting in a thinner reaction layer and shorter chain phosphates.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of base oil polarity on the micropitting behaviour in rolling‐sliding contacts

Cen

Morina

Neville

2019

Lubrication Science

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“…The results suggested that the extreme pressure (EP) or anti-wear (AW) additives might lead to a greater micropitting damage on the gear surfaces at the running-stage under severe working conditions, such as heavy loading and higher roughness. Soltanahmadi et al [115] studied the effect of N-tallow-1, 3-diaminopropane (TDP) on micropitting in order to develop lubricants with no or minimal environmental impact. The results revealed that the TDP-containing lubricant was effective in mitigating the micropitting damage.…”

Section: Lubrication Conditionsmentioning

confidence: 99%

A Review on Micropitting Studies of Steel Gears

Liu

Zhu

et al. 2019

Coatings

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With the mounting application of carburized or case-hardening gears and higher requirements of heavy-load, high-speed in mechanical systems such as wind turbines, helicopters, ships, etc., contact fatigue issues of gears are becoming more preponderant. Recently, significant improvements have been made on the gear manufacturing process to control subsurface-initiated failures, hence, gear surface-initiated damages, such as micropitting, should be given more attention. The diversity of the influence factors, including gear materials, surface topographies, lubrication properties, working conditions, etc., are necessary to be taken into account when analyzing gear micropitting behaviors. Although remarkable developments in micropitting studies have been achieved recently by many researchers and engineers on both theoretical and experimental fields, large amounts of investigations are yet to be further launched to thoroughly understand the micropitting mechanism. This work reviews recent relevant studies on the micropitting of steel gears, especially the competitive phenomenon that occurs among several contact fatigue failure modes when considering gear tooth surface wear evolution. Meanwhile, the corresponding recent research results about gear micropitting issues obtained by the authors are also displayed for more detailed explanations.

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“…Furthermore, AW additives have been shown to accelerate micropitting [33][34][35][36]. ZDDP can rapidly form a tribofilm on the surface resulting in a delayed effect on proper running-in wear and increasing the probability of asperity-asperity contact.…”

Section: The Effect Of Zddp and Water On Micropittingmentioning

confidence: 99%

“…ZDDP can rapidly form a tribofilm on the surface resulting in a delayed effect on proper running-in wear and increasing the probability of asperity-asperity contact. The delayed running-in, rough nature of the ZDDP tribofilm and its chemical modification in severe rolling-sliding contacts [36], which can enhance localised plastic deformation, are ascribed to be the reason behind micropitting-enhancing behaviour of ZDDP [37]. Alongside the ZDDP effect on micropitting, water contamination is also assumed to enhance micropitting wear in the bearings and gears lubricated with fully-formulated oils [38][39][40].…”

Section: The Effect Of Zddp and Water On Micropittingmentioning

confidence: 99%

Tribochemical study of micropitting in tribocorrosive lubricated contacts: The influence of water and relative humidity

Soltanahmadi

Morina

Eijk

et al. 2017

Tribology International

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Water ingress into the lubricant as a contaminant affects performance leading to an alteration in wear, corrosion and fatigue behaviour of the tribological components especially in the rolling element bearings. The current study addresses the tribochemical phenomena involved in micropitting in tribocorrosion systems where different levels of dissolved-water are present in a model lubricant. In this study the effect of different temperatures, water concentrations and relative humidities have been investigated on micropitting under rolling/sliding contacts. The influence of free and dissolved water on tribocorrosive micropitting is clarified. The tribochemical change of the reaction films is studied using X-ray Photoelectron Spectroscopy (XPS) which confirmed that the (poly)phosphate chain length and tribofilm thickness are reduced with increased dissolved-water level.

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Investigation of the effect of a diamine-based friction modifier on micropitting and the properties of tribofilms in rolling-sliding contacts

Cited by 38 publications

References 55 publications

Effect of base oil polarity on the micropitting behaviour in rolling‐sliding contacts

Effect of base oil polarity on the micropitting behaviour in rolling‐sliding contacts

A Review on Micropitting Studies of Steel Gears

Tribochemical study of micropitting in tribocorrosive lubricated contacts: The influence of water and relative humidity

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