The Adsorption and Desorption of Zinc Di-isopropyldithiophosphate on Steel

Dacre, B.; Bovington, C. H.

doi:10.1080/05698198208983124

Cited by 37 publications

(20 citation statements)

References 8 publications

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“…It is reported that adsorption of the ZDDP molecules on the substrate is necessary prior to the formation of any surface films [3,4]. Surface studies show that ZDDP thermal films are different from tribofilms [5][6][7].…”

Section: Zddp As An Anti-wear Additivementioning

confidence: 99%

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

Parsaeian

Ghanbarzadeh

Eijk

et al. 2017

Applied Surface Science

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Understanding the true interfacial mechanisms involved in the growth of tribofilms generated by Zinc Dialkyl Dithiophosphate (ZDDP) is important because it is the most widely used antiwear additive and there is legislative pressure to find efficient environmentally-friendly replacements. The main focus of this study is to investigate the durability of the ZDDP tribofilm and correlate it to the chemical and physical properties of the glassy polyphosphates.A novel experimental method has been developed to study the effect of lubricant temperature and contact load on tribofilm growth and durability. Results show that physical parameters such as temperature and pressure significantly influence the tribofilm durability. XPS analyses were carried out before suspending the test and after changing the oil to assess the difference in chemical structure of the tribofilm before and after stopping the test. The chemical analyses suggest that there are different chemical properties across the thickness of the tribofilm and these determine the durability characteristics.

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Section: Zddp As An Anti-wear Additivementioning

confidence: 99%

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

Parsaeian

Ghanbarzadeh

Eijk

et al. 2017

Applied Surface Science

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show abstract

“…The literature regarding the composition and formation of ZDDP derived antiwear films for hardened steel on hardened steel is extensive and controversial. One mechanism of film formation views that ZDDP adsorbs onto the metal surfaces and then undergoes decomposition at the rubbing surfaces to form the protective film [6][7][8]. Another, perhaps more widely held view of the mechanism of film formation holds that ZDDP decomposes in oil, and that it is these decomposition products which react with the rubbing surfaces to form the protective film [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

X-ray absorption spectroscopy of antiwear films on aluminum alloys generated from zinc dialkyldithiophosphate

et al. 1995

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The boundary lubrication of A1 alloys 6061 (AI-6% Si) and A-390 (Al-18 wt% Si), by a sec-ZDDP (zinc dialkyldithiophosphate) oil blend was examined at 60 andl00~ The wear performance in the ZDDP blend was an improvement on base stock. At 100~ the ZDDP prevented scuffing, though no antiwear films could be detected due to the severe wear. At 60~ all samples showed initial scuffing followed by a more controlled wear given by an embedded antiwear film. P L-edge X-ray near-edge structure (XANES) spectroscopy using synchroton radiation was used to characterize the antiwear and thermally generated deposition films on the A1 alloys. P L-edge XANES results of the antiwear films at 100~ showed the absence of a polyphosphate film. A well-developed polyphosphate film was indicated at 60~ very similar to that formed on steel at 100~ P L-edge XANES results of the thermal deposition films showed the presence of only unchanged sec-ZDDP at 125~ with no polyphosphate present. A polyphosphate film was present at 200~ similar to the antiwear film for A1 alloy at 60~ and steel at 100~

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“…The formation of FeS (unlike ZnS when the molecule is ZnDTPA) has more EP additive applications. In XPS, peak intensity of FeSO 4 is comparable with that of the PO 4 3) indicating comparable amounts of sulfates and phosphates in these films unlike in the case of ZnDTPA. Although the thickness and phosphate chemistry is same at all rubbing times it is the rate at which the pads are nucleated and grow (which is governed by the rate of the reaction of the additives with the substrate) controls the life of these pads and the overall wear of the components.…”

Section: Ashless Thiophosphatesmentioning

confidence: 56%

“…The molecules decompose at temperatures above 60°C and react with iron surfaces to yield sulphides and polyphosphates [3][4][5]. The polyphosphates are glassy [6][7][8] and when tribostressed yield friction coefficient of the order of 0.2 [8].…”

Section: Introductionmentioning

confidence: 99%

Dry sliding tribology of dioctyldithiophosphoric acid deposited on steel at 150 °C

2006

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Dioctyldithiophosphoric acid was deposited on 7 nm (RMS) rough steel surfaces at 150°C to create a densely packed (area-95%) deposit of glassy phosphate islands of maximum 500 nm height. This standard substrate was subjected to dry lubricated ballon-disc tribology using a 2 mm diameter steel ball in the 25-500 mN normal load range at a sliding velocity of 1 mm/s. The experiments recorded friction coefficient of the order of 0.18 but the life of the film as it wears out with sliding distance was found to decline with increasing load. The life-load characteristics that we record in these experiments, we argue, can only be explained if there is a load induced growth of the deposited film during sliding. We record this load induced growth to yield phosphate islands which are significantly smaller but harder than those grown by thermal activation alone.

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The Adsorption and Desorption of Zinc Di-isopropyldithiophosphate on Steel

Cited by 37 publications

References 8 publications

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

X-ray absorption spectroscopy of antiwear films on aluminum alloys generated from zinc dialkyldithiophosphate

Dry sliding tribology of dioctyldithiophosphoric acid deposited on steel at 150 °C

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