Interpretation of experiments on ZDDP anti-wear films through pressure-induced cross-linking

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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“…These have demonstrated that the properties of the ZDDP tribofilm layers are dependent on applied load [20,21].…”

Section: Mechanical Properties and Durability Of Zddp Tribofilmmentioning

confidence: 98%

“…Mosey et al [20] developed a new theory for the functionality of ZDDP tribofilms at the molecular level. They suggested that pressure-induced cross-linking is the reason for chemically-connected networks and many aspects of experimentally-observed behaviour of ZDDP can be explained by this theory.…”

Section: Mechanical Properties and Durability Of Zddp Tribofilmmentioning

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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“…Mosey et al [47] developed a new theory for the functionality of ZDDP tribofilms at the molecular level. They suggested that pressure induced cross-linking is the reason for chemically connected networks and many experimentally validated behaviours of ZDDP can be explained by this theory.…”

Section: Tribofilm Propertiesmentioning

confidence: 99%

Development of a new mechano-chemical model in boundary lubrication

Ghanbarzadeh

Wilson

Morina

et al. 2016

Tribology International

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“…Mosey et al [11][12][13] found that the decomposition of ZDDP form highly cross-linked networks under temperatures of 100-1000 K (-173 -727 ℃) and high pressure by Car-Parrinello molecular dynamic (CPMD), and its bulk modulus is 140 GPa.…”

Section: Fem Modelmentioning

confidence: 99%

Experimental and Numerical Study on the Effect of ZDDP Films on Sticking During Hot Rolling of Ferritic Stainless Steel Strip

Líu

Jiang

Wei

et al. 2016

Metall Mater Trans A

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The aim of this study is to investigate the effect of zinc dialkyl dithio phosphate (ZDDP) films on sticking during hot rolling of a ferritic stainless steel strip. The surface characterization and crack propagation of the oxide scale are very important for understanding the mechanism of the sticking. The high-temperature oxidation of one typical ferritic stainless was conducted at 1373 K (1100 °C) for understanding its microstructure and surface morphology. Hot-rolling tests of a ferritic stainless steel strip show that no obvious cracks among the oxide scale were observed with the application of ZDDP. A finite element method model was constructed with taking into consideration different crack size ratios among the oxide scale, surface profile, and ZDDP films. The simulation results show that the width of the crack tends to be reduced with the introduction of ZDDP films, which is beneficial for improving sticking. Abstract:The aim of this study is to investigate the effect of zinc dialkyl dithio phosphate (ZDDP) films on sticking during hot rolling of a ferritic stainless steel strip. The surface characterization and crack propagation of the oxide scale are very important for understanding the mechanism of the sticking. The high-temperature oxidation of one typical ferritic stainless was conducted at 1373 K (1100 ℃) for understanding its microstructure and surface morphology.Hot-rolling tests of a ferritic stainless steel strip show that no obvious cracks among the oxide scale were observed with the application of ZDDP. An finite element method (FEM) model was constructed with taking into consideration different crack size ratios among the oxide scale, surface profile, and ZDDP films. The simulation results show that the width of the crack tends to be reduced with the introduction of ZDDP films, which is beneficial for improving sticking.

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Interpretation of experiments on ZDDP anti-wear films through pressure-induced cross-linking

Cited by 66 publications

References 61 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

Development of a new mechano-chemical model in boundary lubrication

Experimental and Numerical Study on the Effect of ZDDP Films on Sticking During Hot Rolling of Ferritic Stainless Steel Strip

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