Differences in nano-topography and tribochemistry of ZDDP tribofilms from variations in contact configuration with steel and DLC surfaces
ID Čoga, Lucija (Author), ID Akbari, Somayeh (Author), ID Kovač, Janez (Author), ID Kalin, Mitjan (Author)

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In this work, we evaluated the effect of the counter-body material (the same or dissimilar) and contact configuration (moving or stationary body), at similar contact tribological conditions, on the tribochemical and nanotopography characteristics of adsorbed surface films. Zinc dialkyldithiophosphate (ZDDP), the best performing anti-wear additive, was used in self-mated steel/steel and DLC/DLC contacts, which were compared with mixed steel/DLC and DLC/steel contacts in 1-h and 6-h sliding tests. The macroscale (tribometer) and nanoscale (atomic force microscopy) friction, thickness, topography, and chemical (attenuated total reflection-Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy) properties of the tribofilms were studied. The results revealed unexpectedly large differences in all the studied tribofilm parameters; this is because all the tribofilms are completely different; this includes the chemical composition, which is known to have a crucial effect on the nano- and macro-scale tribological properties. These results clearly demonstrate that the surface material, additives, and common contact operating parameters, that is, pressure, velocity, and temperature, crucially affect the ZDDP tribofilm as well as the position of the moving or stationary surface within the contact, and the material of the moving/stationary bodies.

Keywords:dithiophosphate, diamond-like carbon, steels, tribofilms, tribochemistry, nano-friction, thickness, topography
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Number of pages:Str. 296–315
Numbering:Vol. 10, iss. 2
PID:20.500.12556/RUL-134679 This link opens in a new window
ISSN on article:2223-7690
DOI:10.1007/s40544-021-0491-7 This link opens in a new window
COBISS.SI-ID:88250627 This link opens in a new window
Publication date in RUL:25.01.2022
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Shortened title:Frict.
Publisher:Tsinghua University Press
COBISS.SI-ID:525351449 This link opens in a new window


License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:10.04.2021
Applies to:Published online

Secondary language

Keywords:dithiofosfat, diamantu podoben ogljik, jekla, tribofilmi, tribokemija, nanotrenje, debelina, topografija


Funder:ARRS - Slovenian Research Agency
Project number:P2-0231

Funder:ARRS - Slovenian Research Agency
Project number:J2-7115
Name:Nanoinženiring kontaktnih površin in mejnih filmov za doseganje zelenih tehnologij mazanja

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