Differences in nano-topography and tribochemistry of ZDDP tribofilms from variations in contact configuration with steel and DLC surfaces

Čoga, Lucija (author), Akbari, Somayeh (author), Kovač, Janez (author), Kalin, Mitjan (author)

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.

• Language: English
• 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
• Year: 2022
• Number of pages: Str. 296–315
• Numbering: Vol. 10, iss. 2
• PID: 20.500.12556/RUL-134679
• UDC: 539.92
• ISSN on article: 2223-7690
• DOI: 10.1007/s40544-021-0491-7
• COBISS.SI-ID: 88250627
• Publication date in RUL: 25.01.2022

Record is a part of a journal

• Title: Friction
• Shortened title: Frict.
• Publisher: Tsinghua University Press
• ISSN: 2223-7690
• COBISS.SI-ID: 525351449

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• 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

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

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0231
• Name: Tribologija

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