Structural characterisation of iron sulfide tribofilms formed on carbon and stainless steels

This study investigated tribofilm layers formed under boundary lubrication using a polysulfide additive on S45C and SUS304 steel surfaces. In the tribotests, the friction coefficient of the SUS304 disc fluctuated and increased more gradually in comparison to that of the S45C disc. The tribofilm on t...

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Bibliographic Details
Published inLubrication science Vol. 36; no. 1; pp. 22 - 35
Main Authors Miyajima, Makoto, Yonemura, Mitsuharu, Kitamura, Kazuyuki, Matsumoto, Keishi, Yagi, Kazuyuki
Format Journal Article
LanguageEnglish
Published London Wiley Subscription Services, Inc 01.01.2024
Subjects
Austenitic stainless steels
Boundary lubrication
Coefficient of friction
Iron sulfides
Lubrication
polysulfide
Pyrite
Scuffing
stainless steel
Structural analysis
sulfur‐containing additives
tribofilm
Troilite
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Summary:This study investigated tribofilm layers formed under boundary lubrication using a polysulfide additive on S45C and SUS304 steel surfaces. In the tribotests, the friction coefficient of the SUS304 disc fluctuated and increased more gradually in comparison to that of the S45C disc. The tribofilm on the S45C disc comprised the outermost and inner layers of FeS2 (pyrite) and FeS (troilite), respectively. Notably, all the tribofilm layers on the SUS304 disc surface contained pyrite. The tribofilm on the SUS304 disc was weakly crystalline in the outermost layer and thinner than that on the S45C disc. The poor formation of the tribofilm on the SUS304 disc was potentially caused by the unstable friction coefficient and scuffing.
ISSN:0954-0075
1557-6833
DOI:10.1002/ls.1668