eprintid: 9261 rev_number: 2 eprint_status: archive userid: 1 dir: disk0/00/00/92/61 datestamp: 2023-11-09 16:21:13 lastmod: 2023-11-09 16:21:13 status_changed: 2023-11-09 16:14:40 type: article metadata_visibility: show creators_name: Lubis, A.M.H.S. creators_name: Ariwahjoedi, B. creators_name: Sudin, M. title: XPS characterization of tribo-layer formation on the steel lubricated with crude and epoxidized jatropha oil under boundary lubrication ispublished: pub note: cited By 3 abstract: The composition of the tribo-layer formed during sliding of steel in the presence of crude jatropha oil (CJO) and epoxidized jatropha oil (EJO) under boundary lubricant application was investigated using energy-dispersive X-ray and X-ray photo spectroscopy analyses. Utilizing four ball method according to ASTM 4192, EJO showed better wear preventive properties and a lower friction coefficient compared to CJO. CJO and EJO oxidation led to oil chemisorption to steel surface causing formation of protective layers for the steel surface. The layers were constructed from inorganic oxide in the form of iron oxides and silicon oxide together with organic layers in form of aldehyde, ketone, and carboxylic acid. The formation and removal of this layer from rubbing sites are considered to impact wear-preventive and friction behavior of steel lubricated with CJO and EJO. date: 2017 publisher: Emerald Group Publishing Ltd. official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020906102&doi=10.1108%2fILT-09-2016-0203&partnerID=40&md5=80b6fbf70ebb39894e84846de5a48f02 id_number: 10.1108/ILT-09-2016-0203 full_text_status: none publication: Industrial Lubrication and Tribology volume: 69 number: 3 pagerange: 371-377 refereed: TRUE issn: 00368792 citation: Lubis, A.M.H.S. and Ariwahjoedi, B. and Sudin, M. (2017) XPS characterization of tribo-layer formation on the steel lubricated with crude and epoxidized jatropha oil under boundary lubrication. Industrial Lubrication and Tribology, 69 (3). pp. 371-377. ISSN 00368792