Synergism between bio-based oleate ester and low-concentration ZDDP under reciprocating contacts

Shu, Ju (avtor), Espejo, Cayetano (avtor), Kalin, Mitjan (avtor), Morina, Ardian (avtor)

In this study, a bio-based ester was experimentally tested under a reciprocating contact in terms of the tribological performance to assess the potential of bio-based materials as boundary lubrication additives for low Sulphated Ash, Phosphorus, and Sulphur (SAPS) lubricants. A synergy in tribological performance has been observed when the ethyl oleate was used with a low concentration of ZDDP, showing both lower friction and wear loss, compared to only ethyl oleate or Zinc dialkyldithiophosphates (ZDDP) as single additives in base oil. SEM-EDX and ToF-SIMS analyses confirm that the additive combination of ester and low-concentration ZDDP generates a more evenly distributed tribo-film than that for only ZDDP as an additive. Although the tribo-film thickness of the ester/ZDDP lubricant combination, measured with AFM, issmaller than that for only low- concentration ZDDP, the combination shows superior wear protection ability over ZDDP. Mass spectra from ToF-SIMS show that the main component of the film formed by the additive combination is zinc polyphosphate, while the film generated from low-concentration ZDDP consists of short-chain iron phosphate. It is proposed that the ethyl oleate present in the additive combination alleviates severe shear in the contact, which promotes the formation of a uniform tribo-film composed of glassy zinc polyphosphate. The formed tribo-film enhances the adsorption of ester fragments, improving the tribological performance compared to using only ester as an additive. The obtained results demonstrate the potential of bio-based esters to reduce ZDDP usage and move towards greener lubricants.

• Jezik: Angleški jezik
• Ključne besede: bio-based ester, ethyl oleate, low-concentration ZDDP, reciprocation
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: Str. 1-11
• Številčenje: Vol. 192, art. 109252
• PID: 20.500.12556/RUL-154702
• UDK: 539.92:547-326
• ISSN pri članku: 0301-679X
• DOI: 10.1016/j.triboint.2024.109252
• COBISS.SI-ID: 186544643
• Datum objave v RUL: 23.02.2024

Gradivo je del revije

• Naslov: Tribology international
• Skrajšan naslov: Tribol. int.
• Založnik: Butterworth Scientific
• ISSN: 0301-679X
• COBISS.SI-ID: 26558976

Licence

• Licenca: CC BY-NC 4.0, Creative Commons Priznanje avtorstva-Nekomercialno 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc/4.0/deed.sl
• Opis: Licenca Creative Commons, ki prepoveduje komercialno uporabo, vendar uporabniki ne rabijo upravljati materialnih avtorskih pravic na izpeljanih delih z enako licenco.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: ester na biološki osnovi, etil oleat, ZDDP z nizko koncentracijo, recipročnost

Projekti

• Financer: EC - European Commission
• Program financ.: H2020
• Številka projekta: 860246
• Naslov: GreenTRIBOS
• Akronim: GreenTRIBOS

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0231
• Naslov: Tribologija