Journal
TRIBOLOGY INTERNATIONAL
Volume 121, Issue -, Pages 21-29Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2018.01.033
Keywords
Borate ester; Tribological properties; XPS; Tribological film
Categories
Funding
- National Key R&D Program of China [2017YFB0306700]
- National Natural Science Foundation of China [51605381]
- Chinese Postdoctoral Project [2017M613171]
- Shaanxi Provincial Natural Science Foundation of China [2017JQ5101]
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To reduce the dosage of zinc diallcyldithiophosphates (ZDDP) in engine oil, the synthesis and characterization of a novel borate ester containing a phenylboronic group (BDDP) was reported. The thermogravimetric analysis results showed that BDDP had a better thermo-stability compared with that of commercial additives ZDDP and F10A. The tribological properties of the PAO 6 base oils containing BDDP, ZDDP and F10A were studied using a four-ball tester and SRV tribo-meter. The oil with a BDDP concentration of 0.8% showed tribological properties superior to those of the ZDDP and F10-containing oil under varying applied loads and elevated temperature conditions. The elemental composition of the tribological film generated on the worn surfaces of the steel balls was detected by X-ray photoelectron spectroscopy (XPS), and the results indicated that the tribological film was composed of Fe2B and B2O3. Thus, BDDP could be a candidate to replace ZDDP or reduce the dosage of ZDDP in engine oil.
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