X-ray absorption near-edge structure analysis of tribofilms generated by highly efficient, friction-reducing additive in water–polyglycol–glycol lubricant
✍ Scribed by Haibing Ma; Lulu Peng; Peipei Liang; Rui Qiao; Tianhui Ren
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 435 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0954-0075
- DOI
- 10.1002/ls.91
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✦ Synopsis
Abstract
The development of environment‐friendly lubricant additives can make a valuable contribution to addressing human health and energy problems. In the present work, the compound ammonium tetrathiomolybdate was synthesised and used as a highly efficient, friction‐reducing additive in water–polyglycol–glycol lubricants. Its tribological properties were tested by a four‐ball machine, and the composition of the tribofilm was identified by X‐ray absorption near‐edge structure (XANES) spectroscopy. The tribological test results indicated that the additive cannot only reduce the friction coefficient value, but can also shorten the rubbing time needed to produce a ‘stable friction coefficient value’. The XANES results showed that the tribofilm is mainly composed of an adsorbed layer and a tribochemical layer; the formation of sulphate and molybdenum trioxide in the tribofilm on the metal wear surface is responsible for the excellent anti‐friction performances of the additive. Copyright © 2009 John Wiley & Sons, Ltd.