1. H Fujita and H. A. Spikes (2004) The formation of zinc dithiophosphate antiwear films. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 218(4): 265-278 https://doi.org/10.1243/1350650041762677, AbstractIn situ spacer layer interferometry has been used to monitor and compare the formation of both tribo- and thermal zinc dialkyldithiophosphate (ZDDP) films on steel surfaces. For the ZDDP solution studied, negligible thermal film formation takes place below a temperature of 110 °C, but a ZDDP tribofilm is generated on rubbed surfaces even at room temperature. The ZDDP tribofilm formation is critically dependent on the extent of direct solid solid contact during rubbing and does not take place if the elastohydrodynamic film thickness is significantly greater than the surface roughness. Tests at different slide-roll ratios indicate that the rate of ZDDP tribofilm formation is proportional to the product of sliding distance and rubbing time. Based on the results, it is not possible to explain ZDDP tribofilm formation in terms of a response to contact pressure or flash temperature. It is likely that the tribofilm reaction is either strongly catalysed by species released during rubbing, such as soluble FeII or FeIII, or is triggered by triboelectronic processes such as exoelectron emission.
2. Zhang, Jie and Spikes, Hugh (2016) On the mechanism of {ZDDP} antiwear film formation. Tribology Letters 63: 1--15 Springer
3. Pilotti, B and Prieto, Germ{\'a}n and Juan, Alfredo and Faccio, Ricardo and Broitman, Esteban and Dennehy, Mariana and Tuckart, Walter Roberto (2021) {Bi$$_2$$S$$_3$$} and {MoS$_2$} soft coatings: a comparative study of their frictional behavior under different humidity levels, normal loads, and sliding speeds. Tribology Letters 69(3): 112 Springer
4. Prieto, Germ{\'a}n and Pilotti, Bruno and Sobanski, Germ{\'a}n and Bajos, Jairo and Tuckart, Walter R and Dennehy, Mariana (2023) Enhancing the Tribological Performance of {MoS$$_2$$} Coatings in Humid Environments with the Addition of {Bi$_2$S$$_3$$}. Tribology Letters 71(1): 18 Springer
5. Bao, Yichen and Deng, Jianxin and Wang, Junyan and Wang, Ran and Sun, Qinghao and Wu, Jiaxing (2023) Tribological properties of {Bi$$_2$$S$$_3$$}/{MoS$_2$} composite coatings deposited on biomimetic leaf vein textured surfaces. Tribology Letters 71(3): 97 Springer