Add time:10/01/2019         Source:sciencedirect.com

The tribological behaviour of zinc di-n-butyl dithiophosphate in steel-on-bronze contacts has been studied in a three-pin-on-disc wear machine under closely controlled conditions, whilst parameters such as load, sliding speed, additive concentration and roughness of the steel disc were varied systematically. Most of the work was carried out with a mineral base oil having a low sulphur content. The work has shown that there are several ways in which the presence of the zinc di-n-butyl dithiophosphate in the oil can influence the wear of the bronze.Firstly, the zinc di-n-butyl dithiophosphate modifies the top surface layer of the bronze which results in a decrease of mechanical wear, i.e. adhesive and abrasive wear processes, but which promotes chemical wear. The net effect is to promote wear when the concentration of the additive is high and the lubrication conditions are mild, i.e. smooth discs and high sliding speeds. It has been observed that the net effect can also be to inhibit wear at low concentrations of the additive and intermediate roughnesses of the steel disc.Secondly, the zinc di-n-butyl dithiophosphate interacts with the steel surface by protecting the asperity tips on the steel against wear. With the base oil alone the asperities are allowed to run in and thereby reduce wear, but the additive prevents running in. This mechanism predominates when the roughness of the steel disc is high.

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