The tribological properties and action mechanism of non-active organic molybdate ester and its combination with ZDDP

摘要

A non-active molybdate ester (ME) was synthesized in a batch process. Its tribological performance and its synergistic effect with ZDDP in 5CST were evaluated using a four-ball machine, and the chemistry of tribofilms was analyzed with XANES. The results indicate that ME possesses excellent anti-wear and friction-reducing properties, not load-carrying capacity. Both ME and ZDDP show excellent synergistic tribological behavior in 5CST. According to the XANES results, the tribochemical films generated from ME alone are mainly composed of MoO_3, and the tribochemical films generated from the oil blends containing ME and ZDDP consist mainly of MoS_2, sulphate and polyphosphate.