Tribological performance of 2‐mercaptobenzothiazole derivatives as lubricating oil additives

The paper's aim is to study tribological performances of two 2‐mercaptobenzothiazole derivatives which are ashless and lacking in phosphorous as lubricating oil additives in HVIW H150 base oils.

The two 2‐mercaptobenzothiazole derivatives were synthesized; their tribological performances were evaluated with a four‐ball machine, and the worn surface was analyzed with a X‐ray photoelectron spectroscopy (XPS).

The two compounds possess good anti‐wear properties and excellent load‐carrying capacity. According to the XPS results, the additive reacted with counter‐face metal and generated a sulphur‐containing inorganic film consisting of FeS, FeS₂ and FeSO₄, and a complex N‐containing resin polymer film.

Their antioxidant properties are not estimated, and their anti‐wear action mechanism need to be further explored.

Two useful ashless AW lubricating oil additives were synthesized, and may be has potential as gas engine lubricating oil additives.

This paper provides a study of some N, S‐containing heterocyclic compounds as lubricating oil additives.