Abstract
The adsorption of model compounds of lubricating oil components on the cut steel surfaces was carried out under high vacuum. The estimated amount of adsorption was less than a monolayer level. The adsorption of nitrogen and n-hexane was not observed. The other adsorbates used were divided into two groups according to their adsorption activity on the cut surface. Benzene, cyclohexene and diethyl disulfide exhibited a high adsorption activity, while, propionic acid, propyl amine and trimethyl phosphate exhibited comparatively low activity. It is noteworthy that the functional group of the latter compounds was characterized by a lower polarizability than that of the former. The results were discussed on the basis of HSAB (Hard and Soft Acids and Bases) principle.
