ABSTRACT
Surfactants and polymers used in boundary lubrication systems adsorb on solid surfaces and form a protective lm. The effectiveness of boundary lubricants has often been attributed to the adsorption afnity and the integrity of the adsorbed lm. Such adsorption is inuenced by additives incorporated into the system to reduce thermal degradation, corrosion, sludge formation, foaming, etc. There are many interactions that can take place between the additives, the surfactants, and the base oil, leading, in addition to adsorption effects, to a number of interfacial and colloidal phenomena such as micellization, precipitation, and solubilization as well as occulation of particulate matter in uid [1-3].
