The adsorption of zinc di-isopropyldithiophosphate from n-hexadecane onto iron powder and onto EN31 steel disks has been studied as a function of time, temperature, and additive concentration. 65Zn and 14C radiolabelling has been used to probe aspects of adsorption behavior. The ZDDP is adsorbed onto disk surfaces but there is subsequent loss of Zinc from the adsorbed layer. Both parent ZDDP and zinc-depleted product appear to be physisorbed. A simple model based on Langmuir kinetics, and which allows for adsorption and desorption processes, gives a satisfactory representation of observed behavior. Activation parameters have been calculated. Some comments have been made on the relation between adsorption and antiwear activity.
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Dacre et al. (1982) studied this question.
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