Abstract
AbstractAntiwear and extreme‐pressure additives labelled with 35S were synthesised by reacting 35S2Cl2 with isobutylene and treating the adduct with potassium xanthate, or by labelling the unlabelled compound with elemental 35S in boiling carbon di‐sulphide. Static adsorption tests of the labelled additives on iron or copper specimens show an adsorption increase with temperature. The data are in good agreement with the results of thermal analysis of the additive as such or mixed with iron or copper powder. The behaviour of the oil solutions containing labelled additives on a friction machine emphasised the formation of superficial layers on a metallic surface containing the reaction products of the additive decomposition compounds with the metal. The thickness of these layers remains nearly constant during the test but increases with normal load. Pyridine washing of the specimens removes adsorbed layers whereas chemisorbed layers remain on the metallic surface.
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