In order to evaluate the applicability of biodegradable base-oil lubricants for railway applications, theinfluence of UV(ultraviolet)-B light (280–320 nm) on oxidation stability and the tribologicalperformance of rapeseed oil (RO) have been investigated. Antioxidant free RO was oxidized immediatelyunder UV-B irradiation at moderate temperature. Three sterically hindered phenolic-type antioxidants,pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2-6-di-tert-butyl-4-methyl phenol were tested in order to increase theoxidation stability of RO. Pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) wasthe most effective, prolonging the oxidation induction time from 3 h of RO to 40h. The tribologicalperformance of RO could be improved by the addition ofmetallic detergent (Ca–alkylsalicylate–CaCO3) andwas stable against the UV-B irradiation.
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