The effect of corrosion inhibitor on corrosion of automotive materials in Biodegradable engine oil

Abstract

Bio-degradability is one of the major issue in the disposal of used synthetic engine lubricants, by considering this the development of vegetable based engine lubricants shows more attention, the corrosion of engine parts owing to its usage under bio-lubricant environment can be suspected due to its hygroscopic nature. This work aims to analyse the effect of blend of poly-ethylene glycol and benzotriazole as corrosion inhibitor on ferrous and non-ferrous metals in chemically modified rapeseed oil based bio- degradable engine oil as per ASTM D6594. Scanning Electron Microscope (SEM) analysis shows that the pitting corrosion over the surfaces of lead and copper is found more comparatively with other metals in the bio lubricant environment without corrosion inhibitor, the metals immersed in the bio-lubricant with inhibitor provides the protective oxide film layer over the metallic surfaces restrict the corrosion rate.