Wear and Tribofilm Formation With Zinc-free Antiwear Additives
Pichumani, Pradip Sairam
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Engine oil is used in all internal combustion engines to lubricate the moving parts & mitigate the wear due to friction. Along with the mentioned two functions, engine oil also serves to protect the engine from corrosion, clean debris, improves sealing and serves in thermal conductivity. Engine oil is either derived from petroleum derivatives or made synthetically. A number of additives are added to the engine oil (Base oil) to improve its performance and longevity. Antioxidants, pour point depressants, viscosity index improvers, antifoaming agents, corrosion inhibitors, etc are some of the additives that are added to improve the engine oil‘s performance.The main goal of this study is to understand the mechanism of formation of tribofilms from combining ashless additives, their synergistic and antagonistic properties and wear performance with different blends of these additives. Wear tests were performed using high frequency reciprocating rig in order to map the effects of wear and tribological properties of ashless antiwear additives on 52100 steel at 100°C and 1 Kg load. X-ray absorption near edge structure spectroscopy (XANES) was performed on the tribofilms in order to investigate the chemical properties of films generated by the combination of ashless fluorothiophosphates and ashless dialkyl dithiophosphates ashless antiwear additives.