Study On The Lubrication And Corrosion Resistance Of Oil Soluble Ionic Liquids

Lubricating oil is the most common liquid lubricant and an effective means to avoid mechanical loss due to friction.However,during the friction process,the surface damage of the friction pair often leads to corrosion of the sliding interface.In order to solve the above problems,this paper designed and synthesized a series of ionic liquids with integrated lubrication and corrosion protection properties as lubricating oil additives.Using the molecular design concept,introducing groups with active elements or strong adsorption capabilities into the same molecular structure,an ionic liquid with both lubrication and corrosion resistance capabilities is obtained,which serves as a magic reducing and anti wear additive for base oil and has certain interface protection functions.The specific research content is as follows:1.Three quaternary ammonium phosphate ionic liquids with different alkyl chain lengths(N₁₁₁₁₁₆-D.P,N₈₈₈₁₆-D.P,N₁₁₁₆₁₆-D.P)were designed and prepared.The effects of changes in cationic chain length and steric hindrance on their physicochemical properties,lubricating properties,and corrosion resistance were investigated.Contrary to traditional research,when the cation chain length increases,if its spatial steric resistance is increased,the decrease in adsorption performance will lead to a decrease in the quality of its interfacial adsorption film,which will affect its tribological and corrosion resistance properties.Research has shown that as an important oil based lubricating additive,the use of a cationic structure with a smaller steric resistance can improve the lubrication and corrosion resistance of N-PILs.2.Imidazole compounds are excellent anti wear additives,and multi-curyl ester compounds have excellent corrosion resistance and self-cleaning properties.Using molecular design,urea-based functional groups and long alkyl chains were introduced into the molecular structure of imidazole to improve the oil solubility and adsorption properties of imidazole cations,and multi-curyl ester groups were introduced into the anionic structure to improve the corrosion resistance of ionic liquids.Finally,a geminized ionic liquid（2M16-DOSS）was obtained.The effects of different concentrations（0 wt%,0.5 wt%,1 wt%,2 wt%）on tribological properties were investigated at room temperature and high temperature.It was found that2M16-DOSS ionic liquids exhibited excellent wear reduction and antiwear properties.At the same time,the study found that the ionic liquid lubricating additive also had good corrosion resistance,which was due to the coordination between the ionic liquids and the metal substrate,forming an effective anti-corrosion protective film.3.In order to explore the feasibility of phosphate organic guanidine ionic liquid（P8-G）as a lubricant additive,its tribological properties were studied in polyethylene glycol（PEG 400）.The tribological properties of P8-G system at room and high temperatures were tested using a SRV-IV reciprocating friction testing machine.The test results show that P8-G has good lubrication performance in PEG 400 at room temperature and high temperature.In order to explore its lubrication mechanism,the surface morphology and elemental distribution of wear spots were analyzed using three-dimensional topography,scanning electron microscopy,and EDS.Analysis shows that P8-G is adsorbed on the surface of the friction pair and undergoes a tribochemical reaction with the metal substrate,forming a stable tribochemical reaction film.P8-G system does not contain high pollution substances such as halogen,and can be widely used as a green and efficient lubricating oil additive.