Abstract:The antioxidant content determines the remaining useful life of lubricants,so a quick and simple detecting method of the antioxidant content is especially important for the study of lubricants.The principles and methods of the determination of antioxidant content in lubricants by linear sweep voltammetry were studied,and the effect of the electrolyte and the scanning rate on the appearing of the voltammetric peak of antioxidants in measurement system based on PARSTAT 2273 electrochemical workstation was explored.The results show that when the scan rate is 5 mV/s and the electrolyte is composed of sodium dodecyl sulfate(SDS),ethanol and sulfuric acid,the voltammetric peak appears for the phenol and amine antioxidants in the synthetic oil and mineral oil,and the antioxidant voltammetric peak shows a positive correlation trend with the antioxidant content in base oil,indicating it is feasible to determine the antioxidant content in base oil by linear sweep voltammetry.The linear sweep voltammetry is quick and simple,which can be used for the determination of the antioxidant content in synthetic oil and mineral oil.Good results are achieved for this method used in the determination of the continuous consumption of T501 antioxidant in synthetic oil and mineral oil with the aging time