Figure 1 The lab-designed aviation lubrication oil comparative oxidation appliance
The color number of the oxidized oil samples could be measured by the petroleum products chromometer (SYD-0168, Shanghai Jingxi Instruments Co. Ltd.) that follows the petroleum products color number mensuration standard (SH/T 0168-1992). Differential Scanning Calorimeter (DSC, PerkinElmer DSC 8000) is applied to determine the incipient oxidation temperature (IOT) of the oxidized oil samples. The Gas Chromatography-Mass Spectrometry (GC-MS, PerkinElmer Clarus 680/SQ 8T) in this paper is applied to study the molecular structure of the products in oxidized oil specimens. The total acid number is tested according to GB/T 7304-2014 standard by automatic potentiometric titrator (model: SQ-600), and the antiwear properties of the oxidized oil samples are tested according to GB/T 3142 standard by four-ball tester (made in Jinan, model: MRS-10G/P).
3Results and discussion