Abstract: The oxidation stability of turbine engine lubricant is evaluated by corrosion and oxidation stability test method. In this paper the correlations of some evaluation indexes including total acid number, viscosity varied rate and the amount of deposits formed are discussed. Test results showed that the variation trends of total acid number and viscosity varied rate could reflect and predict the changing trend of deposits in some extent, yet without positive or quantitative correlations could be used to predict one another. Besides, using DSC two-peak method to predict the formation trend of deposits in oxidation stability test is not mature right now.

Key words: Corrosiveness and Oxidation stability, DSC Two-Peak Method, Deposits, Total acid value, Viscosity