|About this Abstract
||2010 TMS Annual Meeting & Exhibition
||General Abstracts: Structural Materials Division
||Observation and Detection of Corrosion on Aerospace Bearing Steels in Ester Based Lubricants
||Michael Hurley, Cole Smith, Darryl Butt
|On-Site Speaker (Planned)
Lubricant degradation or contamination in jet turbine engines is a precursor to corrosion of the bearing materials. Once corrosion is initiated, the eventual outcomes are decreased engine performance, required service, and parts replacement. Characterization of the bearing steel corrosion behavior in the engine environment is elusive since typical electrochemical corrosion measurements are ineffective due to ultra high solution resistance of the lubricating fluid. In this work EIS (Electrochemical Impedance Spectroscopy) and in-situ optical microscopy were utilized in an effort to characterize the corrosion behavior of M50 and P675 bearing steels tested in a range of water and chloride contaminated ester based oils. EIS was found to be sensitive to water contamination levels and relatively insensitive to chloride contamination level and the presence of active corrosion. Further insight in to the corrosion behavior was obtained via optical microscopy of the complex interaction of water, oil, and steel microstructure in-situ.
||Definite: A CD-only volume