Abstract
For present and future advanced aerospace bearing applications, it is significant and necessary to improve the corrosion resistance of carburized CSS-42L steel. In this study, Cr films of about 1 μm in thickness were fabricated onto carburized CSS-42L bearing steel using a filtered cathodic vacuum arc deposition system. The corrosion behavior of carburized CSS-42L steel with Cr films was investigated. The Cr film was composed of nanocrystalline α–Cr. The electrochemical experimental results indicated that the current density had two orders of magnitude decrease and the corrosion potential evidently increased after Cr film deposition. The protective efficiency of this Cr film was as high as 99.7%. Nanocrystalline exhibits a higher corrosion resistance and enhances the modification effect of Cr film on carburized CSS-42L steel.
Highlights
Aircraft engines are one of the most sophisticated engineering technologies [1]
Generation main shaft bearings for future advanced gas turbine engines should operate under conditions of extreme temperature, high loads and harsh, corrosive environments [7]
We investigated the fabrication of Cr films on carburized CSS-42L steel substrate using the filtered cathodic vacuum arc technique (FCVA) deposition system
Summary
The impact of the gas turbine engine on the development of the aircraft industry creates urgent requirements for better materials and designs for bearings. They need to tolerate increased system temperature, speed and load capability [1,2,3,4]. The dominant bearing failures are caused by surface-initiated fatigue resulting from contaminants such as corrosion pit [4,5,6]. Generation main shaft bearings for future advanced gas turbine engines should operate under conditions of extreme temperature, high loads and harsh, corrosive environments [7].
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