Response of NiCrAl-bentonite abradable seal coatings to thermal/salt corrosion

The growing need for engine services in marine environments has resulted in increasing salt and coupled corrosion of abradable seal coatings (ASCs). In this study, the response of NiCrAl-bentonite ASCs to thermal/salt corrosion was assessed. The results indicated that NiCrAl-bentonite ASCs could provide excellent protection for TC4 alloys in marine environments. NiCrAl-bentonite ASCs retained their low hardness and high strength and exhibited good abradability in chloride-rich environments. Compared with the Al-, Ni-, and YSZ-based coatings, the proposed coating demonstrated improved synergy between strength and hardness/abradability. This research provides valuable insights into the reliable use of NiCrAl-bentonite ASCs in marine environments.