Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

Lei Wan; Zeyu Zhang; Wenquan Wang; Yunpeng Xue; Jubao Shen; Tao Sun; Haiou Sun

doi:10.3390/ma15041512

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

Materials (Basel). 2022 Feb 17;15(4):1512. doi: 10.3390/ma15041512.

Authors

Lei Wan¹, Zeyu Zhang¹, Wenquan Wang², Yunpeng Xue³, Jubao Shen², Tao Sun¹, Haiou Sun¹

Affiliations

¹ College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China.
² Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China.
³ AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang 110043, China.

Abstract

The corrosion of cobalt-based DZ40M and nickel-based K452 superalloy at 900 °C was investigated by NaCl salt coating. Accordingly, the differences in hot corrosion behavior were analyzed considering the development methods and elementary composition by comparing the two alloys' failure. Then, the corrosion mechanism induced by NaCl was proposed by comparing oxidation and hot corrosion behavior. The relatively continuous Al₂O₃ and TiO₂ formed on K452 superalloy with higher content of Al and Ti have lower solubility and less damage in Na₂O. Thus, the hot corrosion rate of K452 is lower than that of DZ40M with higher content of C, Cr, and W.

Keywords: DZ40M; K452; NaCl molten salt; hot corrosion.