1. Hot corrosion behavior of the spray-formed nickel-based superalloy
- Author
-
Chong-Lin Jia, Tian-Fu Gu, Chang-Chun Ge, and Min Xia
- Subjects
010302 applied physics ,X-ray spectroscopy ,Materials science ,Scanning electron microscope ,Metallurgy ,General Physics and Astronomy ,Halide ,chemistry.chemical_element ,02 engineering and technology ,Atmospheric temperature range ,021001 nanoscience & nanotechnology ,01 natural sciences ,Corrosion ,Superalloy ,Nickel ,chemistry ,0103 physical sciences ,0210 nano-technology ,Layer (electronics) - Abstract
An investigation of low temperature hot corrosion is carried out on a spray-formed nickel-based superalloy FGH100 pre-coated with Na2SO4-NaCl at 700 °C for 100 h. Mass gain measurement, x-ray diffraction, scanning electron microscopy, and energy dispersive x-ray spectroscopy are used to study the corrosion behavior. Results reveal that corrosion behavior follows a sequence, that is, first rapidly proceeding, then gradually slowing down, and finally forming an outer layer composed of different types of oxides and an inner layer mainly comprised of sulfides. In-depth analysis reveals that the hot corrosion of FGH100 is a combined effect of oxidation-sulfidation and transfer of oxides.
- Published
- 2016