Abstract
Corrosion of Ni and Ni-20Cr in molten ZnCl2 under argon atmosphere at 593 K was investigated using cyclic polarization in combination with various electron microscopy techniques. Cyclic polarization measurements yielded significantly lower corrosion rates for pure Ni than for Ni-20Cr. Corrosion of the Ni-20Cr alloy is attributed to selective anodic dissolution of Cr, which forms a chromium chloride film at the metal-salt interface. The corrosion in Ni and Ni-20Cr is accelerated by grain boundary attack through intergranular corrosion, followed by the formation of pore-salt network regions. The related corrosion mechanisms and dissolution kinetics are discussed.
Original language | English |
---|---|
Article number | 109105 |
Journal | Corrosion Science |
Volume | 179 |
DOIs | |
State | Published - Feb 2021 |
Funding
This work was supported as part of the Molten Salts in Extreme Environments Energy Frontier Research Center, funded by the U.S. Department of Energy, Office of Science . Brookhaven National Laboratory, Idaho National Laboratory, and Oak Ridge National Laboratory are operated under DOE contracts DESC0012704 , DE-AC07-05ID14517 , and DEAC05-00OR22725 , respectively. This research used resources of the ISS (8-ID) beamline at the National Synchrotron Light Source II operated by Brookhaven National Laboratory, a U.S. Department of Energy (DOE), Office of Science User Facility. This research used resources of the Center for Functional Nanomaterials, which is a U.S. DOE Office of Science Facility, at Brookhaven National Laboratory. This work was supported as part of the Molten Salts in Extreme Environments Energy Frontier Research Center, funded by the U.S. Department of Energy, Office of Science. Brookhaven National Laboratory, Idaho National Laboratory, and Oak Ridge National Laboratory are operated under DOE contracts DESC0012704, DE-AC07-05ID14517, and DEAC05-00OR22725, respectively. This research used resources of the ISS (8-ID) beamline at the National Synchrotron Light Source II operated by Brookhaven National Laboratory, a U.S. Department of Energy (DOE), Office of Science User Facility. This research used resources of the Center for Functional Nanomaterials, which is a U.S. DOE Office of Science Facility, at Brookhaven National Laboratory.
Keywords
- A Molten chloride salts
- A Nickel-chromium
- B Cyclic polarization
- B STEM/TEM
- C Intergranular corrosion