Corrosion behavior and mechanism of GH3535 alloy in NaOH, HF and H2O2 solution

Zhou, Yuying; Liu, Qi; Tang, Zhongfeng; Liu, Yan

doi:10.1016/j.jallcom.2021.161387

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…Oak Ridge National Laboratory (USA) and the Institute of Metal Research, Chinese Academy of Sciences (China) have developed alloy materials that are resistant to molten salt corrosion, such as Hastelloy N and GH3535 alloys, respectively. The corrosion properties of these alloys have been tested in high-temperature molten fluoride salt systems at 700 °C in air and inert environments [8][9][10] ; notably, the Hastelloy N and GH3535 alloys exhibited good molten salt corrosion resistance. Nevertheless, these materials cannot meet the corrosion rate requirements for commercial applications.…”

Section: Introductionmentioning

confidence: 99%

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Zhang

et al. 2022

npj Mater Degrad

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The use of molten-salt–based energy production and storage systems requires high-temperature corrosion- and creep-resistant structural materials. This study investigated the microstructure evolution and corrosion characteristics of Hastelloy N under working stress in a molten salt environment. Selective diffusion of Cr at the grain boundaries (GBs) of the Hastelloy N degraded the properties of the GBs, making them preferred locations for corrosion crack invasion. Stress further promoted Cr diffusion and accelerated GB carbide precipitation, thereby forming a corrosion couple between the carbide and matrix that facilitated the expansion of intergranular corrosion cracks into the grains. These findings are useful for providing advances in the design of novel structural alloys with extraordinary property-microstructure stability combinations for resistant to complex molten salt environments.

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Section: Introductionmentioning

confidence: 99%

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Zhang

et al. 2022

npj Mater Degrad

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“…Pitting pores are found on the surface of movable latch after 6.5 million steps, as shown in Figure 10b. The falling off of carbides may be responsible for this situation [26,27].…”

Section: Wear Resultsmentioning

confidence: 99%

Wear Characteristics of the Nuclear Control Rod Drive Mechanism (CRDM) Movable Latch Serviced in High Temperature Water

et al. 2022

Chin. J. Mech. Eng.

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The current research of nuclear control rod drive mechanism (CRDM) movable latch only makes a simple measurement of wear mass. The wear volume and difference in various claw surfaces are ignored and the degradation mechanism of each claw surface is not clear. In this paper, a detailed degradation analysis was carried out on each claw surface of movable latch combined with wear result and worn morphology. Results indicate that the boundary of carbide is preferred for corrosion because carbide presents a nobler Volta potential compared to the metal matrix or boundary region. Due to the oscillation of drive shaft between the claw surfaces of movable latch, the dominant wear mechanism on the upper surface of claw (USC) and lower surface of claw (LSC) is plastic deformation caused by impact wear. Mechanical impact wear will cause the fragmentation of carbides because of the high hardness and low ductility of carbides. Corrosion promotes the broken carbides to fall off from the metal matrix. The generated fine carbides (abrasive particles) cause extra abrasive wear on USC when the movable brings the drive shaft upward or downward. As a result, USC has a higher wear volume than LSC. This research proposes a method to evaluate the wear on the whole movable latches using a 3D full-size scanner.

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“…Successively, the 304 SS samples were washed ultrasonically by the absolute ethanol and deionized water, and stored in the glove box with high-purity Ar gas. 14 Also, the high purity nickel crucible was used as the container due to its high chemical inertness toward the molten NaNO 3 -based salt, which was cleaned ultrasonically in the absolute ethanol and deionized water for 5–10 minutes, 15 then dried in the oven to remove the residual water, finally stored in the aforementioned glove box.…”

Section: Methodsmentioning

confidence: 99%

The corrosion behavior of 304 stainless steel in NaNO₃–NaCl–NaF molten salt and vapor

Lai

Liu

et al. 2022

RSC Adv.

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Corrosion behavior and mechanism of GH3535 alloy in NaOH, HF and H2O2 solution

Cited by 6 publications

References 23 publications

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Wear Characteristics of the Nuclear Control Rod Drive Mechanism (CRDM) Movable Latch Serviced in High Temperature Water

The corrosion behavior of 304 stainless steel in NaNO₃–NaCl–NaF molten salt and vapor

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Corrosion behavior and mechanism of GH3535 alloy in NaOH, HF and H2O2 solution

Cited by 6 publications

References 23 publications

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Wear Characteristics of the Nuclear Control Rod Drive Mechanism (CRDM) Movable Latch Serviced in High Temperature Water

The corrosion behavior of 304 stainless steel in NaNO3–NaCl–NaF molten salt and vapor

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The corrosion behavior of 304 stainless steel in NaNO₃–NaCl–NaF molten salt and vapor