Thermodynamics of corrosion and potentiometric methods for measuring localized corrosion

Shukla, Prashant Kumar

doi:10.1533/9781845694050.1.156

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Potentiodynamic anodic polarization was has been used to evaluate the corrosion performance of porous NiTi-(Ar) and NiTi-(N) samples in Ringer's solution. Shukla [36] reported that the general view of the currentvoltage curve of the anodic dissolution of the alloy was characterized by an active dissolution, passivation, and passive state disturbance.…”

Section: Resultsmentioning

confidence: 99%

Mechanical properties and corrosion resistance of porous nickel titanium alloys synthesized in different reactive atmospheres

Marchenko,

Shishelova,

Baigonakova

et al. 2023

Phys. Scr.

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In the existing studies on the self-propagating high temperature synthesis of titanium nickelide, the main attention has been paid to the study of the influence of heating rate, synthesis start temperature, powder particle size, reaction gas pressure on the structure and properties of NiTi intermetallides. However, the influence of the reactive medium on the formation of surface intermetallic oxynitrides and the properties of the NiTi alloys has not been considered. In the present work, porous titanium nickelide alloys have been obtained by self-propagating high-temperature synthesis in two different reactive atmospheres, argon and nitrogen. The studies show that NiTi-(N) alloys synthesised in the nitrogen reaction atmosphere contain a large amount of brittle secondary Ti2Ni+Ti4Ni2O(N) phases which, in contrast to NiTi-(Ar), are predominantly distributed as small particles. The intergranular Ti2Ni phases in the NiTi-(Ar) alloy synthesised in the argon reaction atmosphere are observed as regions of extensive accumulation of Ti2Ni phase. The reactive nitrogen environment resulted in dispersion of the Ti2Ni phase and lower compressive strength of the porous NiTi-(N) alloy compared to NiTi-(Ar). However, both alloys have a compressive strength greater than human cancellous bone and can be successfully used for intraosseous implantation. At the same time, the porous alloys obtained in different reaction media are passive to electrochemical corrosion and resistant to dissolution in biological media containing chlorine.

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Section: Resultsmentioning

confidence: 99%

Mechanical properties and corrosion resistance of porous nickel titanium alloys synthesized in different reactive atmospheres

Marchenko,

Shishelova,

Baigonakova

et al. 2023

Phys. Scr.

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“…Corrosion potential values of various alloys in flowing seawater that are readily available (Shukla, 2008) are used to infer the relative nobility of the canister materials during extended storage. Table 4-7 lists the corrosion potentials of carbon steel, various stainless steel types, and aluminum-based alloys.…”

Section: Effects Of Residual Water On Storage Canister Internal Compomentioning

confidence: 99%

Effects of Residual Water on Storage Canister Internal Components

Shukla¹,

Sindelar²

2020

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This report describes an evaluation of the spent nuclear fuel cladding and canister internal materials' corrosion/oxidation due to (inadvertent) residual free water inside a dry storage canister post-dryout. Drying of spent nuclear fuel (SNF) and the impact of (inadvertent) residual water in a SNF canister is being addressed under the DOE-NE Spent Fuel and Waste Science and Technology (SFWST) program to ensure the safe extended dry storage and transportation of commercial SNF. A long-standing understanding has been that the amount of residual water in a storage canister after vacuum drying is not expected to be much more than trace amounts of 0.43 gram mole (NRC, 2010). However, recent findings from the High Burnup Demonstration project (Bryan et al., 2019a-c), and an Integrated Research Project (Knight, 2018) show that residual free water well above the amount of approximately 0.43 gm-moles that had been assumed for a 3 torr rebound pressure, may remain within an SNF canister following prototypic drying. In fact, an NRC-NMSS sponsored study considered residual water amount as high as 55 moles (CNWRA, 2013). Considering the recent findings and the NRC-sponsored work, this present work was conducted to study the effects of unspecified amount of residual water on oxidation and corrosion of canister internals, i.e., it was assumed that the residual water amount is not limiting. It was assumed that the spent nuclear fuel content in the canister is not exposed to the internal environment, i.e., the packaged canister does not contain any damaged (breached) fuel. The overall approach consisted of explicit accounting of both spatial and temporal variations of thermal conditions in a generic storage canister in the corrosion/oxidation of the materials. Radiolysis of the residual water is expected to result in the formation of hydrogen peroxide, both in liquid and vapor phase of the residual water. Literature information suggests that vapor phase hydrogen peroxide would decompose into oxygen and water; this reaction will be catalyzed by the cladding surface. On other hand, hydrogen peroxide in liquid water would persist. It was assumed that radiolysis would yield approximately 0.1 mole of hydrogen peroxide for each liter of residual water or 0.1 M concentration. Considering this, it was considered for the corrosion evaluation that hydrogen peroxide concentration in liquid phase residual water ranges between 0 to 2 M. Corrosion rates of various internal component materials were obtained as a function of temperature and hydrogen peroxide. Cladding materials' oxidation rates, reported in the previous study (Shukla, et al, 2019), were used. Additional analysis also indicated that cladding oxidation could only occur when temperatures are high enough for the residual water to be in vapor phase. Cladding oxidation rates and corrosion rates of the internal components were integrated with the spatial and temporal thermal conditions inside the canister for the storage period of 300 years. The specific components were those for the f...

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Comparison of Corrosion Behavior of CoCrNi Medium-Entropy Alloy with CoCrFeMnNi High-Entropy Alloy in SO2-Polluted Marine Environment

Zhang

Zhu

Yuan

et al. 2023

J. of Materi Eng and Perform

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Thermodynamics of corrosion and potentiometric methods for measuring localized corrosion

Cited by 3 publications

References 21 publications

Mechanical properties and corrosion resistance of porous nickel titanium alloys synthesized in different reactive atmospheres

Mechanical properties and corrosion resistance of porous nickel titanium alloys synthesized in different reactive atmospheres

Effects of Residual Water on Storage Canister Internal Components

Comparison of Corrosion Behavior of CoCrNi Medium-Entropy Alloy with CoCrFeMnNi High-Entropy Alloy in SO2-Polluted Marine Environment

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