Corrosion Properties of Candidate Materials in Supercritical Water Oxidation Process

Tang, Xingying; Wang, Shuzhong; Qian, Lili; Ren, Mengmeng; Sun, Panpan; Li, Yanhui; Yang, Jian

doi:10.1515/jaots-2016-0119

Cited by 10 publications

(4 citation statements)

References 63 publications

(112 reference statements)

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“…Owing to the potential of use of SC water in next generation nuclear reactors, renewable energy generation systems, efficient treatment of organic waste, and so on, a large volume of corrosion studies have been conducted to examine the effect of SC water on various metals and alloys. Tang et al (2016) have presented an extensive summary of these results (based on 120 published articles from 1994 to 2014) on iron-based alloys, Ni-based alloys, titanium-based alloys, ceramics, and pure metals such as zirconium, niobium, tantalum, and molybdenum. Their conclusion is that "no single material can withstand all kinds of SCWO (SC water oxidation) conditions."…”

Section: Nonreacting and Noncorrodingmentioning

confidence: 99%

Existence of Supercritical "Liquid-Like" State in Subcritical Region, Optimal Heat Transfer Enhancement, and Argon as a Nonreacting, Noncorroding Sc Heat Transfer Fluid

2022

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Supercritical (SC) fluid, which was discovered exactly two hundred years ago, was initially thought to have only one state with no distinction between the liquid and vapor. It is now considered to have two distinct regions --"liquidlike" and "gas-like," with thermophysical properties exhibiting anomalous behavior near the critical point (CP). This work highlights that the anomalous behavior, as observed above CP in the Widom region, extends to pressures and temperatures much below the critical pressure P c and/or critical temperature T c . Indeed, the anomalous region starts within the subcritical liquid state and extends well into the SC region. Motivated by many applications, extensive research has been devoted to thermal transport by SC water and CO 2 . However, both of these fluids are reactive and corrosive, and require high pressures (P c = 217.8 and 72.8 atm, respectively); SC water also needs high temperature (T c = 373.95°C for water). This paper presents, for the first time, argon as an alternative SC fluid for thermal transport, whose P c is lower (47.994 atm) and it can work at low temperatures (T c = -122.46°C). Argon is easily-available, nonreactive, noncorrosive, and environmentally benign. A thermal transport analysis of fully developed flow of SC Ar through an isothermally heated duct and its comparison with SC CO 2 and water demonstrates that for similar rates of heat transfer, the increase in cost of using argon is small, in terms of flow work required, whereas the benefits are substantial with regard to complexity (due to P c being much lower), operational maintenance, and life of the thermal systems. It is also revealed that 2 to 3 orders-of-magnitude enhancement in gaseous state heat transfer is possible by moving from subcritical to high-supercritical pressures; the effect being more pronounced at lower SC temperatures, even at cryogenic temperatures in contrast to SC CO 2 (T c = 30.98°C) and water.

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Section: Nonreacting and Noncorrodingmentioning

confidence: 99%

Existence of Supercritical "Liquid-Like" State in Subcritical Region, Optimal Heat Transfer Enhancement, and Argon as a Nonreacting, Noncorroding Sc Heat Transfer Fluid

2022

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“…Therefore, the above alloy materials are prone to oxidization and corrosion, resulting in a sharp decrease in the reactor service life. Therefore, it is particularly important to explore advanced reactor materials for the process of supercritical water oxidation [ 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Sol–Gel-Derived Ni3Al Coating on Nickel Alloy for Oxidation Resistance in Supercritical Water Environments

et al. 2022

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Although nickel-based alloys are widely used in industries due to their oxidation and corrosion resistance, the pursuit of better performance in harsh environments is still a great challenge. In this work, we developed a sol–gel method to synthesize Ni3Al coating on a nickel alloy, assisted by a post-annealing process, and investigated the oxidation-resistant performance. The coating thickness can be controlled by designing the deposition times, which keep the pure Ni3Al phase stable. In addition, the surface morphologies indicate that the coating is compact without obvious voids or cracks. Furthermore, the oxidation-resistant property of the coating was investigated by carrying out a supercritical water oxidation experiment. The crystalline structure and surface morphology of the samples before and after 72-h oxidation demonstrated the superior oxidation resistance of the coating. This work provides a convenient method to fabricate an oxidation-resistant coating on a nickel-based alloy, which would be significant for prolonging the service life of vessels under oxidation conditions, especially for supercritical water reactions.

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“…13 The stagnant microenvironment existing between the deposited-salt layer and the inner reactor wall can result in severe corrosion. 14 In order to prolong the service life of the SCWO reactor, researchers have developed a variety of corrosion control techniques to reduce the corrosion rate of the reactor material, 15 including the use of highly corrosion-resistant material, liners, coatings, transpiring wall reactors, adsorption/reaction on the fluidized solid phase, vortex/circulating flow reactors, preneutralization, and the optimization of process operating conditions, etc., 14 while the selection of material with high corrosion resistance is the most common method. Although no one material can withstand corrosion in all systems, some materials can meet the corrosion resistance requirement under certain SCWO conditions for a considerable period of time.…”

Section: Introductionmentioning

confidence: 99%

“…Guzonas et al 26 reported the effect of changes in SCW density on corrosion mechanism and emphasized the close relationship between SCW corrosion and high-temperature steam above 500 °C. Presently, Tang et al 15 described the corrosion characteristics of Fe-based alloys, Ni-based alloys, Ti-based alloys, ceramics, niobium, tantalum, niobium, and gold under SCWO conditions. This paper presents a comprehensive literature review of corrosion characteristics of typical Ni-based alloys in subcritical and supercritical water environments.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Characteristics of Typical Ni–Cr Alloys and Ni–Cr–Mo Alloys in Supercritical Water: A Review

Guo

et al. 2020

Ind. Eng. Chem. Res.

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The corrosion of supercritical water system materials under high-temperature and high-pressure conditions exists widely, which may result in the serious damage of the supercritical water reactor. Therefore, the improvement of the corrosion resistance of reactor material is important for ensuring the serviceability of the supercritical water reactor. This article provides a comprehensive and updated review on the corrosion characteristics of Ni−Cr and Ni−Cr−Mo corrosion-resistant alloys in supercritical water, such as the corrosion weight change, the structure, and the composition of oxide film. The influence of key parameters on the corrosion behavior of Ni-based alloys, and comparisons of corrosion resistance of typical Ni-based alloys in supercritical water, are also involved. In most cases, the corrosion weight change of different Ni−Cr−Mo alloys exposed to supercritical water (SCW) is reflected by weight gain, and first increases and then decreases with increasing exposure time over a wide range of time. The inner oxide layer is formed by the transport of anions, or conversely, of oxygen vacancies, while the outer layer is formed by the diffusion of cations but continuously dissolved. Furthermore, high temperature promotes alloy oxidation in SCW or enlarges oxide particles, thereby increasing thermal stress and eventually inducing corrosion layer exfoliation.

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Corrosion Properties of Candidate Materials in Supercritical Water Oxidation Process

Cited by 10 publications

References 63 publications

Existence of Supercritical "Liquid-Like" State in Subcritical Region, Optimal Heat Transfer Enhancement, and Argon as a Nonreacting, Noncorroding Sc Heat Transfer Fluid

Existence of Supercritical "Liquid-Like" State in Subcritical Region, Optimal Heat Transfer Enhancement, and Argon as a Nonreacting, Noncorroding Sc Heat Transfer Fluid

Sol–Gel-Derived Ni3Al Coating on Nickel Alloy for Oxidation Resistance in Supercritical Water Environments

Corrosion Characteristics of Typical Ni–Cr Alloys and Ni–Cr–Mo Alloys in Supercritical Water: A Review

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