Corrosion phenomena of alloys by subcritical and supercritical water oxidation of 2-chlorophenol

Son, Sang Ha; Lee, Jae Hyuk; Lee, Chang Ha

doi:10.1016/j.supflu.2007.09.027

Cited by 41 publications

(23 citation statements)

References 24 publications

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“…It is known that the high temperature subcritical water has higher corrosive and solubility than supercritical water. Alloys always get a higher corrosion rate at subcritical condition than supercritical condition and the higher destruction efficiency of organic matter at subcritical condition because of the more dissolved catalytic alloying elements by severe corrosion (16,29,(39)(40)(41)(42)(43)(44)(45)(46)(47)(48). The high pressure 60 MPa could cause intergranular corrosion and higher corrosion rate than 25 MPa by more than two orders of magnitude, indicating the importance of density of water on corrosion behavior of alloys (49).…”

Section: Corrosion Results Of Candidate Materialsmentioning

confidence: 99%

“…Corrosion of Gr2 became severe and Gr12 showed a low corrosion rate among candidate titanium based alloys in the presence of sulfate or phosphate (67). The titanium Gr2 showed more resistance to corrosion than other alloys (such as Inconel 600, Hastelloy C-276, Monel 400, 316 SS and Zirconium 702) in the SCWO process for decomposing halogenated compounds (26,45,68). The titanium displayed more resistance to corrosion than 304 SS in high temperature subcritical solution with HCl (76).…”

Section: Titanium Based Alloymentioning

confidence: 94%

“…However, the acidic solution would lead to NiO instability in high temperature (58,63). The most mass reduction and the most severe morphological change were both observed under subcritical condition (29,30,45,64,65). In contrast to 304L SS, 316L SS and Inconel 690, the oxide on Inconel 625 is too thin to measure in deaerated supercritical water over the temperature range 400 °C to 550 °C (36).…”

Section: Nickel Based Alloymentioning

confidence: 97%

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Corrosion Properties of Candidate Materials in Supercritical Water Oxidation Process

Tang

Wang

Qian

et al. 2016

Journal of Advanced Oxidation Technologies

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Abstract:Corrosion of constructional materials in supercritical water oxidation (SCWO) is one of the main obstacles to commercializing the SCWO process. Statistical analysis of corrosion research results indicate nickel-based alloys are the most widely applied materials in SCWO system among the candidate metals. The present paper reviews the corrosion characteristics of iron-base alloy, nickel-based alloy, titanium-base alloy, ceramics, niobium, tantalum, thallium and gold under the condition of SCWO. The selection scheme of materials is presented in SCWO system flow diagram in detail. The effects of alloying elements on the corrosion behavior of materials in the water environment with high temperature and high pressure water are summarized in this paper. Moreover, some further researches for material corrosion in SCWO process are also proposed. All work was contributed to selecting the appropriate constructional materials and reducing the corrosion damage in SCWO system.

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Section: Corrosion Results Of Candidate Materialsmentioning

confidence: 99%

Section: Titanium Based Alloymentioning

confidence: 94%

Section: Nickel Based Alloymentioning

confidence: 97%

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Corrosion Properties of Candidate Materials in Supercritical Water Oxidation Process

Tang

Wang

Qian

et al. 2016

Journal of Advanced Oxidation Technologies

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“…On the other hand, heterogeneous catalysis is only suitable for use with homogeneous wastewaters, since the catalysis shouldn't be expected without maintaining contact between the inner catalyst surfaces and organic pollutants. Even though corrosion is an unwanted phenomenon, its products such as metal oxides and ions increase the SCWO efficiency as catalysts [56].…”

Section: Catalyst Usementioning

confidence: 99%

Supercritical Water Oxidation (SCWO) for Wastewater Treatment

Akgün

Söğüt

2014

Biofuels and Biorefineries

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Water behaves as an acidic and alkaline precursor for acidic or basic reactions, since the formation of both H 3 O C and OH -ions takes place in accordance with the self-dissociation of water at near-critical and above supercritical (T c D 374 ı C, P c D 22.1 MPa) conditions. Therefore, supercritical water is considered both as a solvent for organic materials and as a reactant at processes such as the oxidative treatment of wastewaters, the gasification of aqueous organic solutions and the production of fine metal oxide particles. Supercritical water oxidation is a very efficient method for wastewater treatment, which is based on oxidation of organic compounds in aqueous media above critical temperature and pressure conditions of pure water.In this chapter, general information on supercritical water oxidation processes is given, effects of operational parameters such as temperature, pressure, reaction time, waste and oxidant concentration on waste treatment are discussed, and applied scientific methods and practical solutions to possible operational problems such as corrosion, salt deposition and carbonization are compiled in detail. Treatment of industrial wastewaters such as olive mill, textile dyehouse, cheese whey and commercial pesticide with high environmental hazard potential are subjected and evaluated in order to understand the effects of reactor temperature, organics and oxidant concentrations, residence time and reactor pressure. Hydrothermal degradation and oxidation kinetics of wastewater are stracked in terms of total organic carbon (TOC) and analyzed, followed by discussion of supercritical water oxidation rate models.

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“…The localized corrosion (e.g. pitting corrosion and stress corrosion cracking) is commonly known for chloride, and bromide [12][13][14]. However, Several anions, such as phosphate [15], can be incorporated in the oxide layer of nickel-based alloys and lead to their increased stability because of secondary passivation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sulfides on the Corrosion Behavior of Inconel 600 and Incoloy 825 in Supercritical Water

Wang

Tang

et al. 2015

Oxid Met

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Corrosion tests of Inconel 600 and Incoloy 825 were performed in supercritical water containing sulfides at 520°C and 25 MPa. The scales formed on Inconel 600 consisted of a thick outer layer of almost pure Ni 3 S 2 and an inner layer predominantly of Cr-rich spinels with a Ni 3 S 2 network inside. The scales of Incoloy 825 also had a multilayered structure. The outer layer primarily consisted of Ni 3 S 2 and (Ni,Fe) 3 S 4, followed by a thicker intermediate mixture layer of chromium-rich oxides, Ni 3 S 2, and (Ni,Fe) 3 S 4 , an inner layer of predominantly Cr 2 O 3 and a small amount of Ni 3 S 2 toward the substrate. Incoloy 825 showed slightly better corrosion resistance than Inconel 600 due to its higher Cr content. By means of superimposed isothermal phase diagrams and evaluation for the partial pressures of oxygen and sulfur in the designated atmosphere, the corresponding corrosion mechanisms were discussed, based on the present investigation.

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Corrosion phenomena of alloys by subcritical and supercritical water oxidation of 2-chlorophenol

Cited by 41 publications

References 24 publications

Corrosion Properties of Candidate Materials in Supercritical Water Oxidation Process

Corrosion Properties of Candidate Materials in Supercritical Water Oxidation Process

Supercritical Water Oxidation (SCWO) for Wastewater Treatment

Effects of Sulfides on the Corrosion Behavior of Inconel 600 and Incoloy 825 in Supercritical Water

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