Investigation into the effect of water chemistry on corrosion product formation in areas of accelerated flow

McGrady, John; Scenini, Fabio; Duff, Jonathan; Stevens, Nicholas; Cassineri, Stefano; Curioni, Michele; Banks, Andrew

doi:10.1016/j.jnucmat.2017.06.030

Cited by 26 publications

(5 citation statements)

References 23 publications

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“…For the interface between the 304 SS and the solution to remain neutral, the charge held onto the 304 SS was balanced by the redistribution of ions of opposite charge in the solution close to the 304 SS, leading to an EDL shown in Figure 11a [28,29]. When the solution flows into flow cell I, the flow acceleration area forms in it, resulting in the rapid increase of streaming current, and then the transfer of wall current generated from the 304 SS to the metal/solution interface [15,16,22,30]. In the meantime, the "Karman vortex street" phenomenon will occur in the flow accelerated region, making the pressure difference between the micro-orifice on both sides increase, and causing a new current loop to promote particle deposition [19,[31][32][33][34].…”

Section: Deposition Mechanismsmentioning

confidence: 99%

“…Post-test analysis of the deposit showed that both crystalline and particulate species were found, suggesting more than one mechanism of clogging was present. In another study [16], the research team investigated the effects of the local environment including flow velocity, material, and Fe concentration on clogging. It has been proved that higher Fe concentrations in solution facilitated clogging within the orifice whereas an increased flow velocity reduced clogging.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Characterization of the Corrosion Product Deposit in the Flow-Accelerated Region in High-Temperature Water

Zhang

et al. 2022

Crystals

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The clogging behavior of the micro-orifice under a flow accelerated condition was investigated after 500 h of immersion in high-temperature water. The results indicated the residual area of the micro-orifice was reduced to one-third of its original size after 500 h of immersion due to the deposition of corrosion products. In this process, the clogging behavior of micro-orifice can be divided into three stages: the stable deposition stage, the quick recovery stage, and the dynamic equilibrium stage. The corrosion products were porous and consisted of many deposited particles. The process of particle deposition and removal was carried out simultaneously.

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Section: Deposition Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of the Corrosion Product Deposit in the Flow-Accelerated Region in High-Temperature Water

Zhang

et al. 2022

Crystals

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“…More details about the flow cell employed can be found in references. [27][28][29]37 CRUD deposition was analysed in terms of the change in diameter of the micro-orifice, as well as the pressure drop across the orifice caused by CRUD build-up.…”

Section: High-temperature Autoclavementioning

confidence: 99%

Development of a microfluidic setup to study the corrosion product deposition in accelerated flow regions

et al. 2017

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CRUD (Chalk River Unidentified Deposit) forms in the water circuits of nuclear reactors due to corrosion of structural materials and the consequent release of species into the coolant. The deposition of CRUD is known to occur preferentially in regions of the primary circuit of pressurised water reactors (PWRs) where the water flow accelerates. In order to investigate this phenomenon, a micro-fluidic system, recreating plant conditions while using a simplified experimental set-up, was realised. A flow cell, comprising a stainless steel disc with a central micro-orifice, was used to create accelerated flow under representative operating conditions. By monitoring the pressure drop across the cell, the build-up rate (BUR) of CRUD within the micro-orifice was monitored in real time. By this setup, the conditions inducing deposition of CRUD under PWR conditions were emulated and CRUD deposition was induced in the accelerated flow region. Further effects associated with the presence of lithium hydroxide were investigated in real-time.

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“…The secondary heat exchange surface of steam generator (SG) in pressurized water reactor (PWR) of nuclear power plant (NPP) is easy to fouling, making the wing hole being gradually blocked by corrosion products [1]. The fouling phenomenon in SG secondary circuit was first found in Chalk River [2,3]. The blocking phenomenon reduces the flow rate of the fluid passing through the supporting plate, and also increases the pressure drop, hinders the liquid passing through the secondary circuit, and reduces the heat exchange efficiency of SG [4].…”

Section: Introductionmentioning

confidence: 99%

DFT study of the fouling deposition process in the steam generator by simulating the absorption of Fe2+ on Fe3O4 (001) 

Pan¹,

Lu²,

Xu³

et al. 2021

Preprint

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In this paper, the interaction between free Fe2+ and Fe3O4 corrosion products on the pipe surface in the secondary circuit of PWR nuclear power plant was studied, and the reason of agglomeration formation was analyzed. The complex physical and chemical interaction was simplified by describing the electron interaction. Based on the first principles, CASTEP was used to simulate seven kinds of highly symmetric adsorption structure models of Fetet1 and Feoct1 on Fe3O4 (001) surface, and their adsorption energies and stable adsorption conformations were calculated. The results show that the most stable adsorption structures of the Fe2+/Fe3O4 (001) configurations are Feoct1-b and Fetet1-Oh. During the adsorption, the Fe-Fe, Fe-O bond length and Fe-Fe-O bond angle of (001) surface changed, and the atomic positions parallel and perpendicular to (001) surface changed correspondingly, the surface layer changes the most. The results prove that the adsorption has great effect on the physical structure of Fe2+ and Fe3O4 (001). The calculation of charge population, the density of states and electron local function of Fe2+/Fe3O4 (001) optimal adsorption configuration also shows that there is electron transfer between Fe2+ and Fe3O4 (001), and the adsorption type is chemisorption. Among them, Fe (Fe2+)-Fe (Fe3O4) forms a metal bond, and Fe (Fe2+)-O (Fe3O4) forms the ionic bond.

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Investigation into the effect of water chemistry on corrosion product formation in areas of accelerated flow

Cited by 26 publications

References 23 publications

Microstructural Characterization of the Corrosion Product Deposit in the Flow-Accelerated Region in High-Temperature Water

Microstructural Characterization of the Corrosion Product Deposit in the Flow-Accelerated Region in High-Temperature Water

Development of a microfluidic setup to study the corrosion product deposition in accelerated flow regions

DFT study of the fouling deposition process in the steam generator by simulating the absorption of Fe2+ on Fe3O4 (001)

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Investigation into the effect of water chemistry on corrosion product formation in areas of accelerated flow

Cited by 26 publications

References 23 publications

Microstructural Characterization of the Corrosion Product Deposit in the Flow-Accelerated Region in High-Temperature Water

Microstructural Characterization of the Corrosion Product Deposit in the Flow-Accelerated Region in High-Temperature Water

Development of a microfluidic setup to study the corrosion product deposition in accelerated flow regions

DFT study of the fouling deposition process in the steam generator by simulating the absorption of Fe2+ on Fe3O4 (001)&nbsp;

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DFT study of the fouling deposition process in the steam generator by simulating the absorption of Fe2+ on Fe3O4 (001)