Corrosion and deposition on the secondary circuit of steam generators

Xie, Yi; Zhang, Jinsuo

doi:10.1080/00223131.2016.1152923

Cited by 20 publications

(7 citation statements)

References 42 publications

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“…Xie and Zhang [20] reviewed the corrosion and deposition on the secondary circuit of steam generators and pointed out the structure of fouling on the SG tube can be classified into three layers, namely, inner layer (corrosion layer, which is formed by the diffusion of elements and the combination with oxygen atoms), outer layer, and deposition layer. This agrees well with the current observation, as shown in Figures 3, 4, 7 and 8.…”

Section: Discussionmentioning

confidence: 99%

The Fouling Behavior of Steam Generator Tube at Different Positions in the High-Temperature Water

Zhang

Qiu

et al. 2021

Metals

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The fouling behavior of a steam generator (SG) tube was investigated at different positions after 500 h of immersion in high-temperature water. A triple-layer structure of fouling appeared at both the crevice position and the free span position, namely, the large, dispersedly distributed deposition layer on the top; the small and faceted outer layer; and the relatively continuous inner layer. There was no obvious positional effect on the thickness of the inner layer. However, in the crevice position, the density of the deposited particle and the thickness of the outer layer was much higher than those of the free span position. The tube support plate (TSP) made of 410 stainless steel contributed significantly to the fouling behavior of the SG tube in the crevice between the SG tube and the TSP.

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Section: Discussionmentioning

confidence: 99%

The Fouling Behavior of Steam Generator Tube at Different Positions in the High-Temperature Water

Zhang

Qiu

et al. 2021

Metals

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“…The influence of flow rate on the corrosion behavior can be roughly divided into three regions, as shown in Figure 13 (Satoh et al , 2007; Xie and Zhang, 2016; Li et al , 2018). At the small flow rate condition, the fluid, Reynolds number of which is small, is in a laminar state.…”

Section: Discussionmentioning

confidence: 99%

Corrosion behavior of WB36CN1 steel at different flow rates

Song

Gao

Liu

et al. 2020

ACMM

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Purpose This paper aims to study the effect of flow rate (0.42∼2.09 m/s) on the corrosion behavior of WB36CN1 steel pipe in the simulated secondary circuit water environment (170°C, 6 mg/L ethanolamine + 100 µg/L NaCl), for which an autoclave was used to simulate the secondary circuit environment for carrying out related experiments. Design/methodology/approach The corrosion behaviors were studied by electrochemical methods, morphological observations and elemental analysis. Findings As flow rate increases, the amplitude of the current noise fluctuates increased, noise resistance Rn and spectral noise resistance Rsn decreased, the shear stress on the surface of WB36CN1 steel increases, the oxygen content on the surface decreases, the roughness becomes smaller. Meanwhile, the energy of energy distribution plot is concentrated at high frequencies under the three flow conditions, the slopes of current power spectral density curve approach 0 db/decade. This means that the oxide on the surface becomes less and corrosion rate increases with increasing flow rate. The corrosion type of WB36CN1 steel was uniform corrosion; the degree of uniform corrosion is higher at high flow rate. Originality/value The effect of flow rate on the corrosion behavior of WB36CN1 steel pipe in the secondary circuit water environment was studied by using electrochemical methods in the laboratory. The effect mechanism of flow rate for corrosion behavior was obtained.

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“…The kinetics of magnetite deposition on stainless steel (SG tube material) were investigated in the temperature interval 130-180 • C using a laboratory made recirculation loop connected to a measurement autoclave ((PARR, USA, manufactured from AISI 316L, volume 3.75 dm 3 , Figure 2). The temperature interval was chosen to coincide with the reported maximum flow-assisted corrosion rates in the steam generator.…”

Section: Methodsmentioning

confidence: 99%

“…These particles are carried by the stream and deposited on the supports of the tube bundles or the pre-heater cartridges, creating problems associated with flow continuity, thermohydraulic properties and corrosion. Recent accidents of pipe bundles in PWR plants are described as the result of high-frequency fatigue associated with flow redistribution and the clogging of pipes due to a violation of the structure of the supports of the SG tube bundles [2][3][4]. Modern corrosion problems include intercrystallite corrosion and stress corrosion cracking at the low levels of the steam generator pipes in Canadian Deuterium-Uranium (CANDU) reactors, as well as pitting corrosion in some PWR plants [1][2][3][4].…”

mentioning

confidence: 99%

Deposition of Colloidal Magnetite on Stainless Steel in Simulated Steam Generator Conditions—Experiments and Modeling

Betova

Bojinov

Karastoyanov

2022

Colloids and Interfaces

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Sludge formation via colloidal magnetite deposition in steam generators is an important phenomenon that significantly influences the thermohydraulic properties and corrosion of structural materials. This paper aims to verify a model of sludge deposition and consolidation with emphasis on its most significant parameters and their experimental estimation. In-situ electrochemical impedance spectroscopic (EIS) measurements are employed for quantitative evaluation of magnetite deposition kinetics on stainless steel in ammonia-ethanolamine (AMETA) secondary coolant at different temperatures. Parameterization of the model by quantitative comparison of the mixed-conduction model (MCM) with experimental data is discussed. Model predictions are compared with literature data from laboratory experiments and plant operation. Conclusions are drawn about the applicability of the model for quantitative assessment of sludge deposition and consolidation rates.

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Corrosion and deposition on the secondary circuit of steam generators

Cited by 20 publications

References 42 publications

The Fouling Behavior of Steam Generator Tube at Different Positions in the High-Temperature Water

The Fouling Behavior of Steam Generator Tube at Different Positions in the High-Temperature Water

Corrosion behavior of WB36CN1 steel at different flow rates

Deposition of Colloidal Magnetite on Stainless Steel in Simulated Steam Generator Conditions—Experiments and Modeling

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