Flow-Accelerated Corrosion Wear of Power-Generating Equipment: Investigations, Prediction, and Prevention: 1. Flow-Accelerated Corrosion Processes and Regularities

Tomarov, G. V.; Shipkov, A. A.

doi:10.1134/s0040601518080062

Cited by 16 publications

(8 citation statements)

References 5 publications

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“…Moreover, the maximum corrosion current density appears at the outermost side of the tested elbow, consistent with previous reports. [15,31] In addition, Ting et al [12] inspected the 2,000 components in the Taiwan PWR, Maanshan Nuclear Power Plant Units 1 and 2 by ultrasonic testing per scheduled outage and 70% of all inspected elbows also presented that the maximum FAC rate appears at the outermost side due to the change of flow direction.…”

Section: Experimental Results Under Different Velocitymentioning

confidence: 99%

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Investigation of corrosion behavior at elbow by array electrode and computational fluid dynamics simulation

et al. 2020

Materials & Corrosion

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The present study focuses on the flow-accelerated corrosion (FAC) behavior of A106Gr.B steel at 90°elbow by electrochemical measurement and computational fluid dynamics (CFD) simulation. The FAC rates under turbulent flows with a velocity of 3 and 1.5 m/s were measured by an array electrode technique in a loop system. The experimental results reveal that the maximum FAC rate appears at the extrados of 90°elbow, consistent with the locations from the rupture of the carbon steel piping in the worst cases at elbows. In addition, an effective mass transfer coefficient in consideration of the geometric factor was used to evaluate the FAC rate at intrados and extrados of the 90°elbow by CFD simulation. The predicted results are in good agreement with the experimental values.

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Section: Experimental Results Under Different Velocitymentioning

confidence: 99%

“…The surface activation reaction controls the formation rate of soluble species Fe 2+ , and the FAC rate determined by the electrochemical reaction is given as follows [31] :…”

Section: Establishment Of the Fac Modelmentioning

confidence: 99%

Investigation of corrosion behavior at elbow by array electrode and computational fluid dynamics simulation

et al. 2020

Materials & Corrosion

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“…According to Tomarov et al [21], FAC damage can be classified into two distinct types: general flow-accelerated corrosion (GFAC) and local flow-accelerated corrosion (LFAC). GFAC, observed in most instances, is characterized by a moderate metal thinning rate that typically does not result in sudden failures or pinholes compromising the circuit's integrity.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fusion Boundary Microstructure on Flow-Accelerated Corrosion Cracking

Wang,

Lyu,

et al. 2024

Materials

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Flow-accelerated corrosion (FAC) preferentially attacks the downstream heat-affected zone of the root-pass weld in steam pipe systems. A detailed characterization identifies the fusion boundary as the initiation location for the attack. Alloying elements are found depleted along the weld fusion boundary, and multiple welding thermal cycles and repetitive austenite-to-ferrite phase transformations result in an increased proportion of grains with Goss {110}<001> texture along the fusion boundary. The synergistic effects of chemical segregation and the Schmid factor may contribute to the preferential initiation of FAC cracks along the root weld fusion boundary, making it the weakest link for FAC attack in steam pipe girth welds.

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“…Flow-accelerated or flow-assisted corrosion (FAC), also denoted as erosion-corrosion, of carbon or low-alloyed steel piping, occurs when the rate of dissolution of the protective oxide film that forms on the internal piping surface into a stream of flowing water or wet steam is enhanced, leading to an increased wall thinning rate [1][2][3][4][5][6][7][8][9]. This phenomenon is encountered in both single and two-phase flow conditions and is the result of an increase in the rate of corrosion or material dissolution, induced by the relative movement between a corrosive fluid and a material surface; thus it does not involve erosion or cavitation damage.…”

Section: Introductionmentioning

confidence: 99%

Flow-Assisted Corrosion of Carbon Steel in Simulated Nuclear Plant Steam Generator Conditions

2023

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Flow-assisted corrosion occurs via increased dissolution and/or mechanical degradation of protective oxide formed on the surface of construction materials in direct contact with coolant liquids. In the present paper, this phenomenon is studied on carbon steel in an ammonia-ethanolamine-hydrazine electrolyte by in situ electrochemical impedance spectroscopy in conditions that closely simulate those that prevail in nuclear plant steam generators. Based on the obtained results, a quantitative kinetic model of the process is proposed and parameterized by nonlinear regression of experimental data to the respective transfer function. On the basis of the experimental and calculational results, it is concluded that flow-assisted corrosion of carbon steel is limited by oxide dissolution and cation ejection processes and the protective layer–coolant interface. Expressions for the film growth and corrosion release processes are proposed and successfully compared to operational data.

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Flow-Accelerated Corrosion Wear of Power-Generating Equipment: Investigations, Prediction, and Prevention: 1. Flow-Accelerated Corrosion Processes and Regularities

Cited by 16 publications

References 5 publications

Investigation of corrosion behavior at elbow by array electrode and computational fluid dynamics simulation

Investigation of corrosion behavior at elbow by array electrode and computational fluid dynamics simulation

Effect of Fusion Boundary Microstructure on Flow-Accelerated Corrosion Cracking

Flow-Assisted Corrosion of Carbon Steel in Simulated Nuclear Plant Steam Generator Conditions

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