Corrosion of alloy 690 in simulated steam generator chemistry with boiling-effect of chloride and sulfate impurities

Konsta Sipilä; Tiina Ikäläinen; Tiina Lavonen; Timo Saario; Caitlin Huotilainen; Iva Betova; Martin Bojinov

doi:10.1016/j.electacta.2023.142129

Corrosion of alloy 690 in simulated steam generator chemistry with boiling-effect of chloride and sulfate impurities

Konsta Sipilä, Tiina Ikäläinen, Tiina Lavonen, Timo Saario, Caitlin Huotilainen, Iva Betova, Martin Bojinov (Corresponding Author)

BA4509 Advanced materials for nuclear energy

Research output: Contribution to journal › Article › Scientific › peer-review

3 Citations (Scopus)

Abstract

Enrichment of impurities occurs in steam generators of nuclear plants due to intense boiling conditions prevailing within them. In this work, deposition and release of chloride and sulfate impurities were studied using a dedicated water circulation loop with Alloy 690 as steam generator tubing. Electrochemical impedance spectroscopy was employed to follow in-situ the corrosion behavior in non-boiling, boiling and after-boiling conditions. Deposition/release of impurities is quasi-first-order vs. concentration. Interpretation of electrochemical impedance data using an updated version of the Mixed-Conduction Model allows to obtain reaction orders of oxide growth and corrosion release with respect to chloride and sulfate additives.

Original language	English
Article number	142129
Journal	Electrochimica Acta
Volume	447
DOIs	https://doi.org/10.1016/j.electacta.2023.142129
Publication status	Published - 10 Apr 2023
MoE publication type	A1 Journal article-refereed

Keywords

Corrosion mechanism
Impurity deposition/release
Nickel-base alloy
Secondary coolant
Sub-nucleate boiling

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10.1016/j.electacta.2023.142129

Cite this

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title = "Corrosion of alloy 690 in simulated steam generator chemistry with boiling-effect of chloride and sulfate impurities",

abstract = "Enrichment of impurities occurs in steam generators of nuclear plants due to intense boiling conditions prevailing within them. In this work, deposition and release of chloride and sulfate impurities were studied using a dedicated water circulation loop with Alloy 690 as steam generator tubing. Electrochemical impedance spectroscopy was employed to follow in-situ the corrosion behavior in non-boiling, boiling and after-boiling conditions. Deposition/release of impurities is quasi-first-order vs. concentration. Interpretation of electrochemical impedance data using an updated version of the Mixed-Conduction Model allows to obtain reaction orders of oxide growth and corrosion release with respect to chloride and sulfate additives.",

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AU - Sipilä, Konsta

AU - Ikäläinen, Tiina

AU - Lavonen, Tiina

AU - Saario, Timo

AU - Huotilainen, Caitlin

AU - Betova, Iva

AU - Bojinov, Martin

N1 - Funding Information: The funding of this work by the Finnish Ministry of Economic Affairs and Employment within the frames of the SAFIR 2022 Finnish Research Program on Nuclear Power Plant Safety (2019–2022) is gratefully acknowledged. Publisher Copyright: © 2023

PY - 2023/4/10

Y1 - 2023/4/10

N2 - Enrichment of impurities occurs in steam generators of nuclear plants due to intense boiling conditions prevailing within them. In this work, deposition and release of chloride and sulfate impurities were studied using a dedicated water circulation loop with Alloy 690 as steam generator tubing. Electrochemical impedance spectroscopy was employed to follow in-situ the corrosion behavior in non-boiling, boiling and after-boiling conditions. Deposition/release of impurities is quasi-first-order vs. concentration. Interpretation of electrochemical impedance data using an updated version of the Mixed-Conduction Model allows to obtain reaction orders of oxide growth and corrosion release with respect to chloride and sulfate additives.

AB - Enrichment of impurities occurs in steam generators of nuclear plants due to intense boiling conditions prevailing within them. In this work, deposition and release of chloride and sulfate impurities were studied using a dedicated water circulation loop with Alloy 690 as steam generator tubing. Electrochemical impedance spectroscopy was employed to follow in-situ the corrosion behavior in non-boiling, boiling and after-boiling conditions. Deposition/release of impurities is quasi-first-order vs. concentration. Interpretation of electrochemical impedance data using an updated version of the Mixed-Conduction Model allows to obtain reaction orders of oxide growth and corrosion release with respect to chloride and sulfate additives.

KW - Corrosion mechanism

KW - Impurity deposition/release

KW - Nickel-base alloy

KW - Secondary coolant

KW - Sub-nucleate boiling

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U2 - 10.1016/j.electacta.2023.142129

DO - 10.1016/j.electacta.2023.142129

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SN - 0013-4686

VL - 447

JO - Electrochimica Acta

JF - Electrochimica Acta

M1 - 142129

ER -

Corrosion of alloy 690 in simulated steam generator chemistry with boiling-effect of chloride and sulfate impurities

Abstract

Keywords

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