Decomposition products of oxygen scavengers and their effect on corrosion of steam generator materials – I. Diethyl-hydroxylamine and carbohydrazide

Konsta Sipilä; Pedro Ferreirós; Tiina Ikäläinen; Atte Mikkelson; I. Betova; M. Bojinov

doi:10.1016/j.corsci.2024.112476

Decomposition products of oxygen scavengers and their effect on corrosion of steam generator materials – I. Diethyl-hydroxylamine and carbohydrazide

Konsta Sipilä^*
, Pedro Ferreirós
, Tiina Ikäläinen
, Atte Mikkelson
, I. Betova
, M. Bojinov

^*Corresponding author for this work

Bulgarian Academy of Sciences
University of Chemical Technology and Metallurgy

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

2 Citations (Scopus)

781 Downloads (Pure)

Abstract

Hydrazine used as oxygen scavenger in the secondary circuit of pressurized water reactors is hazardous to the environment and potentially carcinogenic, thus, suitable replacement chemicals for it are actively sought. In the present paper, decomposition products of two potential replacements – carbohydrazide and diethyl-hydroxylamine – are analyzed, and their effect on secondary water chemistry and corrosion of the main steam generator materials – carbon steel 22 K, stainless steel 0X18H10T and Alloy 690 – is studied by in-situ electrochemical techniques complemented by ex-situ analyses of the formed oxides by spectroscopic and microscopic methods. Quantitative interpretation of the electrochemical impedance data with the Mixed-Conduction Model allowed for the estimation of oxidation and corrosion release rates depending on scavenger formulation, alloy type and temperature. Conclusions on the extent of interaction of decomposition products with construction materials are drawn based on the experimental and calculational results.

Original language	English
Article number	112476
Journal	Corrosion Science
Volume	240
DOIs	https://doi.org/10.1016/j.corsci.2024.112476
Publication status	Published - 1 Nov 2024
MoE publication type	A1 Journal article-refereed

Funding

This is part of the project “Mitigation of corrosion and novel water chemistries in light water reactors” (MINERVA) within the frames of the SAFER2028 research program. The Finnish Nuclear Waste Management Fund (VYR), VTT Technical Research Centre of Finland Ltd., Fortum Power and Heat Oy and Teollisuuden Voima Oyj are greatly acknowledged for funding this work. I.B. and M.B. acknowledge funding by the National Recovery and Resilience Plan of the Republic of Bulgaria, project No. BG-RRP-2.004–0002 (BiOrgaMCT).

Keywords

Construction material corrosion
Decomposition products
Kinetic analysis
Oxygen scavengers
Steam generator

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title = "Decomposition products of oxygen scavengers and their effect on corrosion of steam generator materials {\textendash} I. Diethyl-hydroxylamine and carbohydrazide",

abstract = "Hydrazine used as oxygen scavenger in the secondary circuit of pressurized water reactors is hazardous to the environment and potentially carcinogenic, thus, suitable replacement chemicals for it are actively sought. In the present paper, decomposition products of two potential replacements {\textendash} carbohydrazide and diethyl-hydroxylamine {\textendash} are analyzed, and their effect on secondary water chemistry and corrosion of the main steam generator materials {\textendash} carbon steel 22 K, stainless steel 0X18H10T and Alloy 690 {\textendash} is studied by in-situ electrochemical techniques complemented by ex-situ analyses of the formed oxides by spectroscopic and microscopic methods. Quantitative interpretation of the electrochemical impedance data with the Mixed-Conduction Model allowed for the estimation of oxidation and corrosion release rates depending on scavenger formulation, alloy type and temperature. Conclusions on the extent of interaction of decomposition products with construction materials are drawn based on the experimental and calculational results. ",

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T1 - Decomposition products of oxygen scavengers and their effect on corrosion of steam generator materials – I. Diethyl-hydroxylamine and carbohydrazide

AU - Sipilä, Konsta

AU - Ferreirós, Pedro

AU - Ikäläinen, Tiina

AU - Mikkelson, Atte

AU - Betova, I.

AU - Bojinov, M.

PY - 2024/11/1

Y1 - 2024/11/1

N2 - Hydrazine used as oxygen scavenger in the secondary circuit of pressurized water reactors is hazardous to the environment and potentially carcinogenic, thus, suitable replacement chemicals for it are actively sought. In the present paper, decomposition products of two potential replacements – carbohydrazide and diethyl-hydroxylamine – are analyzed, and their effect on secondary water chemistry and corrosion of the main steam generator materials – carbon steel 22 K, stainless steel 0X18H10T and Alloy 690 – is studied by in-situ electrochemical techniques complemented by ex-situ analyses of the formed oxides by spectroscopic and microscopic methods. Quantitative interpretation of the electrochemical impedance data with the Mixed-Conduction Model allowed for the estimation of oxidation and corrosion release rates depending on scavenger formulation, alloy type and temperature. Conclusions on the extent of interaction of decomposition products with construction materials are drawn based on the experimental and calculational results.

AB - Hydrazine used as oxygen scavenger in the secondary circuit of pressurized water reactors is hazardous to the environment and potentially carcinogenic, thus, suitable replacement chemicals for it are actively sought. In the present paper, decomposition products of two potential replacements – carbohydrazide and diethyl-hydroxylamine – are analyzed, and their effect on secondary water chemistry and corrosion of the main steam generator materials – carbon steel 22 K, stainless steel 0X18H10T and Alloy 690 – is studied by in-situ electrochemical techniques complemented by ex-situ analyses of the formed oxides by spectroscopic and microscopic methods. Quantitative interpretation of the electrochemical impedance data with the Mixed-Conduction Model allowed for the estimation of oxidation and corrosion release rates depending on scavenger formulation, alloy type and temperature. Conclusions on the extent of interaction of decomposition products with construction materials are drawn based on the experimental and calculational results.

KW - Construction material corrosion

KW - Decomposition products

KW - Kinetic analysis

KW - Oxygen scavengers

KW - Steam generator

UR - https://www.scopus.com/pages/publications/85204924826

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DO - 10.1016/j.corsci.2024.112476

M3 - Article

SN - 0010-938X

VL - 240

JO - Corrosion Science

JF - Corrosion Science

M1 - 112476

ER -

Decomposition products of oxygen scavengers and their effect on corrosion of steam generator materials – I. Diethyl-hydroxylamine and carbohydrazide

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