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Effects of Different Ions and Temperature on Corrosion Behavior of Pure Iron in Anoxic Simulated Groundwater

As a typical material of the insert in high-level radioactive waste (HLW) geological disposal canisters, iron-based materials will directly contact with groundwater after the failure of a metallic canister, acting as a chemical barrier to prevent HLW leaking into groundwater. In this paper, anoxic g...

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Autores principales: Li, Teng, Huang, Guokai, Feng, Yanpeng, Yang, Miao, Wang, Lingyu, Cui, Daqing, Zhang, Xian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7345544/
https://www.ncbi.nlm.nih.gov/pubmed/32549205
http://dx.doi.org/10.3390/ma13122713
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author Li, Teng
Huang, Guokai
Feng, Yanpeng
Yang, Miao
Wang, Lingyu
Cui, Daqing
Zhang, Xian
author_facet Li, Teng
Huang, Guokai
Feng, Yanpeng
Yang, Miao
Wang, Lingyu
Cui, Daqing
Zhang, Xian
author_sort Li, Teng
collection PubMed
description As a typical material of the insert in high-level radioactive waste (HLW) geological disposal canisters, iron-based materials will directly contact with groundwater after the failure of a metallic canister, acting as a chemical barrier to prevent HLW leaking into groundwater. In this paper, anoxic groundwater was simulated by mixing 10 mM NaCl and 2 mM NaHCO(3) purged by Ar gas (containing 0.3% CO(2)) with different added ions (Ca(2+), CO(3)(2−) and SiO(3)(2−)) and operation temperatures (25, 40 and 60 °C). An electrochemical measurement, immersion tests and surface characterization were carried out to study the corrosion behavior of pure iron in the simulated groundwater. The effects of Ca(2+) on the corrosion behavior of iron is negligible, however, Cl(−) plays an important role in accelerating the corrosion activity with the increased concentration and temperature. With increased concentrations of CO(3)(2−) and SiO(3)(2−), the corrosion resistance of iron is largely improved, which is attributed to the formation of a uniform passivation film. The independent effects of temperature on the corrosion behavior of iron are resulted from the repeated passivation–dissolution processes in the formation of the passivation film, resulting from the synergistic effects of CO(3)(2−)/SiO(3)(2−) and Cl(−). The formation of ferric silicate is dominant in the passivation film with the addition of SiO(3)(2−), which effectively protects the iron surface from corrosion.
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spelling pubmed-73455442020-07-09 Effects of Different Ions and Temperature on Corrosion Behavior of Pure Iron in Anoxic Simulated Groundwater Li, Teng Huang, Guokai Feng, Yanpeng Yang, Miao Wang, Lingyu Cui, Daqing Zhang, Xian Materials (Basel) Article As a typical material of the insert in high-level radioactive waste (HLW) geological disposal canisters, iron-based materials will directly contact with groundwater after the failure of a metallic canister, acting as a chemical barrier to prevent HLW leaking into groundwater. In this paper, anoxic groundwater was simulated by mixing 10 mM NaCl and 2 mM NaHCO(3) purged by Ar gas (containing 0.3% CO(2)) with different added ions (Ca(2+), CO(3)(2−) and SiO(3)(2−)) and operation temperatures (25, 40 and 60 °C). An electrochemical measurement, immersion tests and surface characterization were carried out to study the corrosion behavior of pure iron in the simulated groundwater. The effects of Ca(2+) on the corrosion behavior of iron is negligible, however, Cl(−) plays an important role in accelerating the corrosion activity with the increased concentration and temperature. With increased concentrations of CO(3)(2−) and SiO(3)(2−), the corrosion resistance of iron is largely improved, which is attributed to the formation of a uniform passivation film. The independent effects of temperature on the corrosion behavior of iron are resulted from the repeated passivation–dissolution processes in the formation of the passivation film, resulting from the synergistic effects of CO(3)(2−)/SiO(3)(2−) and Cl(−). The formation of ferric silicate is dominant in the passivation film with the addition of SiO(3)(2−), which effectively protects the iron surface from corrosion. MDPI 2020-06-15 /pmc/articles/PMC7345544/ /pubmed/32549205 http://dx.doi.org/10.3390/ma13122713 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Teng
Huang, Guokai
Feng, Yanpeng
Yang, Miao
Wang, Lingyu
Cui, Daqing
Zhang, Xian
Effects of Different Ions and Temperature on Corrosion Behavior of Pure Iron in Anoxic Simulated Groundwater
title Effects of Different Ions and Temperature on Corrosion Behavior of Pure Iron in Anoxic Simulated Groundwater
title_full Effects of Different Ions and Temperature on Corrosion Behavior of Pure Iron in Anoxic Simulated Groundwater
title_fullStr Effects of Different Ions and Temperature on Corrosion Behavior of Pure Iron in Anoxic Simulated Groundwater
title_full_unstemmed Effects of Different Ions and Temperature on Corrosion Behavior of Pure Iron in Anoxic Simulated Groundwater
title_short Effects of Different Ions and Temperature on Corrosion Behavior of Pure Iron in Anoxic Simulated Groundwater
title_sort effects of different ions and temperature on corrosion behavior of pure iron in anoxic simulated groundwater
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7345544/
https://www.ncbi.nlm.nih.gov/pubmed/32549205
http://dx.doi.org/10.3390/ma13122713
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