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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2020-06-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/12/2713 |
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| author | Teng Li Guokai Huang Yanpeng Feng Miao Yang Lingyu Wang Daqing Cui Xian Zhang |
| author_facet | Teng Li Guokai Huang Yanpeng Feng Miao Yang Lingyu Wang Daqing Cui Xian Zhang |
| author_sort | Teng Li |
| collection | DOAJ |
| 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<sub>3</sub> purged by Ar gas (containing 0.3% CO<sub>2</sub>) with different added ions (Ca<sup>2+</sup>, CO<sub>3</sub><sup>2−</sup> and SiO<sub>3</sub><sup>2−</sup>) 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<sup>2+</sup> on the corrosion behavior of iron is negligible, however, Cl<sup>−</sup> plays an important role in accelerating the corrosion activity with the increased concentration and temperature. With increased concentrations of CO<sub>3</sub><sup>2−</sup> and SiO<sub>3</sub><sup>2−</sup>, 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<sub>3</sub><sup>2−</sup>/SiO<sub>3</sub><sup>2−</sup> and Cl<sup>−</sup>. The formation of ferric silicate is dominant in the passivation film with the addition of SiO<sub>3</sub><sup>2−</sup>, which effectively protects the iron surface from corrosion. |
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| language | English |
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| spelling | doaj.art-c850173978604473ac1da58fa95eb0eb2023-11-20T03:50:40ZengMDPI AGMaterials1996-19442020-06-011312271310.3390/ma13122713Effects of Different Ions and Temperature on Corrosion Behavior of Pure Iron in Anoxic Simulated GroundwaterTeng Li0Guokai Huang1Yanpeng Feng2Miao Yang3Lingyu Wang4Daqing Cui5Xian Zhang6Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, ChinaSchool of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, ChinaDepartment of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, ChinaDepartment of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, ChinaThe State Key Laboratory of Refractories and Metallurgy, Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, ChinaAs 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<sub>3</sub> purged by Ar gas (containing 0.3% CO<sub>2</sub>) with different added ions (Ca<sup>2+</sup>, CO<sub>3</sub><sup>2−</sup> and SiO<sub>3</sub><sup>2−</sup>) 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<sup>2+</sup> on the corrosion behavior of iron is negligible, however, Cl<sup>−</sup> plays an important role in accelerating the corrosion activity with the increased concentration and temperature. With increased concentrations of CO<sub>3</sub><sup>2−</sup> and SiO<sub>3</sub><sup>2−</sup>, 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<sub>3</sub><sup>2−</sup>/SiO<sub>3</sub><sup>2−</sup> and Cl<sup>−</sup>. The formation of ferric silicate is dominant in the passivation film with the addition of SiO<sub>3</sub><sup>2−</sup>, which effectively protects the iron surface from corrosion.https://www.mdpi.com/1996-1944/13/12/2713pure irongroundwatercorrosion behaviorionstemperature |
| spellingShingle | Teng Li Guokai Huang Yanpeng Feng Miao Yang Lingyu Wang Daqing Cui Xian Zhang Effects of Different Ions and Temperature on Corrosion Behavior of Pure Iron in Anoxic Simulated Groundwater Materials pure iron groundwater corrosion behavior ions temperature |
| 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 | pure iron groundwater corrosion behavior ions temperature |
| url | https://www.mdpi.com/1996-1944/13/12/2713 |
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