The formation and stripping mechanism of oxide film on stainless steel surfaces
Typically, equipment in nuclear facilities operating in nitric acid media are made of stainless steel. Retired equipment exhibits relatively high levels of radioactivity, and chemical cleaning is a cost-effective and efficient method for decontamination. Currently, the formation rules of oxide films...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2024-06-01
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| Series: | International Journal of Advanced Nuclear Reactor Design and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468605024000437 |
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| author | Zhenqi Shen Guangkai Wang Fang Bao Tianhao Liu Yang Fei Zhenni Xie Yuxin Liang Xincheng Wang |
| author_facet | Zhenqi Shen Guangkai Wang Fang Bao Tianhao Liu Yang Fei Zhenni Xie Yuxin Liang Xincheng Wang |
| author_sort | Zhenqi Shen |
| collection | DOAJ |
| description | Typically, equipment in nuclear facilities operating in nitric acid media are made of stainless steel. Retired equipment exhibits relatively high levels of radioactivity, and chemical cleaning is a cost-effective and efficient method for decontamination. Currently, the formation rules of oxide films on stainless steel surfaces during long-term immersion in nitric acid systems, leading to the development of strong oxidizing chemical decontamination agents, were investigated. It was found that oxide film of stainless steel immersed in nitric acid solution for about 150 days stabilized at a thickness of around 6 μm. Subsequently, an inorganic acid-based strong oxidizing decontamination agent was developed with nitric acid as the main component. Meanwhile, two distinguished additives (A and B) were developed to promote the stripping of oxide film. The optimized ingredients were 3.3 mol/L nitric acid, 5 wt% additive A, and 0.12 wt% additive B, which resulted in a removal thickness of up to 27.35 μm immersed at 30 °C for 10 min. Furthermore, the stripping mechanism of oxide films on stainless steel surfaces was proposed, revealing the transition from a passivated state to an over-passivated state in nitric acid environments and leading to intergranular corrosion and potential grain detachment. |
| format | Article |
| id | doaj-art-6ff7f4b707cc490ca30c7dfcc7511977 |
| institution | Kabale University |
| issn | 2468-6050 |
| language | English |
| publishDate | 2024-06-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | International Journal of Advanced Nuclear Reactor Design and Technology |
| spelling | doaj-art-6ff7f4b707cc490ca30c7dfcc75119772025-02-02T05:29:08ZengKeAi Communications Co., Ltd.International Journal of Advanced Nuclear Reactor Design and Technology2468-60502024-06-0162164170The formation and stripping mechanism of oxide film on stainless steel surfacesZhenqi Shen0Guangkai Wang1Fang Bao2Tianhao Liu3Yang Fei4Zhenni Xie5Yuxin Liang6Xincheng Wang7Nuclear Chemical Engineering Research and Design Institute, China Nuclear Power Engineering Co., Ltd., 100084, Beijing, ChinaNuclear Chemical Engineering Research and Design Institute, China Nuclear Power Engineering Co., Ltd., 100084, Beijing, ChinaNuclear Chemical Engineering Research and Design Institute, China Nuclear Power Engineering Co., Ltd., 100084, Beijing, ChinaNuclear Chemical Engineering Research and Design Institute, China Nuclear Power Engineering Co., Ltd., 100084, Beijing, ChinaNuclear Chemical Engineering Research and Design Institute, China Nuclear Power Engineering Co., Ltd., 100084, Beijing, ChinaNuclear Chemical Engineering Research and Design Institute, China Nuclear Power Engineering Co., Ltd., 100084, Beijing, ChinaCollege of New Materials and Chemical Engineering, Beijing Institute of Petrochemical Technology, 102617, Beijing, ChinaCollege of New Materials and Chemical Engineering, Beijing Institute of Petrochemical Technology, 102617, Beijing, ChinaTypically, equipment in nuclear facilities operating in nitric acid media are made of stainless steel. Retired equipment exhibits relatively high levels of radioactivity, and chemical cleaning is a cost-effective and efficient method for decontamination. Currently, the formation rules of oxide films on stainless steel surfaces during long-term immersion in nitric acid systems, leading to the development of strong oxidizing chemical decontamination agents, were investigated. It was found that oxide film of stainless steel immersed in nitric acid solution for about 150 days stabilized at a thickness of around 6 μm. Subsequently, an inorganic acid-based strong oxidizing decontamination agent was developed with nitric acid as the main component. Meanwhile, two distinguished additives (A and B) were developed to promote the stripping of oxide film. The optimized ingredients were 3.3 mol/L nitric acid, 5 wt% additive A, and 0.12 wt% additive B, which resulted in a removal thickness of up to 27.35 μm immersed at 30 °C for 10 min. Furthermore, the stripping mechanism of oxide films on stainless steel surfaces was proposed, revealing the transition from a passivated state to an over-passivated state in nitric acid environments and leading to intergranular corrosion and potential grain detachment.http://www.sciencedirect.com/science/article/pii/S2468605024000437Stainless steelNitric acidPassivationStripping mechanism |
| spellingShingle | Zhenqi Shen Guangkai Wang Fang Bao Tianhao Liu Yang Fei Zhenni Xie Yuxin Liang Xincheng Wang The formation and stripping mechanism of oxide film on stainless steel surfaces International Journal of Advanced Nuclear Reactor Design and Technology Stainless steel Nitric acid Passivation Stripping mechanism |
| title | The formation and stripping mechanism of oxide film on stainless steel surfaces |
| title_full | The formation and stripping mechanism of oxide film on stainless steel surfaces |
| title_fullStr | The formation and stripping mechanism of oxide film on stainless steel surfaces |
| title_full_unstemmed | The formation and stripping mechanism of oxide film on stainless steel surfaces |
| title_short | The formation and stripping mechanism of oxide film on stainless steel surfaces |
| title_sort | formation and stripping mechanism of oxide film on stainless steel surfaces |
| topic | Stainless steel Nitric acid Passivation Stripping mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2468605024000437 |
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