Role of crevice size induced microenvironment variation within the gap in initiating crevice corrosion of 201 stainless steel
The effects of the real-time changes in the microenvironment within the crevice caused by the change in crevice size on the induction of crevice corrosion of 201 stainless steel (201-SS) in 1 M (pH = 4.00) NaCl solution were evaluated using conventional methods and scanning electrochemical microscop...
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| Format: | Article |
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Frontiers Media S.A.
2025-01-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmats.2024.1543536/full |
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| author | Hao-Jing Ge Yi-Han Bai Hang Zhang Hao-Ran Yuan Ze-Jie Zhu Pan Liu Yun-Xiong Zeng Jiang-Ying Wang |
| author_facet | Hao-Jing Ge Yi-Han Bai Hang Zhang Hao-Ran Yuan Ze-Jie Zhu Pan Liu Yun-Xiong Zeng Jiang-Ying Wang |
| author_sort | Hao-Jing Ge |
| collection | DOAJ |
| description | The effects of the real-time changes in the microenvironment within the crevice caused by the change in crevice size on the induction of crevice corrosion of 201 stainless steel (201-SS) in 1 M (pH = 4.00) NaCl solution were evaluated using conventional methods and scanning electrochemical microscopy (SECM) containing potentiometric probes. Results show that a decrease in pH and an increase in the Cl− concentration within the gap are the pivotal determinants of crevice corrosion initiation. A narrower crevice creates a more aggressive corrosive environment. After immersion for 48 h, the corresponding pH values at the mouths of crevice with widths of 100, 250, 400 and 550 μm dropped to 1.64, 2.26, 2.73 and 2.88, respectively. The crevice size affects the accumulation rate of erosive ions and the initiation time of pits corrosion within the crevice, through the volume and diffusion effect. The coupling effect of the decrease in pH value and the increase in concentration of chloride ions is the main driver for the negative shift of the open circuit potential (OCP) and corrosion potential of 201-SS. |
| format | Article |
| id | doaj-art-527c4efa5916496ba372e0b8c1e2f5dd |
| institution | Kabale University |
| issn | 2296-8016 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Materials |
| spelling | doaj-art-527c4efa5916496ba372e0b8c1e2f5dd2025-01-17T05:10:11ZengFrontiers Media S.A.Frontiers in Materials2296-80162025-01-011110.3389/fmats.2024.15435361543536Role of crevice size induced microenvironment variation within the gap in initiating crevice corrosion of 201 stainless steelHao-Jing Ge0Yi-Han Bai1Hang Zhang2Hao-Ran Yuan3Ze-Jie Zhu4Pan Liu5Yun-Xiong Zeng6Jiang-Ying Wang7School of Materials and Chemistry, China Jiliang University, Hangzhou, ChinaSchool of Materials and Chemistry, China Jiliang University, Hangzhou, ChinaSchool of Materials and Chemistry, China Jiliang University, Hangzhou, ChinaSchool of Materials and Chemistry, China Jiliang University, Hangzhou, ChinaSchool of Materials and Chemistry, China Jiliang University, Hangzhou, ChinaFrontier Research Initiative, New Industry Creation Hatchery Center (NICHe), Tohoku University, Sendai, Miyagi, JapanSchool of Materials and Chemistry, China Jiliang University, Hangzhou, ChinaSchool of Materials and Chemistry, China Jiliang University, Hangzhou, ChinaThe effects of the real-time changes in the microenvironment within the crevice caused by the change in crevice size on the induction of crevice corrosion of 201 stainless steel (201-SS) in 1 M (pH = 4.00) NaCl solution were evaluated using conventional methods and scanning electrochemical microscopy (SECM) containing potentiometric probes. Results show that a decrease in pH and an increase in the Cl− concentration within the gap are the pivotal determinants of crevice corrosion initiation. A narrower crevice creates a more aggressive corrosive environment. After immersion for 48 h, the corresponding pH values at the mouths of crevice with widths of 100, 250, 400 and 550 μm dropped to 1.64, 2.26, 2.73 and 2.88, respectively. The crevice size affects the accumulation rate of erosive ions and the initiation time of pits corrosion within the crevice, through the volume and diffusion effect. The coupling effect of the decrease in pH value and the increase in concentration of chloride ions is the main driver for the negative shift of the open circuit potential (OCP) and corrosion potential of 201-SS.https://www.frontiersin.org/articles/10.3389/fmats.2024.1543536/fullcrevice corrosiongap sizepHstainless steelSECM |
| spellingShingle | Hao-Jing Ge Yi-Han Bai Hang Zhang Hao-Ran Yuan Ze-Jie Zhu Pan Liu Yun-Xiong Zeng Jiang-Ying Wang Role of crevice size induced microenvironment variation within the gap in initiating crevice corrosion of 201 stainless steel Frontiers in Materials crevice corrosion gap size pH stainless steel SECM |
| title | Role of crevice size induced microenvironment variation within the gap in initiating crevice corrosion of 201 stainless steel |
| title_full | Role of crevice size induced microenvironment variation within the gap in initiating crevice corrosion of 201 stainless steel |
| title_fullStr | Role of crevice size induced microenvironment variation within the gap in initiating crevice corrosion of 201 stainless steel |
| title_full_unstemmed | Role of crevice size induced microenvironment variation within the gap in initiating crevice corrosion of 201 stainless steel |
| title_short | Role of crevice size induced microenvironment variation within the gap in initiating crevice corrosion of 201 stainless steel |
| title_sort | role of crevice size induced microenvironment variation within the gap in initiating crevice corrosion of 201 stainless steel |
| topic | crevice corrosion gap size pH stainless steel SECM |
| url | https://www.frontiersin.org/articles/10.3389/fmats.2024.1543536/full |
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