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ORIGINAL RESEARCH article

Front. Mater.
Sec. Environmental Degradation of Materials
Volume 11 - 2024 | doi: 10.3389/fmats.2024.1543536
This article is part of the Research Topic Exploring Corrosion Resistance Mechanisms in Weathering Steel View all articles

Role of crevice size induced microenvironment variation within the gap in initiating crevice corrosion of 201 stainless steel

Provisionally accepted
Hao-Jing Ge Hao-Jing Ge 1*Yi-Han Bai Yi-Han Bai 1*Hang Zhang Hang Zhang 1*Hao-Ran Yuan Hao-Ran Yuan 1*Zejie Zhu Zejie Zhu 1*Pan Liu Pan Liu 2*Yun- Xiong Zeng Yun- Xiong Zeng 1Jiang-Ying Wang Jiang-Ying Wang 1*
  • 1 China Jiliang University, Hangzhou, China
  • 2 Tohoku University, Sendai, Miyagi, Japan

The final, formatted version of the article will be published soon.

    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.

    Keywords: Original Research Articles Crevice corrosion, gap size, pH, Stainless Steel, SECM

    Received: 11 Dec 2024; Accepted: 30 Dec 2024.

    Copyright: © 2024 Ge, Bai, Zhang, Yuan, Zhu, Liu, Zeng and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Hao-Jing Ge, China Jiliang University, Hangzhou, China
    Yi-Han Bai, China Jiliang University, Hangzhou, China
    Hang Zhang, China Jiliang University, Hangzhou, China
    Hao-Ran Yuan, China Jiliang University, Hangzhou, China
    Zejie Zhu, China Jiliang University, Hangzhou, China
    Pan Liu, Tohoku University, Sendai, 980-8577, Miyagi, Japan
    Jiang-Ying Wang, China Jiliang University, Hangzhou, China

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