Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Crevice chemistry and corrosion in high temperature water: A review

  • Young-Jin Kim (Institute of Future Energy Technology, FNC Technology Co. Ltd) ;
  • Chi Bum Bahn (School of Mechanical Engineering, Pusan National University) ;
  • Seung Heon Baek (Institute of Future Energy Technology, FNC Technology Co. Ltd) ;
  • Wonjun Choi (School of Mechanical Engineering, Pusan National University) ;
  • Geun Dong Song (Institute of Future Energy Technology, FNC Technology Co. Ltd)
  • Received : 2023.11.19
  • Accepted : 2024.03.10
  • Published : 2024.08.25
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Abstract

Crevice corrosion is a localized attack of metal that occurs in occluded areas of materials as a result of a degradation of the oxide passivity on the metal surface in contact with stagnant environments. Materials suffer crevice corrosion when generally the crevice opening gap is so narrow that the migration or diffusion of ionic species into the crevice can be restricted and consequently results in the production of aggressive crevice solutions and differential aeration conditions over time. Among several factors affecting the crevice corrosion, differential aeration causing oxygen depletion associated with the geometry of components, acidification, and accumulation of aggressive species (e.g., Cl-, SO4-2, NO3- ) in the crevice solution become main aspects of the mechanism of the crevice corrosion. Thus, controlling such factors is most critically necessary to either prevents or terminates the crevice corrosion. This paper covers electrochemical aspects of the crevice corrosion, roles of critical factors affecting the crevice corrosion, and electrochemical processes of impurity species in the crevice in high temperature water. A better and clear understanding of mechanisms of the crevice corrosion is important to develop the protection and mitigation technology against the crevice corrosion in order for maintaining the integrity and longevity of structural components at various industries

Keywords

Acknowledgement

This work was financially supported by Korea Hydro & Nuclear Power Co. Ltd. (KHNP) (Contract No. 22-Tech-4).

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