Stress Corrosion in Magnetite

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 3505

Special Issue Editors


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Guest Editor
Korea Atomic Energy Research Institute, Daejeon, Republic of Korea
Interests: stress corrosion cracking; environmental degradation of nuclear materials; electrochemical corrosion behavior; stainless steel development; corrosion products
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Guest Editor
Future Energy Plant Convergence Research Center, Korea Research Institute of Standards and Science, Daejeon, Korea
Interests: high-temperature corrosion; stress corrosion cracking; flow accelerated corrosion; oxide formation behavior

Special Issue Information

Dear Colleagues,

Magnetite sludge depositing inside steam generators is the major root cause of loss of heat transfer, impurity accumulation, and materials corrosion and degradation. So far, stress corrosion cracking of steam generator tubes has mainly focused on water chemistry in the crevices, such as chemical impurity concentrations, pH values, and temperature. However, it should be considered that the actual stress corrosion cracking occurs on the surface of a steam generator tube covered with magnetite deposits under operating condition of nuclear power plants. Magnetite is an oxide, but it shows almost metallic behavior with respect to its electrical properties. Hence, numerous microgalvanic cells can be formed on the surface of steam generator tubes within the porous magnetite and can be affected by corrosion phenomena.

We invite investigators to submit papers that discuss the various corrosion phenomena in magnetite, including stress corrosion cracking, general corrosion, flow-accelerated corrosion, pitting corrosion, intergranular attack, etc. Furthermore, mitigation technologies for magnetite deposition on steam generator tubing based on water chemistry, coating, advanced materials, and surface property control are welcomed.

The potential topics include but again are not limited to:

  • Magnetite-accelerated corrosion and stress corrosion cracking in magnetite;
  • Electrochemical role of magnetite in the accelerated corrosion process;
  • Simulation technology of magnetite deposit similar to those of steam generator tubes;
  • Development of advanced water chemistry for magnetite deposition mitigation.
Dr. Soon-Hyeok Jeon
Dr. Geun Dong Song
Guest Editors

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Keywords

  • Stress corrosion cracking in corrosion product
  • Corrosion product in secondary water system of PWR
  • Corrosion behavior in nuclear power plant
  • Mitigation technology for magnetite deposition
  • Galvanic effect between magnetite and various materials
  • Magnetite deposition
  • Electrochemical corrosion test
  • Microstructure and oxide formation behavior

Published Papers (1 paper)

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Research

16 pages, 5712 KiB  
Article
Simulation of Porous Magnetite Deposits on Steam Generator Tubes in Circulating Water at 270 °C
by Soon-Hyeok Jeon, Hee-Sang Shim, Ji-Min Lee, Jeoh Han and Do Haeng Hur
Crystals 2020, 10(9), 729; https://doi.org/10.3390/cryst10090729 - 20 Aug 2020
Cited by 5 | Viewed by 3160
Abstract
In the secondary side of pressurized water reactors (PWRs), the main corrosion product accumulated on the steam generator (SG) tubes is magnetite, which has a porous structure. The purpose of this work is to simulate the porous magnetite deposited to the SG tubes [...] Read more.
In the secondary side of pressurized water reactors (PWRs), the main corrosion product accumulated on the steam generator (SG) tubes is magnetite, which has a porous structure. The purpose of this work is to simulate the porous magnetite deposited to the SG tubes using a loop system. We newly developed a circulating loop system for a porous magnetite deposition test. A test section was designed as a single hydraulic flow channel, and a cartridge heater was fabricated and mounted into a commercial SG tube to provide an equal heating source for the primary water. After the deposition test, the simulated magnetite deposits were characterized for comparison to real SG tube deposits collected from an operating PWR plant. The magnetite deposits produced using the loop system were appropriate for simulating the real SG tube deposits because the particle characteristics, phase, and porous morphology are closely similar to those of real deposit samples. Using the loop system, the chemical impurities such as Na and Cl can be easily concentrated within the pores of the simulated magnetite deposits. These simulated magnetite samples are expected to be widely utilized in various research fields such as the heat transfer degradation and magnetite accelerated corrosion of SG tubes. Full article
(This article belongs to the Special Issue Stress Corrosion in Magnetite)
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