Magnetite-Accelerated Corrosion of SA508 Tubesheet Material and Its Effect on Steam Generator Tube Denting
Abstract
:1. Introduction
2. Experimental
2.1. Test Materials and Solutions
2.2. Magnetite-Deposited Corrosion Coupon
2.3. Immersion Corrosion Tests
2.4. Potentiodynamic Polarizaion Tests
3. Results and Discussion
3.1. Electrodeposited Magnetite Layer on SA508 Substrate
3.2. Immersion Corrosion Behavior
3.3. Potentiodynamic Polarization Curves
4. Conclusions
- Magnetite in contact with SA508 induced the fast corrosion of SA508. This accelerated corrosion of SA508 by magnetite was more severe in a test solution with sulfate ions.
- Regarding the electrochemical behavior, SA508 and magnetite acted as anodic and cathodic members, respectively, in the coupling system.
- In this coupling system, the corrosion current density of SA508 was increased by a galvanic corrosion mechanism with magnetite.
- Based on the experimental results, galvanic corrosion between magnetite and SA508 is proposed as a new acceleration contributor to the denting of SG tubes in the PWR secondary environment.
Author Contributions
Funding
Conflicts of Interest
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C | Si | Mn | P | S | Ni | Cr | Mo | Fe |
---|---|---|---|---|---|---|---|---|
0.199 | 0.051 | 1.52 | 0.005 | 0.006 | 0.987 | 0.232 | 0.582 | Bal. |
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Song, G.D.; Han, J.; Jeon, S.-H.; Hur, D.H. Magnetite-Accelerated Corrosion of SA508 Tubesheet Material and Its Effect on Steam Generator Tube Denting. Coatings 2019, 9, 575. https://doi.org/10.3390/coatings9090575
Song GD, Han J, Jeon S-H, Hur DH. Magnetite-Accelerated Corrosion of SA508 Tubesheet Material and Its Effect on Steam Generator Tube Denting. Coatings. 2019; 9(9):575. https://doi.org/10.3390/coatings9090575
Chicago/Turabian StyleSong, Geun Dong, Jeoh Han, Soon-Hyeok Jeon, and Do Haeng Hur. 2019. "Magnetite-Accelerated Corrosion of SA508 Tubesheet Material and Its Effect on Steam Generator Tube Denting" Coatings 9, no. 9: 575. https://doi.org/10.3390/coatings9090575