Mechanism and kinetics of hematite reduction under typical PWR secondary circuit condition
Source abstract
Abstract
Abstract Hydrazine is added into secondary circuit in order to eliminate oxygen and to impose a reducing potential. Another possible role of hydrazine is to reduce hematite potentially present and thus reduce risk of stress corrosion cracking of steam generator tubes. However, the latter effect of hydrazine is still not clear. In order to better understand the mechanism and the kinetics of hematite reduction by hydrazine under secondary circuit conditions (275 °C, slightly alkaline, diluted hydrazine), an experimental study has been carried out. It was found that the reduction of hematite proceeds through the adsorption of hydrazine, surface reduction and dissolution of hematite, and coprecipitation of well crystallized octahedral magnetite.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Mine drainage and remediation techniques · Corrosion Behavior and Inhibition · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (35)
Show source-provided references
1. 2002
2. Optimum EDTA solvent chemistry for iron oxide removal at 150 °C10.1016/S0022-3115(02)00912-1 ↗
3. Effect of dissolved oxygen content on stress corrosion cracking of a cold worked 316L stainless steel in simulated pressurized water reactor primary water environment10.1016/j.jnucmat.2013.11.027 ↗
4. Poly(acrylic acid- co -maleic acid), a polymer dispersant for the control of oxide deposition over nuclear steam generator surfaces10.1016/j.jnucmat.2017.11.031 ↗
5. SCC analysis of Alloy 600 tubes from a retired steam generator10.1016/j.jnucmat.2013.04.061 ↗
6. Analyses of fuel crud and coolant-borne corrosion products in normal water chemistry BWRs10.1016/j.jnucmat.2011.08.032 ↗
7. Mechanism and kinetics of magnetite oxidation under hydrothermal conditions10.1039/C9RA03234G ↗
8. Mossbauer analysis on PWR secondary circuit of EDF’s NPP fleet and Ringhals NPP
9. Stutzmann
10. The oxidation behavior of 316L in simulated pressurized water reactor environments with cyclically changing concentrations of dissolved oxygen and hydrogen10.1016/j.jnucmat.2018.09.049 ↗
11. 2000
12. A method of examining iron oxides speciation and transport to steam generators during nuclear power reactor startups10.1016/j.jnucmat.2010.09.056 ↗
13. Secondary chemistry conditioning in EDF Fleet: operational experience of ETA conditioning and ammonia injection; impact on chemistry, steam generator deposits and operation
14. Layup practices at EDF PWR fleet and future developments
15. Experimental and theoretical study on the β-FeOOH nanorods: growth and conversion10.1007/s11051-011-0320-4 ↗
16. Duchateau · 2013
17. A novel chemical reduction route toward fabrication of Fe3O4 octahedrons and Fe tubes10.1007/s10853-009-3866-0 ↗
18. Preparation of well-defined colloidal particles by thermal decomposition of metal chelates. I. Iron oxides10.1016/0021-9797(80)90210-6 ↗
19. Stability of hydrazine, morpholine and ethanolamine at 275 °C and in situ measurement of redox and acid–base properties10.1007/s10953-015-0375-4 ↗
20. User’s guide to PHREEQC (Version 2): a computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations
21. Siebentritt · 2013
22. Studies on the one-step preparation of iron nanoparticles in solution10.1016/j.jcrysgro.2004.12.009 ↗
23. Delaunay · 2010
24. Cobble · 1982
25. 2018
26. Lemire · 2013 · vol. 13a
27. Lee · 1978
28. The reduction reaction of dissolved oxygen in water by hydrazine over platinum catalyst supported on activated carbon fiber10.1016/S0926-860X(99)00086-1 ↗
29. Kinetics of lead(IV) oxide (PbO2) reductive dissolution: role of lead(II) adsorption and surface speciation10.1016/j.jcis.2012.09.022 ↗
30. Carboxylate-containing chelating agent interactions with amorphous chromium hydroxide: adsorption and dissolution10.1016/j.gca.2008.04.010 ↗
31. Reductive dissolution of iron(III) (hydr)oxides by hydrogen sulfide10.1021/la00042a030 ↗
32. Reductive dissolution of hematite in acidic iodide solutions10.1021/la960203u ↗
33. Reductive dissolution of hematite in hydrochloric acid medium by some inorganic and organic reductants: a comparative study
34. Prusek · 2012
35. 1996