Corrosion of pre-oxidized nickel alloy X-750 in simulated BWR environment
Source abstract
Abstract
Samples of pre-oxidized Alloy X-750 were exposed to a simulated boiling water reactor environment in an autoclave at a temperature of 286 °C and a pressure of 80 bar for four weeks. The effect of alloy iron content on corrosion was investigated by comparing samples with 5 and 8 wt% Fe, respectively. In addition, the effect of two different surface pre-treatments was investigated. The microstructure of the formed oxide scales was studied using mainly electron microscopy. The results showed positive effects of an increased Fe content and of removing the deformed surface layer by pickling. After four weeks of exposure the oxide scale consists of oxides formed in three different ways. The oxide formed during pre-oxidization at 700 °C, mainly consisting of chromia, is partly still present. There is also an outer oxide consisting of NiFe2O4 crystals, reaching a maximum size of 3 ?m, which has formed by precipitation of dissolved metal ions. Finally, there is an inner nanocrystalline and porous oxide, with a metallic content reflecting the alloy composition, which has formed by corrosion. © 2017 Elsevier B.V.
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · Nuclear Materials and Properties · Hydrogen embrittlement and corrosion behaviors in metals
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References (18)
Show source-provided references
1. Calota · 2011
2. General corrosion of materials under simulated BWR primary water conditions10.1080/18811248.1994.9735174 ↗
3. K. Göransson, L. Hallstadius, C. Gustafsson, H. Lai, S. Tuzi, M. Thuvander, K. Stiller, A. Kucuk, and B. Josefsson, “Corrosion behaviour of alloy X-750 in BWR fuel at high flow rates,” in Conference proceeding Top Fuel 2015, Zurich 13-17 September 2015.
4. J. Chen, B. Forssgren, J. Lejon, and K. Fritioff, “On the stability of oxides formed under BWR conditions: some observations on a stainless steel and nickel-base alloys,” Nuclear Plant Chemistry Conference, Paris, France. 2012.
5. Protective oxide film on alloy X750 formed in air at 973 K10.1080/18811248.1994.9735190 ↗
6. Ahlberg and Rebensdorff, “General corrosion of alloy X-750 under BWR conditions,” in BNES Conf. Water Chem. Nucl. Reactor Syst, 6, Bournemouth, UK, 1992, pp. 278–285.
7. Oxide evolution on Alloy X-750 in simulated BWR environment10.1016/j.jnucmat.2016.09.026 ↗
8. Sims · 1987
9. Scale formation of alloy 602 CA during isothermal oxidation at 800–1100°C in different types of water vapor containing atmospheres10.1007/s11085-015-9595-7 ↗
10. D. J. Young, High Temperature Oxidation and Corrosion of Metals, 2nd Edition. Elsevier Science.
11. Diffusion of iron in Cr2O3: polycrystals and thin films10.1016/j.msea.2004.09.033 ↗
12. Effect of alternately changing the dissolved Ni ion concentration on the oxidation of 304 stainless steel in oxygenated high temperature water10.1016/j.corsci.2010.12.008 ↗
13. Y. Morikawa, “Reduction of radiation exposure in Japanese BWR Nuclear Power Plants,” in Proceedings of the Third International Workshop on the implementation of ALARA at nuclear power plants, Long Island, NY (United States); 8-11 May 1994.
14. An XAS study of the defect structure of Ti-doped α-Cr2O310.1016/j.ssi.2006.08.028 ↗
15. Phase studies in the chromium-manganese-titanium oxide system at different oxygen partial pressures10.1016/0955-2219(91)90054-4 ↗
16. Chromia layer growth on a Ni-based superalloy: sub-parabolic kinetics and the role of titanium10.1016/j.corsci.2013.05.016 ↗
17. Electrical conductivity of Cr2O3 doped with TiO210.1016/S0167-2738(98)00244-6 ↗
18. Defect properties of Ti-doped Cr2O310.1016/j.ssi.2005.11.015 ↗