TY - GEN
T1 - Evaluation of hydrothermally-deposited zirconium oxide coatings to mitigate intergranular stress corrosion cracking in BWR environments
AU - Chou, P. H.
AU - Pathania, R.
AU - Toloczko, M. B.
AU - Bruemmer, S. M.
AU - Lvov, S. N.
AU - Chalkova, E.
AU - Balashov, V.
PY - 2009
Y1 - 2009
N2 - A hydrothermal deposition process was explored as a route to deposit a ZrO2 coating for the mitigation of IGSCC in the BWR environment. Since it would be greatly advantageous to conduct deposition at a plant without defueling, a thin resistive coating (say <30 μm) that is still capable of conferring a low ECP would be much more desirable than a thicker one, in order to avoid potentially negative impact on heat transfer. However, only thick coatings (> ~40 μm) were capable of conferring low values of ECP; thin coatings (< ~5 μm) were not. Thinner coatings are more likely to contain defects that allow the environment access to the underlying metal. At the same time, a crack growth-rate test conducted in high-temperature water with 30 ppb sulfate addition, under both NWC and HWC, on a sensitized 304 SS specimen deposited with a thin coating of ZrO2 showed near-identical response to an uncoated specimen.
AB - A hydrothermal deposition process was explored as a route to deposit a ZrO2 coating for the mitigation of IGSCC in the BWR environment. Since it would be greatly advantageous to conduct deposition at a plant without defueling, a thin resistive coating (say <30 μm) that is still capable of conferring a low ECP would be much more desirable than a thicker one, in order to avoid potentially negative impact on heat transfer. However, only thick coatings (> ~40 μm) were capable of conferring low values of ECP; thin coatings (< ~5 μm) were not. Thinner coatings are more likely to contain defects that allow the environment access to the underlying metal. At the same time, a crack growth-rate test conducted in high-temperature water with 30 ppb sulfate addition, under both NWC and HWC, on a sensitized 304 SS specimen deposited with a thin coating of ZrO2 showed near-identical response to an uncoated specimen.
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M3 - Conference contribution
AN - SCOPUS:78649338211
SN - 9781617388538
T3 - 14th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors 2009
SP - 470
EP - 495
BT - 14th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors 2009
T2 - 14th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors 2009
Y2 - 23 August 2009 through 27 August 2009
ER -