Abstract
Zircaloys undergo nodular corrosion in 10.5 MPa steam at 773 K. The corrosion was found to proceed via formations of zirconium dioxide, zirconium hydride and H 2 gas. Clarification of the role played by the H 2 gas has provided a corrosion mechanism wherein the ZrO 2 film is broken to initiate nodular corrosion, when the pressure of the H 2 gas accumulating in the ZrO 2-Zircaloy interface exceeds the pressure the ZrO 2 film can withstand. The mechanism can explain lenticular shape of nodules. Examination of influence of heat treatment and texture on the corrosion behavior supported the presumed mechanism. In connection with the mechanistic studies, second phase particles of Zircaloy have been identified.
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