Abstract
Zr-4(Zr-1.5Sn-0.2Fe-0.1Cr,wt%), S5(Zr-0.8Sn-0.34Nb-0.39Fe-0.1Cr), T5(Zr-0.7Sn-1.07Nb-0.32Fe-0.08Cr) and Zr-1Nb were adopted to prepare Bi-containing zirconium alloys for systematically investigating the effect of Bi addition on the corrosion resistance of zirconium alloys. The specimens were corroded in superheated steam at 400℃/10.3 MPa, and in lithiated water with 0.01 M LiOH or in deionized water at 360℃/18.6 MPa by autoclave testing. Results show that the corrosion resistance increases with the increasing of Bi content dissolved in α-Zr. But the presence of Bi-con- taining second phase particles (SPPs) is unfavorable for the enhancement of corrosion resistance. This indicates that the Bi dissolved in α-Zr matrix plays an important role in improving the corrosion resistance, while the precipitation of the Bi-containing SPPs does harm to the corrosion resistance.
Highlights
Zirconium-based alloys have been used as fuel cladding materials in pressurized water reactors due to their low cross-section for thermal neutron absorption, good corrosion resistance and adequate mechanical properties
It can be seen that the addition of 0.1% - 0.5% Bi to Zr-4 is harmful to the corrosion resistance and the variation of Bi contents has a remarkable effect on the corrosion resistance in both corrosion conditions; the corrosion resistance of the Zr-4 + xBi alloy markedly decreased with the increase of Bi content, especially in superheated steam
This illustrates that the effect of Bi addition on the corrosion behavior of various zirconium-based alloys depends on the original compositions of alloys and corrosion circumstances
Summary
Zirconium-based alloys have been used as fuel cladding materials in pressurized water reactors due to their low cross-section for thermal neutron absorption, good corrosion resistance and adequate mechanical properties. There is no systematic research on Bi. From the consideration of the solubility and cross-section for thermal neutron absorption, our group studied the effect of Bi on the microstructures and corrosion resistance of various zirconium alloys. The corrosion resistance of these Bi-containing zirconium alloys was systematically reported to comprehensively understand the influence law of the different contents of Bi addition on the corrosion behavior of various zirconium-based alloys in this study
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