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Modeling sub-parabolic oxidation kinetics of Zr-Sn-Nb alloy by numerically solving the space charge effect
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DOI：10.1142/S0217984926500910.png)
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Abstract
En 中文
Zr-Sn-Nb alloy, widely used as fuel cladding in light water reactors, exhibits sub-parabolic oxidation kinetics distinct from the parabolic behavior of Nb-solute-strengthened Zr-Nb alloys. This difference arises because abundant (Nb, Fe)-rich second-phase particles in Zr-Sn-Nb alloy drastically reduce Nb solid solubility, invalidating the charge-neutrality. Here, we retain the space charge density and numerically solve the built-in electric field evolution without invoking charge neutrality. The electrochemical model for the corrosion of zirconium alloys accurately reproduces Zr-Sn-Nb alloy's oxidation kinetics at 360 degrees C, yielding a power-law exponent of similar to 0.41 and a mean absolute percentage error of 4.86%. This work demonstrates that explicitly solving the space charge effect numerically is essential for predicting corrosion behavior of the zirconium alloy where solute compensation is limited.
Keywords:
Zr-Sn-Nb alloy
space charge effect
oxidation kinetics
nuclear fuel cladding
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2.2
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207
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6.6K
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