Nodular Corrosion of Zirconium Alloys and XPS Analysis of Surface Oxide Layer

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  • Shibutani Hideo
    Department of Materials Science and Engineering, School of Engineering, Nagoya University
  • Morinaga Masahiko
    Department of Materials Science and Engineering, School of Engineering, Nagoya University
  • Kikuchi Keiichi
    Power Reactor and Nuclear Fuel Development Corporation

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  • ジルコニウム合金のノジュラー腐食とその表面酸化皮膜のX線光電子分光分析
  • ジルコニウム ゴウキン ノ ノジュラー フショク ト ソノ ヒョウメン サンカ

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Description

Nodular corrosion takes place in cladding tubes of the boiling water reactor. In order to understand the mechanism of the nodular corrosion, a series of corrosion tests was performed with pure Zr and Zr-M binary alloys (M=Sn, Fe, Cr, Ni) by exposing them to the steam environment of 773 K and 10.3 MPa. The chemical composition of the oxide layer formed on the specimen surface was analyzed using X-ray photoelectron spectroscopy. As a result, it was found that the distribution of alloying elements, M, in the oxide layer was relatively uniform in the case of uniform corrosion, whereas it was very non-uniform in the case of nodular corrosion. For example, in the latter case, alloying elements such as Cr and Sn were condensed mainly in the outer surface of the oxide layer. Such a non-uniform distribution of alloying elements will not be arisen from the heterogeneous distribution of alloying elements in the mother alloy, but will be introduced to the oxide layer on the alloy in the course of corrosion. The segregation of alloying elements will disturb the uniform growth of the oxide layer, resulting in the onset of nodular corrosion on the surface.

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