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首页> 外文会议>STP 1467; International Symposium on Zirconium in the Nuclear Industry; 20040613-17; Stockholm(SE) >Shadow Corrosion Mechanism of Zircaloy
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Shadow Corrosion Mechanism of Zircaloy

机译：锆合金的阴影腐蚀机理

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摘要

The mechanism of Zircaloy shadow corrosion was studied theoretically and experimentally. The theoretical study showed shadow corrosion, with a few exceptions, to be remarkably consistent with a galvanic corrosion mechanism. The exceptions may be explained as radiation effects. An experiment was therefore devised to test the galvanic hypothesis, based on the fact that galvanic corrosion requires a closed current loop. Three pieces of Zircaloy cladding with stainless steel counter electrodes were exposed in-pile. Two of the claddings were galvanically coupled to the counters. The third cladding was well insulated by fitting it to a 100 mm sapphire tube. The claddings were irradiated together in oxidizing water chemistry for one reactor period. The galvanically coupled claddings developed shadow corrosion, but not the well insulated cladding.
机译：从理论和实验上研究了Zircaloy阴影腐蚀的机理。理论研究表明，阴影腐蚀（除少数例外）与电腐蚀机理非常一致。可以将例外解释为辐射效应。因此，基于电腐蚀需要闭合电流环路这一事实，设计了一个实验来检验电假说。将三块带有不锈钢对电极的Zircaloy覆层裸露在堆中。其中两个覆层通过电气方式与柜台相连。通过将第三包层安装到100毫米蓝宝石管上，可以很好地绝缘。在氧化水化学中将包层一起辐照一个反应器时间。电耦合的包层产生阴影腐蚀，但绝缘性不佳。

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