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首页> 外文会议>12th International Conference on Environmental Degradation of Materials in Nuclear Power Systems: Water Reactors 2005 vol.2 >Electrochemical Behavior of Oxygen and Hydrogen on ZrO_2 Treated Type 304 Stainless Steels in High Temperature Pure Water
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Electrochemical Behavior of Oxygen and Hydrogen on ZrO_2 Treated Type 304 Stainless Steels in High Temperature Pure Water

机译：ZrO_2处理的304不锈钢在高温纯水中的氧和氢电化学行为

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摘要

For enhancing the effectiveness of hydrogen water chemistry (HWC) in boiling water reactors (BWRs) in the aspects of lower hydrogen consumption and of a more effective reduction in electrochemical corrosion potential (ECP), the technique of inhibitive protective coating on structural materials was brought into consideration. The application of inhibitive treatment is aimed at deterring the reduction reactions of oxidizing species occurring on metal surfaces and the oxidation reaction of metals. In the current study, electrochemical polarization analyses at 288℃ were conducted to characterize the electrochemical properties of ZrO_2 treated and untreated 304 stainless steel specimens in pure water with dissolved oxygen or hydrogen. The polarization results showed that the treated specimens exhibited lower corrosion potentials, corrosion current densities, exchange current densities, and cathodic current densities than the untreated one in high temperature pure water with dissolved oxygen. For the environment with dissolved hydrogen only, reductions in anodic current density and exchange current density were observed, indicating that the ZrO_2 treatment also deterred the oxidation reaction of hydrogen. However, in comparison with the data obtained, the ZrO_2 treatment seemed to be relatively more effective in inhibiting the oxygen reduction reaction than inhibiting the hydrogen oxidation reaction. One additional beneficial outcome was that the anodic current density of the metal was also decreased, leading to a much lower overall corrosion current density of the ZrO_2 treated specimen.
机译：为了在降低氢耗量和更有效地降低电化学腐蚀电位（ECP）方面提高沸水反应堆（BWR）中的氢水化学（HWC）的有效性，提出了在结构材料上使用抑制性保护涂层的技术考虑在内。抑制处理的应用旨在阻止发生在金属表面上的氧化物种的还原反应和金属的氧化反应。在当前的研究中，进行了288℃的电化学极化分析，以表征ZrO_2处理和未处理的304不锈钢样品在纯水中的溶解氧或氢的电化学性能。极化结果表明，在高温的纯水和溶解的氧气中，处理后的样品比未处理的样品具有更低的腐蚀电位，腐蚀电流密度，交换电流密度和阴极电流密度。对于仅具有溶解氢的环境，观察到阳极电流密度和交换电流密度降低，这表明ZrO_2处理也阻止了氢的氧化反应。然而，与获得的数据相比，ZrO_2处理似乎在抑制氧还原反应方面比抑制氢氧化反应相对更有效。另一个有益的结果是，金属的阳极电流密度也降低了，导致ZrO_2处理过的试样的整体腐蚀电流密度低得多。

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