Nickel-based alloys are considered among other candidate materials as engineering barriers of geological repositories due to their excellent corrosion resistance. These alloys possess unique advantages: they may be used in saturated and unsaturated repositories, hosted by practically any rock type, while also compatible with any (or no) backfill, and have minimal impact in other barriers. Alloy-22 (UNS N06022) has been the most studied of this class of alloys for its potential application in the proposed repositories (namely Yucca Mountain, USA). Crevice corrosion is however an important and often unintended degradation process that may limit the waste container lifetime if a nickel-based alloy is selected. Alloy susceptibility to crevice corrosion is influenced by environmental and metallurgical variables. This review gives an account of the current knowledge regarding crevice corrosion of nickel-based alloys as candidate materials for the corrosion-resistant layer of high-level nuclear waste containers. Although there is a significant amount of research supporting the use of nickel-based alloys for this application, the effect of the different variables on crevice corrosion resistance is described. Special focus is given to the current criterion for crevice corrosion occurrence in repository environments, recent works and criticisms. The presently established criterion appears robust for ruling out crevice corrosion in saturated repositories; however, the development of a less conservative criterion for crevice corrosion occurrence is necessary to use these alloys in unsaturated repositories.

镍基合金由于其优异的耐腐蚀性，在其他候选材料中也被视为地质储藏库的工程屏障。这些合金具有独特的优势：它们可以用于饱和和不饱和储层中，几乎可以容纳任何类型的岩石，同时也可以与任何（或没有）回填物相容，并且对其他屏障的影响最小。合金22（UNS N06022）已在此类合金中进行了最深入的研究，因为它在拟议的资源库（即美国的丝兰山）中具有潜在的应用前景。但是，缝隙腐蚀是重要的且通常是意想不到的降解过程，如果选择镍基合金，则可能会限制废物容器的使用寿命。合金对缝隙腐蚀的敏感性受环境和冶金变量的影响。这篇综述介绍了有关镍基合金缝隙腐蚀的当前知识，镍基合金作为高级核废料容器耐腐蚀层的候选材料。尽管有大量研究支持将镍基合金用于此应用，但仍描述了不同变量对缝隙耐腐蚀性的影响。特别关注当前在仓库环境中发生缝隙腐蚀的标准，近期的工作和批评。目前建立的标准对于排除饱和储存库中的缝隙腐蚀似乎是很可靠的。但是，要在不饱和储层中使用这些合金，必须针对缝隙腐蚀的发生发展出较为保守的判据。