Abstract The effects of alloying elements in Ni-5at%X binary alloys on intergranular (IG) corrosion and stress corrosion cracking (SCC) have been assessed in 300–360 °C hydrogenated water at the Ni/NiO stability line. Alloys with Cr or Al additions exhibited grain boundary oxidation and IGSCC, while localized degradation was not observed for pure Ni, Ni-Cu or Ni-Fe alloys. Environment-enhanced crack growth was determined by comparing the response in water and N2 gas. Results demonstrate that selective grain boundary oxidation of Cr and Al promoted IGSCC of these Ni alloys in hydrogenated water.

中文翻译：

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高纯镍二元合金在高温氢化水中的晶界选择性氧化及晶间应力腐蚀裂纹扩展

摘要 Ni-5at%X 二元合金中合金元素对晶间 (IG) 腐蚀和应力腐蚀开裂 (SCC) 的影响已在 300-360 °C 的氢化水中在 Ni/NiO 稳定线进行了评估。添加 Cr 或 Al 的合金表现出晶界氧化和 IGSCC，而纯 Ni、Ni-Cu 或 Ni-Fe 合金未观察到局部退化。通过比较在水和 N2 气体中的响应来确定环境增强的裂纹扩展。结果表明，Cr 和 Al 的选择性晶界氧化促进了这些 Ni 合金在氢化水中的 IGSCC。