Abstract The hot corrosion behaviour of pure nickel was investigated at 700 °C to highlight the influence of testing conditions (composition of the atmosphere and presence or not of a Na 2 SO 4 deposit) on the mechanisms of hot corrosion. The influence of SO 2 /SO 3 inward transport through the porous NiO growing scales was studied by exposing nickel in synthetic air and in synthetic air + 0.5% SO 2 /SO 3 without Na 2 SO 4 . The addition of Na 2 SO 4 decreased the p O 2 and the p S O 3 at the sample surface, which promoted the formation of Ni-S liquid solution at the metal/scale interface. A sufficient p S O 3 was required to stabilize liquid Na 2 SO 4 -NiSO 4 solutions and simulate Type-II hot corrosion conditions.

中文翻译：

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纯镍在 700°C 的热腐蚀机理：测试条件的影响

摘要 研究了纯镍在 700 °C 下的热腐蚀行为，以突出测试条件（气氛组成和是否存在 Na 2 SO 4 沉积物）对热腐蚀机制的影响。通过将镍暴露在合成空气和不含 Na 2 SO 4 的合成空气 + 0.5% SO 2 /SO 3 中，研究了 SO 2 /SO 3 通过多孔 NiO 生长尺度向内迁移的影响。Na 2 SO 4 的加入降低了样品表面的p O 2 和p SO 3 ，促进了Ni-S溶液在金属/氧化皮界面的形成。需要足够的 p SO 3 来稳定液态 Na 2 SO 4 -NiSO 4 溶液并模拟 II 类热腐蚀条件。