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<p>Various chromia-forming alloys were exposed to atmospheres of Ar-10%H<sub>2</sub>O and Ar-10%H<sub>2</sub>O-2.5%NH<sub>3</sub> at 800&#xa0;°C. A Cr<sub>2</sub>O<sub>3</sub> scale formed on SUS310S and Inconel 718 in both atmospheres, and no nitride formation was observed. However, the high-temperature corrosion resistance of Alloy 800H substantially decreased in Ar-10%H<sub>2</sub>O-2.5%NH<sub>3</sub> compared with in Ar-10%H<sub>2</sub>O, and internal oxide and thick internal nitride layers formed, despite the initial formation of a&#xa0;Cr<sub>2</sub>O<sub>3</sub> scale. These results suggest that the nitrogen permeability through Cr<sub>2</sub>O<sub>3</sub> scale may depend on the alloy substrate. In Alloy 800H, because the initially-formed Cr<sub>2</sub>O<sub>3</sub> scale did not suppress the nitrogen diffusion, an internal nitride layer formed beneath the Cr<sub>2</sub>O<sub>3</sub> scale, resulting in the breakaway of the Cr<sub>2</sub>O<sub>3</sub> scale and severe internal oxidation and nitridation.</p>

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High-Temperature Corrosion Behavior of Heat-Resistant Alloys in Atmosphere Containing Water Vapor and Ammonia

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Suzue Yoneda,
  • Shigenari Hayashi

摘要

Various chromia-forming alloys were exposed to atmospheres of Ar-10%H2O and Ar-10%H2O-2.5%NH3 at 800 °C. A Cr2O3 scale formed on SUS310S and Inconel 718 in both atmospheres, and no nitride formation was observed. However, the high-temperature corrosion resistance of Alloy 800H substantially decreased in Ar-10%H2O-2.5%NH3 compared with in Ar-10%H2O, and internal oxide and thick internal nitride layers formed, despite the initial formation of a Cr2O3 scale. These results suggest that the nitrogen permeability through Cr2O3 scale may depend on the alloy substrate. In Alloy 800H, because the initially-formed Cr2O3 scale did not suppress the nitrogen diffusion, an internal nitride layer formed beneath the Cr2O3 scale, resulting in the breakaway of the Cr2O3 scale and severe internal oxidation and nitridation.