Sulfidation Kinetics of Fe25Cr20Ni in H2S-H2 Atmosphere
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摘要: 使用連續稱重裝置和非連續稱重裝置對Fe25Cr20Ni合金在H2S-H2氣氛中的高溫硫化行為進行了研究。結果表明:這種合金的硫化行為遵循拋物線規律,腐蝕產物有3層:最外層(稱OL-Ⅱ層)由Fe-Ni-S系統組成;中間層(稱OL-Ⅰ層)由Fe-Cr-S系統組成;內硫化層(Subscale)由一些彌散的硫化物相組成,標記實驗的結果表明:合金在硫化過程中,腐蝕產物最外兩層的生長是由金屬離子向外擴散控制,而內硫化層的生長是由分解機理控制。Abstract: The sulfidation kinetics of Fe25Cr20Ni were cairied out at H2S-H2 atmospheres by means of continuously-weighing device and non-continuously weighing device. Sulfidation kinetics curves of the alloy obeys parabolic law.The composition and morphology of sulfide scales were also studied. All sulfide scales consist of two surface layers in addition to subscale. Two surface layers are controlled by predominant diffusion of metals. The subscale growth is controlled by the inward diffusion of suffur.
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Key words:
- kinetics sulfidation /
- H2S /
- corrosion /
- diffusion
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