鋁對Fe-25Cr合金在H<sub>2</sub>S-H<sub>2</sub>混合氣氛中高溫硫化腐蝕的作用

鋁對Fe-25Cr合金在H₂S-H₂混合氣氛中高溫硫化腐蝕的作用

摘要: 研究了5%Al、10%Al對Fe-25Cr合金在H₂S-H₂平衡混合氣氛中700~900℃下高溫硫化腐蝕行為。發現加Al能顯著降低Fe-25Cr合金的硫化速度并改變其硫化層的形貌、成分及結構。加Al合金的硫化動力學在孕育期后遵從拋物線規律。綜合反應動力學、硫化層結構和成分分析。提出了Fe-Cr-Al合金的硫化機理。

Abstract: The effects of 5% Al and 10% Al on the sulfidation behaviour of the Fe-25Cr alloy in H₂S-H₂ gas mixtures in the temperature range of 700~900℃ has been studied.The sulfidation resistance of Fe-25Cr was improved and sulfide scale morphologies,composition and structure of Fe-25Cr were changed remarkably.The sulfidation kinetics of the alloys with aluminium obeyed basically the parabolic law after an initial period of reaction time.The sulfidation mechanism of the Fe-Cr-Al alloy has been proposed.