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在人工合成烟气环境中研究了一种新型镍-铬-铁基高温合金GH984G在700℃的腐蚀行为,通过改变烟气中SO_2浓度探索了SO_2浓度对材料高温腐蚀行为的影响。结果表明:在700℃下腐蚀随着气氛中SO_2浓度的升高而加重,不同SO_2浓度气氛中合金表面都形成了以Cr_2O_3为主的致密氧化膜。气氛中SO_2与金属反应在氧化膜中生成少量硫化物,在氧化膜/基体界面有硫的富集。由于致密的Cr_2O_3具有良好的保护性,GH984G合金在不同SO_2的烟气环境中表现出良好的耐蚀性。
The corrosion behavior of GH984G, a new nickel-chromium-iron-based superalloy, at 700 ℃ was studied in synthetic flue gas atmosphere. The effect of SO_2 concentration on the high temperature corrosion behavior was investigated by changing SO 2 concentration in the flue gas. The results show that with the increase of SO 2 concentration in the atmosphere at 700 ℃, the dense oxide film with Cr 2 O 3 as the main surface is formed on the surface of alloy under different SO 2 concentrations. Sulfur dioxide reacts with metal in the atmosphere to form a small amount of sulfides in the oxide film and sulfur is enriched at the oxide film / matrix interface. Due to the dense protective Cr_2O_3, GH984G alloy shows good corrosion resistance in different SO_2 flue gas environments.