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应用XRD、SEM(EDS)和EMPA等分析方法研究了预涂覆碱金属硫酸盐的Super304H在模拟烟气环境下的高温腐蚀特性。结果表明,Super304H在模拟气氛下的腐蚀动力学呈“抛物线”趋势递增;腐蚀产物由较多的富铁氧化物、部分Cr2O3以及少量尖晶石结构的复杂氧化物与Fe/Ni硫化物组成;SO2浓度的提高加速了合金的腐蚀,氧化膜明显增厚,与基体结合程度变差甚至剥离,腐蚀影响区孔隙密度增大,腐蚀深度增加。分析认为:Super304H在模拟烟气环境中的腐蚀归因于合金元素的氧化与硫化、三元共晶复合盐的形成以及金属(氧化物)在熔盐中的溶解。
XRD, SEM (EDS) and EMPA were used to study the high temperature corrosion properties of pre-coated alkali metal sulfate Super304H under simulated flue gas environment. The results show that the corrosion kinetics of Super304H is in “parabolic” trend under simulated atmosphere. The corrosion products consist of more iron-rich oxides, some Cr2O3 and a few spinel complex oxides and Fe / Ni sulfides . The SO2 concentration accelerated the corrosion of the alloy, and the oxide film obviously thicken. The bonding degree with the matrix worsened and even peeled off. The pore density in the corrosion affected zone increased and the corrosion depth increased. The analysis shows that the corrosion of Super304H in simulated flue gas environment is attributed to the oxidation and sulfidation of alloying elements, the formation of ternary eutectic composite salt and the dissolution of metal (oxide) in molten salt.