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将Super304H、HR3C钢试样置于700℃下不同SO_2浓度(0.5%,1.5%)模拟气氛中,间隔一定时间取出样品称重,获得腐蚀动力学曲线。采用XRD、SEM和EDS等测试技术对腐蚀产物成分、结构和形貌进行分析。结果表明:在高硫环境中HR3C钢比Super304H钢更耐蚀。Super304H钢的腐蚀产物主要由疏松的富铁氧化物,部分Cr、Ni的氧化物以及尖晶石类化合物和少量的硫化物组成;HR3C钢的腐蚀产物主要为Cr_2O_3和铁的氧化物以及少量硫化物。随着SO_2浓度升高,腐蚀层增厚,腐蚀产物中局部出现S富集,加速了合金腐蚀。
The samples of Super304H and HR3C steel were placed in simulated atmosphere of different SO2 concentration (0.5%, 1.5%) at 700 ℃. The samples were weighed at intervals and the corrosion kinetic curves were obtained. The composition, structure and morphology of corrosion products were analyzed by XRD, SEM and EDS. The results show that HR3C steel is more corrosion resistant than Super304H steel in high sulfur environment. The corrosion products of Super304H steel mainly consist of loose iron-rich oxides, some Cr, Ni oxides, spinel compounds and a small amount of sulfides. The corrosion products of HR3C steel are mainly Cr2O3 and iron oxides and a small amount of sulfides Things. With the increase of SO 2 concentration, the corrosion layer thickens, and the S concentration in the corrosion products locally accelerates the corrosion of the alloy.