奥氏体耐热钢Sanicro25在不同SO_2体积分数模拟烟气中的腐蚀研究
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摘要
为研究超超临界锅炉用新型奥氏体耐热钢Sanicro25在700℃模拟烟气中与煤灰协同作用下的腐蚀行为,探究了SO_2体积分数对材料高温腐蚀的影响。结果表明:在无SO_2的烟气中,Sanicro25钢由于表面形成了保护性氧化膜而具有良好的耐蚀性;在含SO_2的烟气中,Sanicro25钢出现热腐蚀,母材基体中发生了内氧化和内硫化,并且当烟气中SO_2体积分数达到0.50%时,表面腐蚀产物中发现明显的微裂纹,腐蚀产物剥落较多。
To study the corrosion behavior of new austenitic heat-resistant steel Sanicro25 for ultra-supercritical boilers under the combined action of simulated flue gas and coal ash with different SO_2 concentrations at 700 ℃, an analysis was conducted on the effects of SO_2 concentration in flue gas on the corrosion behavior of the material. Results show that Sanicro25 shows good corrosion resistance in simulated flue gas without SO_2, due to the protective oxide layer formed on the surface of the material. However, in the flue gas with SO_2, hot corrosion appears in the steel, with internal oxidation and sulfidation in the base metal; micro-cracks form in the corrosion layer and corrosion products peel off from the surface when the SO_2 volume fraction reaching 0.5%.
To study the corrosion behavior of new austenitic heat-resistant steel Sanicro25 for ultra-supercritical boilers under the combined action of simulated flue gas and coal ash with different SO_2 concentrations at 700 ℃, an analysis was conducted on the effects of SO_2 concentration in flue gas on the corrosion behavior of the material. Results show that Sanicro25 shows good corrosion resistance in simulated flue gas without SO_2, due to the protective oxide layer formed on the surface of the material. However, in the flue gas with SO_2, hot corrosion appears in the steel, with internal oxidation and sulfidation in the base metal; micro-cracks form in the corrosion layer and corrosion products peel off from the surface when the SO_2 volume fraction reaching 0.5%.
引文
[1] 赖仙红,杨华春.Sanicro 25 奥氏体耐热钢管性能简述[C]//中国能源学会.火电厂金属材料与焊接技术交流2012年会论文集.沈阳:中国能源学会,2012:77-81.
[2] 赵博,包汉生,刘正东,等.Sanicro25耐热钢中析出相的热力学计算与平衡相分析[J].材料导报,2012,26(20):174-179.
[3] 杨华春,林富生,谢锡善,等.欧洲700 ℃发电机组研发及617合金研究进展[J].发电设备,2012,26(5):355-359.
[4] 中川精和,吴蓓.超超临界压力锅炉过热器管材的高温灰腐蚀[J].锅炉技术,1987,18(4):25-33.
[5] 丁凤琴,宰守香.镍基高温合金的腐蚀行为研究[J].铸造技术,2014,35(8):1675-1677.
[6] 李美栓.金属的高温腐蚀[M].北京:冶金工业出版社,2001.
[7] 赵虹,魏勇.燃煤锅炉水冷壁烟侧高温腐蚀的机理及影响因素[J].动力工程,2002,22(2):1700-1704.
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[2] 赵博,包汉生,刘正东,等.Sanicro25耐热钢中析出相的热力学计算与平衡相分析[J].材料导报,2012,26(20):174-179.
[3] 杨华春,林富生,谢锡善,等.欧洲700 ℃发电机组研发及617合金研究进展[J].发电设备,2012,26(5):355-359.
[4] 中川精和,吴蓓.超超临界压力锅炉过热器管材的高温灰腐蚀[J].锅炉技术,1987,18(4):25-33.
[5] 丁凤琴,宰守香.镍基高温合金的腐蚀行为研究[J].铸造技术,2014,35(8):1675-1677.
[6] 李美栓.金属的高温腐蚀[M].北京:冶金工业出版社,2001.
[7] 赵虹,魏勇.燃煤锅炉水冷壁烟侧高温腐蚀的机理及影响因素[J].动力工程,2002,22(2):1700-1704.
[8] 刘道新.材料的腐蚀与防护[M].北京:西北工业大学出版社,2006.