风帽用高温合金的抗高温腐蚀性能研究
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摘要
流化床锅炉风帽在高温下运行常发生腐蚀和磨损,为此,通过添加多种合金元素的方法研制出了用于制作风帽的新型耐磨、耐蚀高温合金CH1和CH2。对新研制的高温合金采用涂抹腐蚀剂的方法进行了1 000℃×100 h的高温腐蚀试验,并与25-20合金和316钢的耐高温腐蚀性能作了比较。采用金相检验、X射线衍射、能谱分析等方法研究了CH合金的显微组织及其氧化膜成分。结果表明:CH1和CH2合金的耐高温腐蚀性能分别是25-20合金的3倍和4. 3倍,远优于316钢,其复合氧化膜主要由Cr_2O_3和Fe+2Cr_2O_4组成。
Nozzle button of fluidized bed boiler is frequently corroded and worn due to its operating in hightemperature environment. For this reason, new type of wear-and corrosion-resistant superalloys CHI and CH2 which may be used for the nozzle button were developed by alloying with several different elements. The newly developed superalloys were subjected to high-temperature corrosion test at 1 000 ℃ for 100 h after daubing corrosive agent on the specimens, and were compared with 25-20 alloy and 316 steel in high-temperature corrosion resistance. Their microstructure and oxide film components were investigated by metallographic test, X-ray diffraction, and energy dispersive spectrometer. The results showed that high-temperature corrosion resistance of the superalloys CHI and CH_2 was respectively 3 and 4. 3 times as high as that of 25-20 alloy, considerably superior to that of 316 steel, and that their oxide film was mainly composed of Cr203 and Fe +2 Cr_2 O_4.
Nozzle button of fluidized bed boiler is frequently corroded and worn due to its operating in hightemperature environment. For this reason, new type of wear-and corrosion-resistant superalloys CHI and CH2 which may be used for the nozzle button were developed by alloying with several different elements. The newly developed superalloys were subjected to high-temperature corrosion test at 1 000 ℃ for 100 h after daubing corrosive agent on the specimens, and were compared with 25-20 alloy and 316 steel in high-temperature corrosion resistance. Their microstructure and oxide film components were investigated by metallographic test, X-ray diffraction, and energy dispersive spectrometer. The results showed that high-temperature corrosion resistance of the superalloys CHI and CH_2 was respectively 3 and 4. 3 times as high as that of 25-20 alloy, considerably superior to that of 316 steel, and that their oxide film was mainly composed of Cr203 and Fe +2 Cr_2 O_4.
引文
[1]戴焱彬,游碧龙,刘少光,等.循环流化床锅炉风帽合金的组织及抗高温氧化性能研究[J].功能材料,2012,43(8):1068-1071.
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[2]李美拴.金属的高温腐蚀[M].北京:冶金工业出版社,2001.
[3]李云,郭建亭,袁超,等.镍基铸造高温合金K35的热腐蚀行为[J].中国腐蚀与防护学报,2005,25(4):250-255.
[4]赵双群,谢锡善,GAYLORD D,et al.新型镍基高温合金在模拟燃煤锅炉环境中的腐蚀[J].金属学报,2004, 40(6):659-663.
[5] DAI Yanbin, YOU Bilong, LIU Shaoguang. Research on HighTemperature Erosion Behavior of CFB Boiler Air Distribution Plate Nozzles[J]. Proceedings of 2011 China FunctionalMaterials Technology and Industry Forum, 2011:347-352.
[6] LUO Laima, LIU Shaoguang. High-temperature erosion behavior of high-velocity arc-spraying FeMnCr/Cr3 C2 coatings[J]. Rare Metal Materials and Engineering, 2010, 39(2):234-235.
[7] UUSITALO M A, VUORISTO P M J, MANTYLA T A. High temperature corrosion of coatingsand boiler steels below chlorinecontainingsalt deposits[J]. Corrosion Science, 2004,46:1311-1312.