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Hot Corrosion Performance of Plasma-Sprayed Multiwalled Carbon Nanotube–Al 2 O 3 Composite Coatings in a Coal-Fired Boiler at 900 °C
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-02 , DOI: 10.1007/s11665-020-05070-8
Rakesh Goyal , Buta Singh Sidhu , Vikas Chawla

The present study investigates the high-temperature corrosion behavior of plasma-coated boiler steel for 1000 h in a 110-MW water tube boiler, which had encountered severe corrosion and the tube failure. The coating was carried out by alumina and MWCNTs (multiwalled carbon nanotubes)-reinforced alumina composite powders. The uncoated and coated steel substrates were hung at a platen superheater at 900 °C. After the exposure, thermogravimetric analysis was carried out to evaluate the kinetics of corrosion. XRD, SEM, TEM and EDS analysis was carried out to evaluate the corrosion products at the end of the cyclic high-temperature corrosion. The present research work concludes that CNT-reinforced alumina coatings (4.0 wt.% CNT + Al2O3 coating) have decreased the corrosion rate to 30.72 mpy, which was 113.53 mpy for conventional alumina coatings and 376.96 mpy for bare T11 boiler steel in the boiler environment. This manuscript submits the failure of tube at the platen superheater, exposure conditions and the analysis of the coated and uncoated samples of the steel tubes.



中文翻译:

等离子喷涂碳纳米管-Al 2 O 3复合涂层在燃煤锅炉中900°C的热腐蚀性能

本研究研究了等离子涂层锅炉钢在110 MW水管锅炉中1000 h的高温腐蚀行为,该锅炉遇到了严重的腐蚀和管子故障。涂覆是通过氧化铝和MWCNTs(多壁碳纳米管)增强的氧化铝复合粉末进行的。将未涂覆和涂覆的钢基材悬挂在900°C的压板过热器上。暴露后,进行热重分析以评估腐蚀的动力学。进行了XRD,SEM,TEM和EDS分析,以评估循环高温腐蚀结束时的腐蚀产物。本研究工作得出的结论是,CNT增强氧化铝涂层(4.0 wt。%CNT + Al 2 O 3涂层)的腐蚀速率降低到30.72 mpy,在锅炉环境中,常规氧化铝涂层的腐蚀速率为113.53 mpy,裸露的T11锅炉钢的腐蚀速率为376.96 mpy。该手稿提出了在压板过热器处管子的故障,暴露条件以及对钢管涂层和未涂层​​样品的分析。

更新日期:2020-09-03
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