High-temperature corrosion resistance of Fe–Cr–Mo amorphous coating for water wall protection of USC boiler  

作　　者：Zhao Zhang Cheng Zhou Fang-zhou Jin Yong-feng Cai Yi-fan Ni Cheng-hao Fan Dan Song 

机构地区：[1]College of Materials Science and Engineering,Hohai University,Changzhou,213022,Jiangsu,China [2]Wuhu Power Generation Co.,Ltd.,China Power International Holding Ltd.,Wuhu,241000,Anhui,China [3]Energy Conservation Research Center,Shanghai Power Equipment Research Institute,Shanghai,200240,China

出　　处：《Journal of Iron and Steel Research International》2024年第12期3120-3134,共15页钢铁研究学报(英文版)

基　　金：The authors would like to acknowledge the financial support from China Power International Holding Ltd.(ZGDL-KJ-2022-024);Postgraduate Research&Practice Innovation Program of Jiangsu Province(SJCX23_0179).

摘　　要：A novel Fe–Cr–Mo amorphous coating,a high-temperature corrosion-resistant material for water wall protection of power plant ultra-supercritical boilers,has been prepared via arc spraying.A systematic study was conducted to evaluate the high-temperature corrosion behavior of this coating,and its resistance to corrosion at high temperatures was scientifically assessed.The results indicate that the thickness of Fe–Cr–Mo amorphous coating is approximately 350μm,exhibiting typical amorphous characteristics as confirmed by X-ray diffraction and transmission electron microscope characterization.During each stage of the 750℃corrosion test,the oxygen content of the amorphous coating was significantly lower than that of the contrast coating(PS45 alloy coating),indicating a superior corrosion protection effect at high temperature.After 100 h of continuous testing,the corrosion mass gain of the amorphous coating was only 28.62%that of PS45 coating and 3.89%that of T12 steel substrate,indicating significantly depressed high-temperature corrosion kinetics.The excellent high-temperature corrosion resistance of Fe–Cr–Mo amorphous coating is primarily attributed to the stable Fe/Cr oxide film generated by the metastable state of the amorphous state,which serves as an excellent barrier.Furthermore,under the influence of heat in a high-temperature environment,the amorphous structure gradually transforms into a nanocrystalline structure.In contrast,the oxide film of the amorphous/nanocrystalline coating has low thermal stress,leading to better adhesion with the coating and resistance to cracking and peeling,thus providing excellent sustained protection.

关 键 词：Fe–Cr–Mo amorphous coating Microstructure characteristics High-temperature corrosion Anti-corrosion performance Mechanism 

分 类 号：TG174.4[金属学及工艺—金属表面处理]