Research Progress on Liquid LBE/Pb Corrosion of FeCrAl Alloys
MA Liangyi1,2, TAI Pengfei1,3, WANG Zhiguang1,2,3, PANG Lilong1,2,3, SHEN Tielong1,2,3, YAO Cunfeng1,2,3, LI Jing1,2
1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China 2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 3 Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516000,Guangdong, China
Abstract: Lead-bismuth eutectic (LBE) has become the preferred coolant material for accelerator driven subcritical system (ADS) and lead-cooled fast reactor (LFR) due to its good physical properties and low chemical activity. However, LBE at high temperature can cause degradation of structural materials properties. FeCrAl alloys, with excellent high temperature resistance, corrosion resistance and mechanical properties, can just play a promising role in structural materials. Although a lot of research had been done about corrosion behaviors and mechanism of FeCrAl alloy in LBE, it failed to form a systematic evaluation method of FeCrAl alloy corrosion due to complex influencing factors. Furthermore, the detailed description of the corrosion mechanism of FeCrAl alloys under different conditions is lacking and the improvement of its corrosion resistance has attracted more attention as well. Since oxygen concentration in LBE/Pb, environment temperature and element content are the key factors that affect the corrosion process of FeCrAl alloys, researchers recently have done numerous experimental studies and theoretical simulations in a wide temperature range (400—900 ℃) and oxygen concentration of 10-3%—10-8%(mass fraction). Based on a large amount of data, the ternary phase diagram has been drawn, where the composition range of the FeCrAl alloy resistant to LBE corrosion is identified. The results revealed that the formation of a dense and continuous oxide layer on the surface of the FeCrAl alloys was the key to the materials corrosion resistance at the proper oxygen concentration and temperature. The conditional boundary diagram of the oxide layer formation has also been drawn at different temperatures and element contents. Furthermore, two main ways have been proposed to improve the corrosion resistance of structural materials. One is theⅡ phase FeCrAl alloys modulated by adding trace elements based on FeCrAl(Y). The other is FeCrAl alloys coatings prepared on mature materials (such as 316L, T91, etc.). This paper first briefly introduced elemental constituent, structure, conventional properties and development status of FeCrAl alloys with excellent LBE/Pb corrosion resistance. Then several important factors that can significantly affect LBE/Pb corrosion process, such as oxygen concentration in LBE/Pb, environment temperature, alloy elements and coatings preparation technique, were summed up based on the experimental studies. The effect of corrosion on the mechanical property, one of the most severe problems for FeCrAl alloys in high temperature liquid LBE/Pb, was mentioned. Subsequently, the mechanism of LBE/Pb corrosion-resistant of FeCrAl alloys, existing problems and possible measures to improve the corrosion resistance of the materials were discussed.
马良义, 台鹏飞, 王志光, 庞立龙, 申铁龙, 姚存峰, 李靖. FeCrAl合金的液态LBE/Pb腐蚀研究进展[J]. 材料导报, 2022, 36(7): 20100178-6.
MA Liangyi, TAI Pengfei, WANG Zhiguang, PANG Lilong, SHEN Tielong, YAO Cunfeng, LI Jing. Research Progress on Liquid LBE/Pb Corrosion of FeCrAl Alloys. Materials Reports, 2022, 36(7): 20100178-6.
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2022, Vol. 36 
