FeCrAl合金的液态LBE/Pb腐蚀研究进展

doi:10.11896/cldb.20100178

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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.

Key words： FeCrAl alloys LBE/Pb corrosion Al₂O₃ scale corrosion mechanism

Published: Online: 2022-04-07

CLC number:

TL341

Fund:General Project of the National Natural Science Foundation of China (12075292), Joint Fund of the National Natural Science Foundation of China (U1832206), and General Project of Natural Science Foundation of Guangdong Province, China (HNY20301GJT).

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	Articles by authors
	MA Liangyi
	TAI Pengfei
	WANG Zhiguang
	PANG Lilong
	SHEN Tielong
	YAO Cunfeng
	LI Jing

Cite this article:

MA Liangyi,TAI Pengfei,WANG Zhiguang, et al. Research Progress on Liquid LBE/Pb Corrosion of FeCrAl Alloys[J]. Materials Reports, 2022, 36(7): 20100178-6.

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http://www.mater-rep.com/EN/10.11896/cldb.20100178 OR http://www.mater-rep.com/EN/Y2022/V36/I7/20100178

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