RESEARCH ON METAL COMPATIBILITY OF MOLTEN SALT THERMAL STORAGE MATERIALS FOR SOLAR THERMAL POWER GENERATION

Wang Jinlong; Lu Yuanwei; Wu Yuting; Zhang Cancan

doi:10.19912/j.0254-0096.tynxb.2022-1939

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (4) : 540-545. DOI: 10.19912/j.0254-0096.tynxb.2022-1939

RESEARCH ON METAL COMPATIBILITY OF MOLTEN SALT THERMAL STORAGE MATERIALS FOR SOLAR THERMAL POWER GENERATION

Wang Jinlong, Lu Yuanwei, Wu Yuting, Zhang Cancan

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Abstract

In order to analyze the compatibility between the molten salt of the third generation solar thermal power generation technology and the materials of cryogenic tank,this article takes a mixed molten salt with low melting point （142 ℃） and high decomposition temperature （>700 ℃） as the corrosion environment,and studies the corrosion behavior of carbon steel （A515Gr70） and two low alloy steels （Q345R,15CrMoR） in the mixed molten salt at 450 ℃ through static corrosion experiments. The weight-loss method is adopted to measure the corrosion rates of different metals. The microstructure, phase composition and micro-area composition of the metal corrosion surface are analyzed by SEM, XRD and EDS. The results show that carbon steel does not contain corrosion resistant elements Cr, Ni and Mo,and the corrosion rate is the highest.The oxide layer on the surface of 15CrMoR is mainly composed of porous Fe₂O₃,which cannot prevent molten salt from immersing into the metal matrix,resulting in increased oxidation and poor corrosion resistance.The oxide layer on the surface of Q345R is composed of FeCr₂O₄, NiO and TiO₂ with good compactness, which has a protective effect on the metal matrix and has the best corrosion resistance.

Key words

solar thermal power generation / corrosion / corrosion rate / alloy steel / molten salt / oxide layer

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Wang Jinlong, Lu Yuanwei, Wu Yuting, Zhang Cancan. RESEARCH ON METAL COMPATIBILITY OF MOLTEN SALT THERMAL STORAGE MATERIALS FOR SOLAR THERMAL POWER GENERATION[J]. Acta Energiae Solaris Sinica. 2024, 45(4): 540-545 https://doi.org/10.19912/j.0254-0096.tynxb.2022-1939

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