RESEARCH ON CORROSIVITY OF NEW WIDE TEMPERATURE RANGE MIXED MOLTEN SALTS

Gao Qi; Lu Yuanwei; Han Xinlong; Ma Yancheng; Jia Jiwei; Wu Yuting

doi:10.19912/j.0254-0096.tynxb.2024-0720

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 626-631. DOI: 10.19912/j.0254-0096.tynxb.2024-0720

RESEARCH ON CORROSIVITY OF NEW WIDE TEMPERATURE RANGE MIXED MOLTEN SALTS

Gao Qi, Lu Yuanwei, Han Xinlong, Ma Yancheng, Jia Jiwei, Wu Yuting

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Abstract

In order to investigate the corrosivity of metalicl materials at high temperatures in two new wide temperature range mixed molten salts, the paper studied the corrosion behavior of 316L stainless steel in two new wide-temperature range mixed molten salts using the weight loss method. The results showed that, over a period of 1000 h, the corrosion rates of 316L stainless steel in solar salt, quaternary nitrate-nitrite mixed salt and ternary nitrate-carbonate mixed salt were 0.0121, 0.0290 and 0.0900 mm/a, respectively, and the corrosivity of ternary nitrate-carbonate mixed salt was greater than that of solar salt and quaternary nitrate-nitrite mixed salt. The results of microscopic characterization and product analysis on 316L stainless steel samples after corrosion testing showed that 316L stainless steel corrodes in ternary nitrate-carbonate mixed salt with the formation of loose and porous NaFeO₂, which leads to increased corrosion of stainless steel.

Key words

solar thermal power generation / molten salt / corrosion behavior / stainless steel / corrosion rate / oxide film

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Gao Qi, Lu Yuanwei, Han Xinlong, Ma Yancheng, Jia Jiwei, Wu Yuting. RESEARCH ON CORROSIVITY OF NEW WIDE TEMPERATURE RANGE MIXED MOLTEN SALTS[J]. Acta Energiae Solaris Sinica. 2025, 46(9): 626-631 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0720

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