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 NaFeO
which leads to increased corrosion of stainless steel.
GROSU Y, BONDARCHUK O, FAIK A.The effect of humidity, impurities and initial state on the corrosion of carbon and stainless steels in molten HitecXL salt for CSP application[J]. Solar energy materials and solar cells, 2018, 174: 34-41.
FERNÁNDEZ A G, GALLEGUILLOS H, PÉREZ F J. Thermal influence in corrosion properties of Chilean solar nitrates[J]. Solar energy, 2014, 109: 125-134.
GOMES A, NAVAS M, URANGA N, et al.High-temperature corrosion performance of austenitic stainless steels type AISI 316L and AISI 321H, in molten Solar Salt[J]. Solar energy, 2019, 177: 408-419.
马丽娜. 高温熔盐腐蚀行为实验与理论研究[D]. 北京: 北京工业大学, 2022.
ZHANG X M, ZHANG C C, WU Y T, et al.Experimental research of high temperature dynamic corrosion characteristic of stainless steels in nitrate eutectic molten salt[J]. Solar energy, 2020, 209: 618-627.
WANG W L, GUAN B, LI X L, et al.Corrosion behavior and mechanism of austenitic stainless steels in a new quaternary molten salt for concentrating solar power[J]. Solar energy materials and solar cells, 2019, 194: 36-46.
FERNÁNDEZ A G, PÉREZ F J. Improvement of the corrosion properties in ternary molten nitrate salts for direct energy storage in CSP plants[J]. Solar energy, 2016, 134: 468-478.
BELL S, STEINBERG T, WILL G.Corrosion mechanisms in molten salt thermal energy storage for concentrating solar power[J]. Renewable and sustainable energy reviews, 2019, 114: 109328.
LIU Q Y, QIAN J, NEVILLE A, et al.Solar thermal irradiation cycles and their influence on the corrosion behaviour of stainless steels with molten salt used in concentrated solar power plants[J]. Solar energy materials and solar cells, 2023, 251: 112141.