Compatibility of low-temperature mixed nitrate and Q345R storage tank material

doi:10.19799/j.cnki.2095-4239.2023.0443

Abstract

Abstract:

To analyze the compatibility of low-temperature molten salt and the Q345R storage tank material for heat storage, this study uses the constant-temperature static corrosion method to investigate the corrosion properties of low-alloy steel Q345R in the low-melting point mixed molten salt at 450 ℃ The corrosion mass loss of the sample is measured, and the corrosion rate is calculated with the mixed molten salt. The corrosion kinetics curve of the Q345R material in molten salt is obtained from the 1000 h corrosion test. The corrosion behavior characterization of the Q345R samples in molten salt is measured through scanning electron microscopy, X-ray diffraction, and energy-dispersive spectroscopy. The results show that the corrosion weight loss of the Q345R material in mixed molten salt effectively follows the parabolic corrosion law with the corrosion time increase. Its annual corrosion rate is lower than that in solar salt under the same working temperature conditions. The structure and the composition of the corrosion oxidation products affect the corrosion properties of the Q345R material. The presence of the Cr and Ni elements in the Q345R sample leads to the production of the dense FeCr₂O₄ and MnCr₂O₄ corrosion products on the sample surface, which improves the corrosion resistance of molten salt. Meanwhile, the presence of Ca²⁺ in molten salt results in the CaFeO₄ corrosion product, which has an inhibitory effect on the corrosion. That is, the corrosiveness of low-temperature mixed molten salt to the Q345R material is lower. This work provides a basis for selecting storage tank materials for the practical application of low-temperature mixed molten salt in different fields.

Key words: low melting point, mixed nitrate, corrosiveness, storage tank

CLC Number:

Mingzhong WAN, Jinlong WANG, Yongan CHEN, Yuanwei LU, Yuting WU, Cancan ZHANG. Compatibility of low-temperature mixed nitrate and Q345R storage tank material[J]. Energy Storage Science and Technology, 2023, 12(10): 3099-3107.

Figures/Tables 10

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