AI Article Synopsis
- The corrosion behavior of 304 stainless steel was studied at 450 °C in both molten and vapor forms of NaNO-NaCl-NaF salt, revealing noticeable weight loss and the formation of surface oxides like FeO and FeCrO.
- A corrosion layer of about 1.1 μm was noted to be more homogeneous in molten salt, while in vapor, the oxide distribution was uneven with shedding issues attributed to gas presence affecting adhesion.
- The corrosion rate in molten salt was found to be nearly the same as that in solar salt, suggesting that the combined effects of Cl and F ions on corrosion are minimal, contributing valuable data for materials selection in Concentrated Solar Power (CSP) applications.
Article Abstract
Corrosion behavior of 304 stainless steel in molten NaNO-NaCl-NaF salt and NaNO-NaCl-NaF vapor has been studied at 450 °C. The results showed that the samples suffered weight loss, and surface oxides, FeO and FeCrO characterized by XRD, were formed after corrosion. The surface oxide layer was about 1.1 μm in thickness after corrosion in molten NaNO-NaCl-NaF salt, which was relatively homogeneous and dense. Whereas, the distribution of surface oxides was not even, and a shedding phenomenon was observed after corrosion molten NaNO-NaCl-NaF vapor. This is mainly attributed to the existence of NO and NO in the molten NaNO-NaCl-NaF vapor determined by thermogravimetric infrared spectroscopy, which affected the adherence between oxides and the matrix. Additionally, the corrosion rate of 304 stainless steel in molten NaNO-NaCl-NaF salt is almost close to that in solar salt, which demonstrates that the synergy influence of Cl and F on the rate of 304 stainless steel is not significant. This work not only enriches the database of molten salt corrosion, but provides references for the selection of alloy and molten salt in the CSP.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8982220 | PMC |
| http://dx.doi.org/10.1039/d2ra00364c | DOI Listing |
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