Abstract
The effect of SiO2 nanoparticles and flow rate on the corrosion behaviors of 304 and 316 L stainless steels in quaternary nitrate-nitrite (QNN) molten salt are comparatively investigated. The results show corrosion of 304 and 316 L specimens in QNN with nanoparticles are lower than that in QNN. Compared to the corrosion weight loss (mmass) in QNN with nanoparticles, the mmass of 304 and 316 L in QNN is separately increased by 25.2% and 60.4% at 2 m/s after 1000 h due to the sedimentation of the nanoparticles. Besides, the mmass of 304 and 316 L specimens in nanofluids at 2 m/s are individually 16.8% and 13.8% higher than those at 0.6 m/s. The flow rate can rarely affect the types of oxidation products from XRD analysis. Meanwhile, the Rdepth of 316 L specimens is 58.1% lower than that of 304 specimens at 2 m/s in QNN salts-based nanofluids after 1000 h test. This work could provide basic dynamic corrosion data for design and operation of concentrated solar power plants.
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