3 years ago

Hot corrosion behavior of commercial alloys in thermal energy storage material of molten MgCl2/KCl/NaCl under inert atmosphere

Hot corrosion behavior of commercial alloys in thermal energy storage material of molten MgCl2/KCl/NaCl under inert atmosphere
Alfons Weisenburger, Thomas Bauer, Hao Shi, Alexander Bonk, Yanlei Xiu, Adrian Jianu, Wenjin Ding
Hot corrosion behavior of three commercial alloys (stainless steel SS 310, Incoloy 800 H, Hastelloy C-276) in molten MgCl2/NaCl/KCl (60/20/20 mol%) under inert atmosphere was investigated by immersion tests at 700 °C for 500 h. SS 310 exhibited the highest corrosion rate, while Hastelloy C-276 showed the best corrosion resistance. All the studied alloys could not meet the requirements for commercial application (i.e., corrosion rate < 10 µm/year for 30 year's lifetime). Microstructural analysis on the exposed alloy specimens using SEM, EDX and XRD shows that Cr was dissolved preferentially than Fe and Ni to form a corrosion layer with a porous structure during the corrosion. Moreover, the corrosion products (e.g., MgO, MgCr2O4, etc.) precipitated on the surface of the exposed specimens, as well as in the pores of the Cr-depleted corrosion layer. For SS 310 containing 2 wt% Si, Si was also dissolved and corrosion products containing Si were observed in the pores of the corrosion layer. Based on these findings, an impurity-driven corrosion mechanism is proposed to describe the hot corrosion behavior of the studied alloys in molten MgCl2/NaCl/KCl under inert atmosphere, which could assist the development of corrosion mitigation technologies in future work.
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