Abstract
The redox behavior of Cr(II)/Cr(III) and Cr(II)/Cr in an 873 K NaF-BeF2 (FNaBe) melt are electrochemically investigated using cyclic voltammetry (CV), square wave voltammetry (SWV), stripping chronopotentiometry (SCP), and chrono amperometry (CA). The formal standard potential for these two redox reactions is determined to be 1.457 and 1.486 V vs Eeq,Be(II)/Be. The potential of utilizing Cr(II) as a corrosion inhibitor for 316H stainless steel (316HSS) in FNaBe melt is evaluated from thermodynamic perspective by setting Esalt≤Eeq,Cr(II)/Cr316. The results indicate that effective inhibition of 316HSS corrosion can be achieved when CCr(II) ≥ 0.429CCr(III)2/3. Experimental studies are conducted to explore the corrosion of 316HSS in the FNaBe-Cr(III)/Cr(II) melt, and the results align with the thermodynamic evaluation.
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