Dissolution Behavior of M5 Cladding in Hydrofluoric-Nitric Mixed Acid.

ABSTRACT: M5 cladding has emerged as a prominent fuel cladding material due to its excellent corrosion resistance. The dissolution behavior of M5 cladding is critical in both the initial cleaning stage and the reprocessing of spent fuel cladding. This study investigated the dissolution of M5 cladding in hydrofluoric-nitric (HF-HNO₃) mixed acid at varying concentrations. When the HF concentration exceeds 0.5 mol/L, the addition of strong oxidizing HNO₃ significantly reduces the dissolution rate. Moreover, HNO₃ effectively inhibits the HF-induced corrosion pitting, lowering surface roughness to 0.812 μm at a 1:5 ratio of HF:HNO₃. In addition, a surface structural analysis reveals the dissolution mechanism of M5 cladding. The β-Nb precipitated in the mixed ac

SUBMITTER: Chen Y 

PROVIDER: S-EPMC11642294 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature