AI Article Synopsis
- * Results show that when HF concentration is above 0.5 mol/L, adding nitric acid significantly slows down the dissolution rate and reduces corrosion pitting.
- * Surface analysis indicates that the dissolution mechanism involves the oxidation of β-Nb to stable NbO and the formation of a protective ZrO layer, which helps maintain the integrity of the M5 cladding.
Article 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-HNO) mixed acid at varying concentrations. When the HF concentration exceeds 0.5 mol/L, the addition of strong oxidizing HNO significantly reduces the dissolution rate. Moreover, HNO effectively inhibits the HF-induced corrosion pitting, lowering surface roughness to 0.812 μm at a 1:5 ratio of HF:HNO. In addition, a surface structural analysis reveals the dissolution mechanism of M5 cladding. The β-Nb precipitated in the mixed acid was oxidized to stable NbO by HNO while the M5 matrix surface was continuously oxidized to ZrO. This passivation layer inhibits further dissolution, slowing the process and enhancing the uniformity of M5 cladding.
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| http://dx.doi.org/10.3390/ma17235771 | DOI Listing |
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11642294 | PMC |
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