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The role of niobium carbides in the localised corrosion initiation of 20Cr-25Ni-Nb advanced gas-cooled reactor fuel cladding
Corrosion Science, Volume: 165, Start page: 108365
Swansea University Authors:
Justin Searle , Geraint Williams
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DOI (Published version): 10.1016/j.corsci.2019.108365
Abstract
The role of niobium carbide (NbC) inclusions in directing the initiation of localised corrosion in sensitised 20Cr-25Ni-Nb stainless steel is investigated using a range of in-situ scanning techniques, allowing visualisation of corrosion behaviour over multiple length scales. Volta potential mapping...
Published in: | Corrosion Science |
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ISSN: | 0010-938X 1879-0496 |
Published: |
Elsevier BV
2020
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Online Access: |
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URI: | https://cronfa.swan.ac.uk/Record/cronfa52970 |
Abstract: |
The role of niobium carbide (NbC) inclusions in directing the initiation of localised corrosion in sensitised 20Cr-25Ni-Nb stainless steel is investigated using a range of in-situ scanning techniques, allowing visualisation of corrosion behaviour over multiple length scales. Volta potential mapping shows NbC inclusions are up to 30 mV noble to the matrix, while chromium-depleted grain boundaries are up to 65 mV less noble. Corrosion initiation, shown by scanning vibrating electrode technique to comprise highly localised anode sites, is observed at grain boundaries, adjacent to the location of NbC inclusion clusters which remain unaffected by anodic dissolution of the surrounding matrix. |
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Keywords: |
A Stainless steel; B AFM; B SEM; C Intergranular corrosion; C Pitting corrosion; C Inclusion |
College: |
Faculty of Science and Engineering |
Funders: |
We would like to acknowledge the Nuclear Decommissioning Authority for providing PhD funding. Financial support is also acknowledged from EPSRC and the European Social Fund through the Materials and Manufacturing Academy Centre for Doctoral Training at Swansea University. Westing house are thanked for supplying the sample material. |
Start Page: |
108365 |