Corrosion Mechanisms of 304L NAG in Boiling 9M HNO 3 Containing Cr (VI) Ions

Shagufta Khan (), Adil Saeed (), Mian Hammad Nazir, Muhammad Usman Abdullah and Zulfiqar Ahmad Khan
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Shagufta Khan: Zeefam Technologies and Scientific Solutions, Pune 412114, India
Adil Saeed: NanoCorr, Energy & Modelling (NCEM) Research Group, Bournemouth University, Poole BH12 5BB, UK
Mian Hammad Nazir: Faculty of Computing, Engineering and Sciences, University of South Wales, Caerleon CF37 1DL, UK
Muhammad Usman Abdullah: NanoCorr, Energy & Modelling (NCEM) Research Group, Bournemouth University, Poole BH12 5BB, UK
Zulfiqar Ahmad Khan: NanoCorr, Energy & Modelling (NCEM) Research Group, Bournemouth University, Poole BH12 5BB, UK

Sustainability, 2023, vol. 15, issue 2, 1-16

Abstract: In this research, the mechanisms of end-grain corrosion of 304L NAG tubes in boiling 9M HNO 3 -containing Cr (VI) ions are reported to sustainably manage the corrosion of nuclear fuel reprocessing plant components. Specific heat treatments were applied to as-received specimens to produce phosphorus and/or sulphur intergranular segregation. End-grain corrosion on heat-treated specimens and the effect of a Cr (VI) concentration on a 304L NAG tube (as-received) were investigated. It has been reported that an increase in Cr (VI) ions leads to the acceleration of end-grain corrosion due to high electrochemical potential. After systematic heat treatments on the 304L NAG specimens, it is concluded that the primary causes of heat-induced end-grain corrosion are phosphorus or sulphur segregation to the grain boundaries. The key findings of this research are highly significant in terms of understanding the corrosion mechanisms and controlling the end-grain corrosion of NAG steel in boiling HNO 3 environments. This research will help to sustainably reduce power plant maintenance costs and will have a significant impact on the delivery of long-term, clean, secure, and tenable energy.

Keywords: acid corrosion; intergranular corrosion; elemental segregation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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