What is it about?
We studied a type of pitting corrosion that may occur in the tubing material used in nuclear steam generators during plant outages. Steam generators are preserved in wet lay-up conditions. Chloride and thiosulfate ions that accumulated in crevices during operation may produce a particular type of pitting corrosion during the plant outage. Tested conditions simulate those of wet lay-up. We report the precise conditions where localized corrosion occur in Inconel 600 and 690, and Incoloy 800.
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Why is it important?
This is a relevant phenomenon that may affect PWR and CANDU nuclear power plants
Perspectives
In previous articles, we reported for the first time the occurrence of low potential pitting corrosion of nickel alloys under conditions that resemble those during plant outages. Here, we demonstrate that this phenomenon may occur during wet lay-up of steam generators provided that chloride and thiosulfate are present in a certain concentration range.
Dr Martín A Rodríguez
Comision Nacional de Energia Atomica
Read the Original
This page is a summary of: Pitting corrosion of Ni-Cr-Fe alloys at open circuit potential in chloride plus thiosulfate solutions, Corrosion Science, April 2022, Elsevier,
DOI: 10.1016/j.corsci.2022.110121.
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