Initiation and propagation of a single pit on stainless steel using a local probe technique

Experiments about single pit initiation and propagation were performed on 316L stainless steel with the aim to determine the pitting corrosion behaviour for nuclear waste containers. The experimental setup permits to control the pit development at will and to create reproducible single pits in three...

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Bibliographic Details
Published in:Faraday discussions 2015-01, Vol.180, p.267-282
Main Authors: Heurtault, Stéphane, Robin, Raphaël, Rouillard, Fabien, Vivier, Vincent
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Chemical Sciences
Chlorides
Constraining
Discs
Electrolytes
Evolution
Heat resistant steels
Other
Pitting (corrosion)
Stainless steels
Three dimensional
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Summary:Experiments about single pit initiation and propagation were performed on 316L stainless steel with the aim to determine the pitting corrosion behaviour for nuclear waste containers. The experimental setup permits to control the pit development at will and to create reproducible single pits in three dimensions. Radial and deep evolutions of a disc shaped pit were studied for propagation times of up to 10 hours. These evolutions were used to determine what limiting mechanism takes place during long-term pit propagation. Special attention has been paid to the chloride ion action on pitting. A minimum chloride concentration was found to be necessary in the bulk electrolyte to support pit propagation. The existence of a critical pit depth of 230 μm was also underlined.
ISSN:1359-6640
1364-5498
DOI:10.1039/C4FD00252K