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The atmospheric corrosion of 304L and 316L stainless steels under conditions relevant to the interim storage of intermediate level nuclear waste

Cook, Angus James McDonald Cartres (2018)
Ph.D. thesis, University of Birmingham.

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Abstract

The atmospheric corrosion of 304L and 3 16L austenitic stainless steels was investigated in conditions relevant to the storage of intermediate level nuclear waste (I L W). Thin electrolyte films were created via automated droplet deposition, allowing multiple tests to be conducted in parallel.

In-situ monitoring of droplet arrays on stainless steel samples was conducted with the use of a flat-bed document scanner, allowing large-scale, automated monitoring of corrosion processes. The initiation time for individual corrosion processes was established, showing that corrosion was slower to initiate under less aggressive conditions, and allowing 'true corrosion site lifetimes to be recorded, and compared with their depths.

The presence of precipitated species within an electrolyte film was shown to affect the corrosion processes within that film. Both NaCl precipitates and glass shards acted as barriers to ion transport. This affected both the propagation of corrosion, and the electrochemical potential within the droplets; a higher precipitate content decreased the average corrosion depth and the extent of corrosion.

The presence of nitrate and sulphate salts, both known corrosion inhibitors in full- immersion conditions, was shown to inhibit atmospheric corrosion when the inhibitor:chloride ratio was above a certain value. This was independent of the absolute amounts of salts, but dependent on the exposure humidity of the test.

Type of Work:Ph.D. thesis.
Supervisor(s):Davenport, Alison and Rayment, Trevor
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Additional Information:

Publications resulting from research:

Cook, A.J.M.C., C. Padovani, and A.J. Davenport, Effect of Nitrate and Sulfate on Atmospheric Corrosion of 304L and 316L Stainless Steels. Journal of The Electrochemical Society, 2017. 164(4): p. C148-C163.
http://dx.doi.org/10.1149/2.0921704jes

Subjects:TD Environmental technology. Sanitary engineering
TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:8112
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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