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The chloride induced localised corrosion of aluminium and beryllium : a study by electron and x-ray spectroscopies.

Mallinson, Christopher F. (2015) The chloride induced localised corrosion of aluminium and beryllium : a study by electron and x-ray spectroscopies. Doctoral thesis, University of Surrey.

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Abstract

Beryllium is an important metal in the nuclear industry for which there are no suitable replacements. It undergoes localised corrosion at the site of heterogeneities in the metal surface. Corrosion pits are associated with a range of second phase particles. To investigate the role of these particles in corrosion, a safe experimental protocol was established using an aluminium alloy as a corrosion material analogue. The 7075-T6 alloy had not previously been investigated using the experimental methodology used in this thesis. This work led to the development of the experimental methodology and safe working practices for handling beryllium. The range and composition of the second phase particles present in S-65 beryllium billet were identified using a combination of SEM, AES, EDX and WDX. Following the identification of a range of particles with various compositions, including the AlFeBe4 precipitate which has been previously associated with corrosion, the location of the particles were marked to enable their repeated study. Attention was focused on the microchemistry in the vicinity of second phase particles, as a function of immersion time in pH 7, 0.1 M NaCl solution. The corrosion process associated with different particles was followed by repeatedly relocating the particles to perform analysis by means of SEM, AES and EDX. The use of traditional chlorinated vapour degreasing solvents on beryllium was investigated and compared to two modern commercially available cleaning solutions designed as drop-in replacements. This work expanded the range of solvents suitable for cleaning beryllium and validated the conclusions from previous thermodynamic modelling. Additionally, a new experimental methodology has been developed which enables the acquisition of chemical state information from the surface of micron scale features. This was applied to sub-micron copper and iron particles, as well as a copper intermetallic

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
AuthorsEmailORCID
Mallinson, Christopher F.c_mallinson@msn.comUNSPECIFIED
Date : 15 December 2015
Funders : AWE Aldermaston
Contributors :
ContributionNameEmailORCID
Thesis supervisorWatts, J.F.j.watts@surrey.ac.ukUNSPECIFIED
Thesis supervisorBaker, Mark A.m.baker@surrey.ac.ukUNSPECIFIED
Thesis supervisorCastle, J.E.j.castle@surrey.ac.ukUNSPECIFIED
Thesis supervisorHarvey, A.ann.harvey@awe.co.ukUNSPECIFIED
Depositing User : Christopher Mallinson
Date Deposited : 12 Jan 2016 08:57
Last Modified : 12 Jan 2016 08:57
URI: http://epubs.surrey.ac.uk/id/eprint/809467

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