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Magnetic resonance imaging of copper corrosion

Abdullahi, Ismaila (2014)
M.Res. thesis, University of Birmingham.

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Abstract

This research project studied the corrosion of copper in 0.5 M sodium chloride and 1.5 % w/v agar using magnetic resonance imaging (MRI).
The imaging artefacts frequently associated with metals in the MRI were minimised in the copper corrosion system by aligning the copper strip in the cell parallel to the radio-frequency field of the spectrometer.

T\(_1\) and T\(_2\) relaxation measurements of varying copper concentrations in 0.5 M sodium chloride and 1.5 % w/v agar show that the relaxation rate of proton water molecules increase with increasing copper concentration in the control samples. Diamagnetic contributions from other species apart from copper ions to the relaxivity of proton water molecules in the system were also observed.

MRI was used to map spatial distribution and concentration of copper ions in electrolyte solution of sodium chloride for the first time. A time series of T\(_2\) maps of the system show reduction in spin-spin relaxation times during the corrosion process, which was attributed to increase in the concentration of copper ions in the electrolyte solution near the metal. Also, a time series of T\(_2\) maps revealed the spatial distribution of copper ions during the process of copper corrosion. The T\(_2\) concentration maps also showed how the concentration of copper ions increases as they are spatially distributed during the process. A time series of T\(_1\) maps does not show any significant variation in T\(_1\) times during the corrosion process. This was attributed to the corrosion products formed in the system.

Type of Work:M.Res. thesis.
Supervisor(s): Britton, Melanie
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemistry
Subjects:QD Chemistry
Institution:University of Birmingham
ID Code:4952
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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