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Title: The electrogenerated chemiluminescent imaging of metals
Author: Barrett, Z. S.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2004
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This thesis details the characterisation and development of the luminol Electrogenerated Chemiluminescence (ECL) reaction to enable it to spatially resolve dissimilar metal compositions at a single conductive metal surface. The large difference in ECL emission from iron and tin has been exploited to detect penetrative defects in the surface of commercial tinplate and is presented in chapter 4. Reaction conditions are selected based on the data shown in the chapter 3 such that the exposed iron substrate emits ECL at a greater intensity than the surrounding intact tin coating. In this way the defects are rapidly exposed and can be photographed using an image intensified CCD camera. Chapter 5 continues on the theme of defect detection but describes the use of ECL in exposing failures in five types of commercial galvanised coatings. In a similar manner to tinplate the reaction is optimised such that the exposed substrate emits a much greater light intensity when compared to the zinc coating. Given the success of the technique at studying macro features, efforts were made to develop the process further to allow observation of micro features and in particular the copper rich phases present in AA2024-T3. Chapter 6 details the investigations made to optimise ECL for micro use. In chapter 7, the newly optimised technique is used to follow the dealloying and redistribution of copper at the surface of AA2024-T3 - an important aerospace alloy. Again the dissimilar emission phenomenon is exploited, this time from copper and aluminium. It is shown that the origin of surface copper when the alloy is dealloyed in NaCl is predominantly from the copper rich S-phase particles rather than the matrix.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Eng.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available