Copper corrosion and its inhibition are often associated with the presence of oxide films. Several studies have demonstrated that copper oxide films, which are normal corrosion products, protect copper substrate from further corrosion. However, little work has been carried out on the chemical formation of copper oxide films. On the other hand, the development of new polymer coatings is needed for corrosion prevention in aggressive environment. Although interest in the use of polypyrrole films for corrosion prevention has arisen recently, no successful utilisation of the polymer for control of copper corrosion has been reported, due to the difficulty in the deposition of the polymer. In this study, two new surface modification techniques, namely chemical formation of copper oxide films and the electrodeposition of polypyrrole on copper, have been developed to address the above issues. The influence of bicarbonate ions on the stability of copper oxide films and pitting corrosion were studied. Various approaches for the electrodeposition of polypyrrole (PPy) film onto copper substrate were investigated. The characteristics and properties of PPy films, particularly for the film formed in sodium tetraborate solution, were investigated. The redox reactions of copper substrate were inhibited completely by the presence of the polypyrrole film, formed in sodium tetraborate solution, in several weak alkaline solutions. The electrochemical behaviour of the Cu-PPy electrode is quite similar to Cu electrode in the presence of an effective corrosion inhibitor, such as benzotriazole, in several solutions. These properties of the PPy film clearly indicate that there is potential for the application of the polymer in the control of copper corrosion. / Doctor of Philosophy (PhD)
| Identifer | oai:union.ndltd.org:ADTP/235883 |
| Date | January 1995 |
| Creators | Duan, Yvonne Yanwen, University of Western Sydney, Nepean, Faculty of Science and Technology |
| Source Sets | Australiasian Digital Theses Program |
| Language | English |
| Detected Language | English |
| Source | THESIS_FST_XXX_Duan_Y.xml |
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