Thesis Format
Integrated Article
Degree
Master of Science
Program
Chemistry
Supervisor
Prof. Samantha M. Gateman
Abstract
This thesis investigates the corrosion behaviour of copper, focusing on the impact of air-formed surface films and the effectiveness of cathodic cleaning procedures. Using macro and micro electrochemical techniques, the study assesses how surface finishing and film formation influence copper's corrosion resistance. Results indicate that rougher surfaces develop more protective films over 30 days, enhancing corrosion resistance. However, cathodic cleaning is not fully effective in reducing surface films, with its efficacy highly dependent on experimental conditions. The process also poses risks, such as hydrogen evolution, and is limited by the reformation of films during post-cleaning immersion. This research challenges existing assumptions about copper surface films and treatment, highlighting the need for refined methodologies to improve copper's long-term durability. These findings offer significant contributions to academic research and industrial practices in corrosion science, potentially guiding future advancements in corrosion prevention and material longevity.
Summary for Lay Audience
Copper is a versatile metal used in various industries, including electrical, construction, and nuclear sectors, due to its excellent corrosion resistance. In the nuclear industry, copper is crucial for constructing used fuel containers (UFCs), essential for safely storing nuclear waste underground as part of Canada’s future plans. When copper is exposed to air, a thin film forms on its surface, which can either protect the metal from further corrosion or, under certain conditions, fail to provide adequate protection. This study investigates how copper corrodes over time when exposed to air, focusing on natural films that form on its surface and the effectiveness of cleaning methods designed to remove these films.
The research introduced an approach to better understand the corrosion of copper surfaces covered by thin air-formed films by simulating droplet formation conditions. This method allows for a more accurate study of how these films and surface morphology affect copper over time, particularly relevant for long-term nuclear waste storage. The study found that rougher copper surfaces develop more protective layers, offering greater resistance to corrosion than smoother surfaces over 30 days of air exposure.
However, the study revealed that the cleaning process, known as cathodic cleaning—a method involving the application of an electric current—may not always be effective. It can sometimes be detrimental to copper surfaces by generating hydrogen gas, possibly changing the surface and weakening the structure. These findings suggest that current cleaning methods may need to be revised to improve the accuracy of corrosion measurements and enhance the durability of copper.
These insights are vital not only for the nuclear industry but also for any application where copper’s longevity and reliability are essential.
Recommended Citation
Shafiee, Ghazal, "Investigating Atmospheric Corrosion of Copper and the Role of Cathodic Cleaning in Nuclear Waste Containment Applications" (2024). Electronic Thesis and Dissertation Repository. 10465.
https://ir.lib.uwo.ca/etd/10465
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