Predicting corrosion of magnesium alloys with complex microstructure and reactivity

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The automobile industry is a key component of the Canadian economy. If this industry is to prosper while simultaneously reducing its environmental impact the development of non-gasoline powered vehicles with an economically viable range before recharging is required. One key way to achieve this is to reduce automobile weight. As a consequence, magnesium alloys have become a rapidly growing area of interest because of their low density and high-strength-to-weight ratio. However, one major issue limiting their extensive use in automobile applications is their susceptibility to corrosion when they are in contact with more stable materials such as carbon steel and aluminum. This project will investigate these corrosion issues using a combined experimental and modelling approach, and will lead to the development of novel experimental and modelling procedures. A primary goal will be the development of predictive models to determine the corrosion rates of various materials combinations. These models will offer guidance on corrosion issues to those involved in the development of specific casting and coating strategies and facilitate the more timely development of automobile components. To achieve these goals a team knowledgeable in the key areas of alloy casting, the microscopic characterization of materials, corrosion science and modern electrochemical techniques has been assembled. The multidisciplinary nature of the project will challenge individual researchers to expand their capabilities beyond their present levels. The project will be conducted in collaboration with the General Motors of Canada and its associated laboratories, where active research in this area is well underway.