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Alkaline Conditions - Curtin Policy on Plagiarism - Engineering Assignment Help
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Assignment Task:
Alkaline Conditions
1. Mild steel is typically used as a material of construction due to its low cost. It has a tendency to form passive film (Fe2O3 or Fe3O4) at alkaline conditions. Applications of mild steel in high alkalinity include reinforcement under concrete (typical pH 12-13).
1.1 One of the failure mechanisms for reinforced concrete is called “carbonation” where CO2 dissolved in the pores water leading to a decrease in pH. Using the Pourbaix diagram developed, identify the threshold pH below which the passive film is likely to become unstable. Assuming all ionic species concentration is 10-6 M and the operating potential is -0.35 to -0.4 VCu/CuSO4.
1.2 Demonstrate the changes in threshold pH if [Fe2+] decreases to 10-8M. Reactions equilibrium and Nernst equations are given below
3. Three polarization below curves were obtained on the stainless steel UNS S31603 under the same temperature but at different chloride concentrations. Provide qualitative interpretation in your own words based on the appearance of the curves.
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