HOMETASK: An Al-1% Mn alloy immersed in 0.1 M sodium citrate solution (pH3.5) for 24 h displayed an electrode potential of -1.25Vvs . SCE. What behavior is expected in terms of corrosion, passivity,or immunity? What assumptions are you making in your analysis?

The correct answer is: The Al-1% Mn alloy is expected to display passivity in the given conditions.<br /><br />Explanation:<br />In this scenario, the Al-1% Mn alloy is immersed in a 0.1 M sodium citrate solution with a pH of 3.5 for 24 electrode potential of the alloy is measured to be -1.25 V vs. SCE (Standard Calomel Electrode).<br /><br />Based on the given information, we can make the following assumptions:<br /><br />1. The sodium citrate solution acts as a complexing agent, which can form stable complexes with the aluminum and manganese ions, preventing their direct interaction with the electrolyte.<br />2. The pH of the solution is 3.5, which is acidic. In acidic conditions, aluminum tends to form a protective oxide layer on its surface, which can act as a barrier to corrosion.<br />3. The electrode potential of -1.25 V vs. SCE indicates that the alloy is in a passive state. In a passive state, the alloy is not actively corroding, but it may still be susceptible to localized corrosion under certain conditions.<br /><br />Considering these assumptions, the Al-1% Mn alloy is expected to display passivity The protective oxide layer formed on the aluminum surface and the complexing action of the sodium citrate solution contribute to the passivity of the alloy. This means that the alloy is not actively corroding, but it may still be susceptible to localized corrosion under certain conditions.