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Aluminum (E Al3+/Al ° = ?2.07 V) is more easily oxidized than iron (E Fe3+/Fe ° = ?0.477 V), and yet whenboth are exposed to the environment, untreated aluminum has very good corrosion resistance while the corrosion resistance of untreated iron is poor. Explain this observation.
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Chemistry 102
Chapter 17
Electrochemistry
Carleton College
Drexel University
University of Maryland - University College
Brown University
Lectures
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okay. So usually when we're comparing a pair of metals and deciding which one corrodes our oxidize faster, we look at the reduction potentials or their oxidation potentials. So ah, hire oxidation potential would mean the metal is more likely dogs ice, hence the name oxidation potential. And we know that the reduction potential is just the negative value of the oxidation potential, or vice versa. So if you want, if ah higher arc station potential corrodes faster, then a lower reduction potential crude faster and aluminum does have a low reduction potential than iron, so it should have corrode faster. But in fact it doesn't. That's corrosion. Resistance and iron corrodes faster, and I want to know why. And there's not really a mathematical mathematical there. We go explanation for this, but I think I can draw it out and have you guys in context. So if we have this glob of aluminum and disposed to oxygen to the air, it will form this layer of up to the product of oxidation, which is aluminum oxide and most metals bill form this oxidant honor that you see the corroding like it's usually like a color that's coming. Rose may be old and aluminum, just a loan. Officer Ed. Here's really strongly to aluminum, so it forms. It's like perfect layer. If this was like all filled in, really been over the whole surface of the glob and that prevents any other oxidation, it just makes this night's cause the lake off, which usually happens. Nabulsi all stash she was. You see a chain and colors and like, especially touches. Yeah, but aluminum oxide said. Here's a way stronger to aluminum that any other model, including irons, are iron oxide. Um, so that is why aluminum oxidizes slower then.
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