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Old 8 Aug 2009, 10:00 PM   #1 (permalink)
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Strange result for practical

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I have an experiment where magnesium is wrapped around a nail and placed in a petri dish filled with agar/saltwater and indicators to locate anode and cathode. The nail does not corrode beacuse its oxidation reaction has been stifled. Only query is: a white substance has formed around the magnesium on the nail. Magnesium oxide possibly? anyways, what is it, and why is it there? how is this combatted in industrial Mg anodes?
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Old 11 Aug 2009, 11:05 AM   #2 (permalink)
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Re: Strange result for practical

Hi

I think its probably magnesium hydroxide.
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Old 29 Aug 2009, 9:24 PM   #3 (permalink)
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Re: Strange result for practical

Yep. I think itd be magnesium Hydroxide. My guess is that the experiment has been set up for some time?

Magnesium is a pretty reactive metal as you know. Although, it is also a self-passivating metal, thus the outer oxide layer neutralises its reactivity. But it seems as though somehow, the agar/saltwater has disintegrated its outer oxide layer, so it readily reacts with hydroxide ions in water.
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