Originally posted by CrystalDipoleMatrix
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Just Alum is not all you need to get it not corroding the Mg. You will have to figure out how to stop the Alum from corroding the Mg at a substantial level.
Think like how to stop the "acid" action of a Sulfuric Acid (H2SO4) so that it would not corrode a metal? Alum is just an means for locking "whatever you want" (like SO4 or water or 'corrosive elements to the metal in play') and on top of that Alum is conductive to "electricity" (in this case ions).
So you got your cell at half way correct you just added too much of the ingredients that improved corrosion process.
Cook out Alum will be water deficient and in a structure that is very crystaline (very, very hard) and incapable of absorbing water therefore you will have excess water in your cell which will eat up your Mg.
I have figure out a way to create Alum in a mix that makes it not crystaline neither watery.
Try a mix of Alum with a little bit of Sodium Silicate and add a bit of something that will help it to be consistent in form (may borax or epson salts - my favorite - and so on). This new mix of Alum in your exact same cell will have a much longer lasting time. You can see if for yourself.
Fausto.
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