Holy crude, man. You do NOT want to use aluminum in a cell, at all.
Personal experience is where I will tell you that it will not last long or with good results. My first cell was in an aluminum fire extinguisher housing. It took about 20 hours to burn thru, but when it did, it was bad. 100% start over! As well, it was worse when my intake had corrosion in it from the contaminated gases getting thru the bubbler. I made a few mistakes at first, but learned very quickly to read up more before throwing another cell together. Please believe, YOU want to get the aluminum out of the cell asap ! Then cleanse it of oxidation well.
Before I feel too stupid. Are the aluminum plates in any way in the water solution ? Or not ?
Its done right or its not done !
Hail HHO.