chromium - 21-11-2005 at 06:24
What is that metal into wich modern alkaline cells are encapsulated?
I thought it is Zn but it does not react with NaOH solution. At least i do not see any bubbles ( piece of Zn-plated iron in same vessel reacts quite
well ) In the same reason it can not be Al. It does not atract to magnet so it can not be iron. It corrodes and is rather soft so it can not be
stainless steel. What the hell it is?
stygian - 21-11-2005 at 06:35
According to a quick google search, it's zinc. In a drained battery it would be zinc hydroxide
chromium - 21-11-2005 at 06:52
I do know it should be zinc but it is much less reactive. It does not react with NaOH solution, it does not react with 30% acetic acid in wich known
zinc bubbles quite well.
Metal from one particular brand of AA batteries even does not react with 40% sulfuric acid. From others does. Maybe its kind of zinc alloy? Does
anyone know what is composition of this alloy?
Eclectic - 21-11-2005 at 06:59
High purity zinc with 30-50 ppm Bi,Al,In
to prevent hydrogen production in the cell.
Used to be Zn with a trace of mercury.
S.C. Wack - 21-11-2005 at 14:21
It is a steel. Test for Fe.
BIA zinc in Eveready Alkaline Cells
Eclectic - 21-11-2005 at 14:43
http://tinyurl.com/a8wpq
"It should be appreciated that super high grade zinc is preferably of a high-grade quality containing a low amount of impurities, if any. In step
44, the zinc is uniformly mixed with bismuth, indium, and aluminum to form a zinc alloy, referred to herein as BIA zinc, according to one embodiment.
The individual quantities of bismuth, indium, and aluminum are typically between 50 ppm and 250 ppm. Examples of suitable alloys are disclosed in U.S.
Pat. No. 5,312,476. Step 44 may include melting the zinc ingots at a sufficient temperature, uniformly mixing the molten zinc with bismuth, indium and
aluminum, and blowing the molten mix through a nozzle to cool and produce BIA zinc powder."
The battery casing is steel.
jimwig - 22-11-2005 at 13:44
a magnet per se?