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jeff(at)westcottpress.com
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 Posted: Mon Mar 10, 2008 2:53 pm Post subject: Fuel Tank Corrosion |
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When I made my tanks... last May and June... I taped off the areas of
the skin that would be mated to the stiffeners and ribs with blue
painters tape. I roughened up the surface with scotch brite, cleaned
with aluma-prep and assembled with pro-seal. I left the baffle off
of the tanks as I was debating the installation of capacitance
senders instead of the floats. Over time (can't quite say how much)
I pulled up the painters tape.
So, I'm now ready to close up the tanks (with the floats) and find
that the right tank has a light corrosion in it... primarily under
the areas and at the edges of where the tape had been. I believe
this is both from the adhesive on the tape as well as my failure to
completely rinse the aluma-prep off in some areas. I can remove this
with a whole lot of elbow grease and a scotch brite pad. It comes up
a bit easier with aluma-prep and a scotch brite pad, but will then
run in to the nooks and crannies of the tank and create a new problem
somewhere else if I don't rinse quickly enough.
Will the presence of fuel in the tank act as corrosion protection and
keep this from progressing? Is this process something that stops
when the corrosive agent (the aluma prep, or the tape) is removed or
"used up," or is this a ball that once rolling won't stop?
Jeff Carpenter
40304
Scoth brite Hell
Awaiting your reply
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rnewman(at)tcwtech.com
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| Posted: Wed Mar 12, 2008 5:20 pm Post subject: Fuel Tank Corrosion |
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Jeff, I visited my hangar today to inspect my wings that have beeen in
storage. I had blue painters tape on a half a dozen places directly on
the aluminum. About 3 or 4 of the locations were tape directly on aluminum
that had the alclad buffed off. The other places had tape on undisturbed
alclad. None of the places showed any sign of corrosion. I know that we
can get some very humid conditions here, particularly when we have a very
cold day, followed by a warm day. On many occasions I find my airplane
completely covered in dew from the temperature swing through the dew point.
This is particularly prevalent this time of year as we transition out of
winter.
Best regards,
Bob Newman
TCW Technologies
www.tcwtech.com
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