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Michael Valentine
Joined: 09 Jan 2006
Posts: 108
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 Posted: Tue May 23, 2006 6:26 pm Post subject: Filliform Corrosion |
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Listers,
A few months back, there was a mention of filliform corrosion. I have
wing skins that have sat for a couple years and now have light
corrosion. When I heavily scuff them up with scotchbrite (green, btw)
it takes off the whitish, obvious corrosion. But, when I wipe it down
you can still see the shadow of the corrosion.
You can see filliform corrosion here
http://homepage.mac.com/csteiner/PhotoAlbum9.html and similar pictures
posted by Dan Morehouse at
<http://www.matronics.com/photoshare/messydeer(at)yahoo.com.02.11.2006/>
Dan's pictures show the shadows in the "Blendex Only" photo.
I don't recall from that discussion whether people believed the
corrosion was "dead" at that point, or whether one should do more.
Dan obviously did more. I don't have Alumiprep or ACF50 (discussed in
a post by Jim Weston), though I could obviously pick some up
somewhere. I plan on applying Cortec after the preparation, though I
was only going to do contact surfaces, not the complete skin. Will
the Cortec be sufficient to stop the spread?
Note - I am not a perfectionist, I am a builder! If it means the skin
needs to be replaced in 20 years instead of 40, and the steps
necessary to truly kill the corrosion involves lots of time and
chemicals, then I would opt for 20.
Any suggestions?
Thanks, Michael Valentine
BTW, thanks all for the advice on the pneumatic riveter - a few drops
of oil did the trick.
do not archive
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pacificpainting(at)comcas
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| Posted: Tue May 23, 2006 6:55 pm Post subject: Filliform Corrosion |
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Michael,
It's interesting that you posted this question. I just sent a similar one to
the Aeronca group, of which I am also a member. I left my slat and flaperon
kit for my 801 unopened and outside. Although covered up, it drew enough
dampness to be wet on the metal and the paper that it was wrapped in. This
happened in only a month. The metal is grayish and not shinny where the
pieces were touching. I thought maybe scotchbrite and either primer or ACF
50 or Corrosion X. I to am interested in other ideas for a solution.
Dave in Salem
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planes_by_ken(at)bellsout
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| Posted: Thu May 25, 2006 11:24 am Post subject: Filliform Corrosion |
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Use ACF50 or Corrosion X about 6 months after painting and every 2 years
after that. It is an interior corrosion treatment that works itself
between all parts. Alodine will "kill" corrosion. Mechanically clean
the area first, apply the cleaner, wash, apply the Alodine and wash.
Repaint as required.
Ken Lilja
Instructor, Aviation Institute of Maintenance
Dave Ruddiman wrote:
[quote]
Michael,
It's interesting that you posted this question. I just sent a similar one to
the Aeronca group, of which I am also a member. I left my slat and flaperon
kit for my 801 unopened and outside. Although covered up, it drew enough
dampness to be wet on the metal and the paper that it was wrapped in. This
happened in only a month. The metal is grayish and not shinny where the
pieces were touching. I thought maybe scotchbrite and either primer or ACF
50 or Corrosion X. I to am interested in other ideas for a solution.
Dave in Salem
---
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