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12-09-2011, 09:47 AM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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Corrosion?
I've been storing my HS from the ceiling of my garage for about a year. When I pulled it down this morning I saw this on the upper surface
It won't wipe off or wash off. Comes off easily with a little rubbing compound.
Should I leave this? Is it OK to compound off? Thoughts?
Thanks,
Tom
Last edited by Av8torTom : 12-09-2011 at 10:10 AM.
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12-09-2011, 11:05 AM
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Join Date: Jun 2005
Posts: 846
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etch and alodine
you could scotchbright and etch and alodine it
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12-09-2011, 11:23 AM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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Anyone else?
Is anyone else experiencing this?
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12-09-2011, 12:13 PM
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Join Date: Jan 2010
Location: Hampshire, IL
Posts: 276
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I've run into this polishing planes for customers years ago. I would wash it off with a aluminum prep then polish. Going this route you will know for sure all surface corrosion is gone before prepping and painting.
__________________
Ed Martin
Bluskydtl
RV7
DKB
Donations 1/19 & 6/19
Last edited by N9331v : 12-09-2011 at 12:26 PM.
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12-09-2011, 12:52 PM
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Join Date: Feb 2006
Posts: 81
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I had the same thing since; but I assumed it was due to my build being stretched over 8 years and the parts were stored in some humid Hawaiian weather. I was surprised to see it since the 2024 alcad on the surface should be T-0 (annealed and not suceptable to corrosion). Scotchbrite or some other physical process seems best. Don't do what I did and next apply WD40 to the surface because it can seep into the rivet to skin gap and may not not be completely removed during the painting prep processes. Paint doesn't like WD40.
__________________
Greg Grigson
Yellow Peril / RV-6A SOLD
Albuquerque, New Mexico
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12-09-2011, 01:17 PM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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I agree
Greg - I'm even hesitant to use rubbing compound for that reason. There's no silicone in it, but there is mineral oil. I just finished the left wing and I'm now concerned the same will happen to it. Is there anything I can do to prevent it?
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12-09-2011, 01:50 PM
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Join Date: Feb 2006
Posts: 81
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Maybe the RV Community has some suggestions
I don't know how to prevent it-other than leave the plastic on as long as possible. Perhaps the question should really be: Is it doing any harm? Most oxides form a protective barrier to prevent more corrosion--problem solved.
I would defer to someone smarter than me to confirm this for our Alclad sheets. Anyone?
__________________
Greg Grigson
Yellow Peril / RV-6A SOLD
Albuquerque, New Mexico
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12-09-2011, 06:27 PM
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Join Date: Mar 2006
Location: Dardanup. Western Australia
Posts: 167
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Quote:
Originally Posted by Av8torTom
Greg - I'm even hesitant to use rubbing compound for that reason. There's no silicone in it, but there is mineral oil. I just finished the left wing and I'm now concerned the same will happen to it. Is there anything I can do to prevent it?
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Sure is, Acid wash it with Alumiprep, Alodine and prime it NOW. Problem solved... |
12-09-2011, 08:05 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,668
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Or wipe it down with some Boeshield, ACF-50, Corrosion X, or LPS 3, that should prevent any futher progression until you get around to painting.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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12-09-2011, 08:14 PM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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Paint?
Walt,
All of those products sounds like they are also lubricants. Won't they interfere with future paint adhesion?
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