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01-20-2015, 01:31 PM
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Join Date: Aug 2013
Location: Oslo, Norway
Posts: 40
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Corrosion on wings and fuselage ...
What is the procedure for removing corrosion that has come on the wings and fuselage during storage over many years on a QB kit?
Hope someone can answer this, I see there is a similar question here that is not answered.
__________________
RV enthusiast Helge Dypdalen -"dypen". EAA Chapter 573 Norway -member. Cessna 182S LN-EDB -flying. Van's RV-7 -planning to build. "Ready to Build?"
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01-20-2015, 01:52 PM
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Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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http://www.faa.gov/regulations_polic...cumentID/99861
Entire chapter devoted to corrosion and repair.
Typically, we see only General Surface Corrosion which is easily repaired with light abrasive or polish.
Most airframe manuals I have consulted allow for up to 10% loss of material. However, there is no specific published recommendation from Van's that I am aware of.
__________________
Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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01-20-2015, 02:32 PM
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Join Date: Aug 2013
Location: Oslo, Norway
Posts: 40
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Looks like it must be polished or sanded away, using chemicals should be unnecessary since there is no painted surfaces.
Quote:
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Elimination of corrosion by application of an organic film to metal surface.
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CHAPTER 6. CORROSION, INSPECTION & PROTECTION.pdf
__________________
RV enthusiast Helge Dypdalen -"dypen". EAA Chapter 573 Norway -member. Cessna 182S LN-EDB -flying. Van's RV-7 -planning to build. "Ready to Build?"
Last edited by dypen : 01-20-2015 at 02:35 PM.
Reason: Link ....
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01-20-2015, 03:02 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by dypen
Looks like it must be polished or sanded away, using chemicals should be unnecessary since there is no painted surfaces.
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Even if you don't alodine before painting, and acid etch step would remove any traces of corrosion in pits that sanding will not get to.
http://www.aircraftspruce.com/catalo...prep33tech.pdf
From the above document -
Brush Application:
For light oxidation and corrosion removal dilute one part ALUMIPREP
33 with five parts water.
For heavy oxidation and corrosion removal dilute one part ALUMIPREP
33 with two parts water.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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01-20-2015, 03:18 PM
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Join Date: Aug 2013
Location: Oslo, Norway
Posts: 40
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Thanks for the quick reply! After polishing / sanded it makes sense to clean and protect for good result 
__________________
RV enthusiast Helge Dypdalen -"dypen". EAA Chapter 573 Norway -member. Cessna 182S LN-EDB -flying. Van's RV-7 -planning to build. "Ready to Build?"
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01-20-2015, 08:02 PM
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Join Date: Jun 2009
Location: Mesa, AZ
Posts: 242
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Gil:
I just noticed that today is the 10th anniversary of you joining VAF.
Congratulations!!! Almost 7,000 posts, too.
gary
__________________
gary
RV-6A QB Tip-Up, 1st Flight 3/18/17 
O-360-J2A (modified & F/I), Sensenich FP (cruise)
VP-X Sport, Dynon SkyView, VFR day
(FFZ) Mesa, AZ - N234GB -
www.mykitlog.com/garyc
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01-20-2015, 09:47 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by RViter
Gil:
I just noticed that today is the 10th anniversary of you joining VAF.
Congratulations!!! Almost 7,000 posts, too.
gary
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Thanks, I hadn't noticed.
Big day Thursday, I'm picking up my assembled O-360 from near you at Chandler...
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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01-21-2015, 01:58 PM
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Join Date: Aug 2013
Location: Oslo, Norway
Posts: 40
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Back to corrosion
Is it possible to say something about how hard attack the wing top skin is from the image and what must be done immediately and what must be done before painting in a few years?
Is this a reason to worry and that degrades the value?

__________________
RV enthusiast Helge Dypdalen -"dypen". EAA Chapter 573 Norway -member. Cessna 182S LN-EDB -flying. Van's RV-7 -planning to build. "Ready to Build?"
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01-21-2015, 02:19 PM
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Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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Hard to tell from pictures, but this appears to be very minor. It should polish out easily. If the project is now in a conditioned space and not being exposed to moisture or a high humidity environment, you would not need to treat further. A self etching primer would protect the areas you polish, but again, not needed if your environment is relatively dry and non condensing.
You could do as Gill suggests, but that is a lot of work. Also, if you acid etch, you will need to convert and prime as the raw etched surface left unprotected will be more susceptible to corrosion.
This type of corrosion is minor and relatively common.
__________________
Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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01-21-2015, 04:20 PM
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Join Date: Aug 2013
Location: Oslo, Norway
Posts: 40
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I see QB kit is the blu protection plastic take off when arrived, Standard kit builders having plastic on as long as possible.
__________________
RV enthusiast Helge Dypdalen -"dypen". EAA Chapter 573 Norway -member. Cessna 182S LN-EDB -flying. Van's RV-7 -planning to build. "Ready to Build?"
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