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  #1  
Old 01-20-2015, 01:31 PM
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Default 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.
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  #2  
Old 01-20-2015, 01:52 PM
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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.
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  #3  
Old 01-20-2015, 02:32 PM
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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:
Elimination of corrosion by application of an organic film to metal surface.



CHAPTER 6. CORROSION, INSPECTION & PROTECTION.pdf
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Last edited by dypen : 01-20-2015 at 02:35 PM. Reason: Link ....
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  #4  
Old 01-20-2015, 03:02 PM
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Quote:
Originally Posted by dypen View Post
Looks like it must be polished or sanded away, using chemicals should be unnecessary since there is no painted surfaces.
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.
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  #5  
Old 01-20-2015, 03:18 PM
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Thanks for the quick reply! After polishing / sanded it makes sense to clean and protect for good result
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  #6  
Old 01-20-2015, 08:02 PM
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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
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  #7  
Old 01-20-2015, 09:47 PM
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Quote:
Originally Posted by RViter View Post
Gil:

I just noticed that today is the 10th anniversary of you joining VAF.
Congratulations!!! Almost 7,000 posts, too.

gary
Thanks, I hadn't noticed.

Big day Thursday, I'm picking up my assembled O-360 from near you at Chandler...
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  #8  
Old 01-21-2015, 01:58 PM
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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?

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  #9  
Old 01-21-2015, 02:19 PM
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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.
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  #10  
Old 01-21-2015, 04:20 PM
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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.
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