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Corrosion Protection

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txpilot

Joined: 26 Feb 2007
Posts: 87
Location: Houston, TX

Posted: Fri Jun 13, 2008 6:24 pm Post subject: Corrosion Protection

I have used the Cortec as supplied from ZAC for my corrosion protection.  After buying the 'homebuilt help' video, I decided to take their advice and only apply Cortec where two pieces were riveted together (presumably where moisture could become trapped).  I guess this is for a weight savings standpoint.



Now after completing my wings and most of my fuselage, I'm seeing a lot of untreated areas corroding away in front of my eyes!  I look in the flange holes in the wing ribs and see evidence of corrosion where there's bare metal.



The exterior will obviously be protected by paint, but I'm wondering what could I do for the interior portions (short of disassembling my wings).  Any suggestions?



Thanks,



Dan Ginty

N787DG

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John Bolding

Joined: 23 May 2006
Posts: 281

Posted: Fri Jun 13, 2008 6:49 pm Post subject: Corrosion Protection

ACF50 or Corrosion X, very useful here on the Gulf Coast.  You WILL have to 

get very serious about preping the outside for paint as it crawls up around 

the rivets and starts to spread out on the top surface after being sprayed 

on the inside. A LITTLE goes a long way. BUT don't prep until you are within 

hours of painting as it starts spreading again after you clean it off.

LO&SLO   John Bolding

 	  Quote: 	
		   The exterior will obviously be protected by paint, but I'm wondering what 

 could I do for the interior portions (short of disassembling my wings). 

 Any suggestions?



 Thanks,



 Dan Ginty

 N787DG

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n85ae

Joined: 14 Mar 2007
Posts: 403

Posted: Mon Jun 16, 2008 6:52 am Post subject: Re: Corrosion Protection

Be carefull about using ACF-50 or Corrosion-X over Cortec, or else you might see your Cortec go bye-bye. Cortec needs to be topcoated to be

resistant to just about anything. What you might try doing it thinning some

cortec with alchohol to the consistency of 2% milk, and spraying it 

liberally over everything  inside.  I have two lawn mowers that I leave 

out under some bushes as I have no garage space, and the old toro

has half the paint gone across it's deck (aluminum) and it was oxidizing

like crazy, so I took a can of thinned cortec and slopped it all over it with 

a paint brush a year ago and it seems to have stopped corroding. I

also hit my daughters tricycle with it as it was rusting, and the rust 

stopped as well.



Cortec is definetly not fuel resistant either, I dip tested some cured

cortec in 100LL and it dissolves it before too long as well. 



I have a lot of cortec left over from building so I started using it on

everything that is hinting at corroding around the House, and vehicles

and it works pretty good at  just simply stopping corrosion even without

any surface prep.



Another alternative which is better than ACF-5, and Corrosion X which

are corrosion preventives meeting MIL-81309 (which are a light film

for avionics connectors, and light hardware), is to use one of the more

durable products like CRC "Corrosion Shell". This is like a product we 

used in the Navy on Grumman E-2C's for protecting exposed hardware

we called it Grade 4, but I think it is the same thing. It dries to a brown

waxy film, much better protection than the lighter products, and doesn't

run all over like ACF-50 and Corrosion X will. 



 http://www.aircraftspruce.com/pdf/2008Individual/Cat08365.pdf



Regards,

Jeff

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txpilot

Joined: 26 Feb 2007
Posts: 87
Location: Houston, TX

Posted: Sat Jun 21, 2008 6:57 am Post subject: Re: Corrosion Protection

Thanks for the replies.  I'm thinking ACF50 will be the way to go.



Dan

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