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Corrosion followup thoughts

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naumuk(at)alltel.net
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Posted: Sun Dec 07, 2008 7:23 am Post subject: Corrosion followup thoughts

All-

     I remember other people also  reporting corrosion on their parts. If Ben were willing to test corrosion  samples from those builders we could verify that calcium was the common root  cause of the corrosion. Of course, it could be sodium for builders in coastal  states. Simply put, salt in any form.

     One corrective action would  be a heavy gauge form fit bag lining the shipping crate but  that creates a problem of its own. If the bag is airtight, you run the risk  of condensation. My gut feeling is that you can ventilate top of the bag,  but how much ventilation is necessary? Also, does the solution have to  contact the metal in a liquid form, or can it be airborne? If it can be  airborne, we're in trouble.

     This could be a case of where  the root cause is relatively easy to identify but not so the  solution.  First things first. Ben, you up to doing a little more  government work?

     

 Bill Naumuk

Townville, Pa.

HDS 601MG/Corvair  95%

   [quote][b]

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jaybannist(at)cs.com
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Posted: Sun Dec 07, 2008 7:55 am Post subject: Corrosion followup thoughts

Just to add some data:

 

 I build from component kits. All the fabricated metal I received from ZAC was free of corrosion.  When I received a shipping crate, I unloaded the parts I needed immediately.  The rest was stored outside, in the crate, covered with Visqueen. I got no corrosion.  With each component kit, I got a lot of scrap aluminum.  About 25% of that had a surface haze on it.  That haze was fairly easily removed with Scotchbrite.

 

 I stored my completed wings outdoors on a rack covered with a tarp for about two years. When I uncovered them to do painting, I found a lot of what looked like water spots.  It was verry spotty corrosion. I could not detect any pitting.  It was not that difficult to remove with Scotchbrite, but it took a long time because there was so much of it.  The worst of it was where the tarp made contact with the metal. The only moisture that the wings were subject to had to be condensation. In Dallas, I don't think there would be any possibiity of salt products contaminating the condensation.

 

 Jay in Dallas 

 

   

 

   

 

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