Today's Message Index:
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1. 06:53 AM - Fw: posting on matronics about corrosion (Bill Naumuk)
2. 05:47 PM - Re: Re: T-6 Corrosion Resistance (Ken Lilja)
Message 1
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| Subject: | Fw: posting on matronics about corrosion |
All-
Self-explanitory.
Bill
----- Original Message -----
From: Bill Naumuk
Sent: Saturday, November 08, 2008 9:50 AM
Subject: Re: posting on matronics about corrosion
Ben-
I don't have any of the paper that covered the sheet, but I do have
some of the paper which covered my welded fitments. I don't know for
sure if they're the same, but I can't see Zenith stocking different
types of kraft paper to wrap different parts.
A sample of the sheet and of the paper are going out to you today.
I've separated them to avoid possible cross contamination.
In my estimation, you're an example of what every lister should
strive to be. Someone committed to finding a logical engineering
solution to a problem rather than one who endlessly speculates. Thanks
for your efforts for the Z builder community.
Bill
----- Original Message -----
From: Bill Naumuk
To: Benjamin Church
Sent: Friday, November 07, 2008 6:47 PM
Subject: Re: posting on matronics about corrosion
No, I don't. Sorry
Bill
----- Original Message -----
From: Benjamin Church
To: Bill Naumuk
Sent: Thursday, November 06, 2008 10:24 PM
Subject: Re: posting on matronics about corrosion
Bill,
If you have some of the original paper - send that too. I have some
myself which is probably the same thing but the best bet would be to
have the same paper that was on the corroded skins...
- Ben
-------------------------------------------------------------------------
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From: Bill Naumuk <naumuk@alltel.net>
To: Benjamin Church <bcchurch@yahoo.com>
Cc: zenith list <zenith-list@matronics.com>
Sent: Thursday, November 6, 2008 5:20:28 PM
Subject: Re: posting on matronics about corrosion
Ben-
Will do.The interesting thing is, the finished wings are still
in the same basement with no corrosion- they're visible in the pictures
I posted. The only problem I've ever had was with the stuff that came
with the kit. Can the paper make that much of a difference?
Bill
----- Original Message -----
From: Benjamin Church
To: naumuk@alltel.net
Sent: Wednesday, November 05, 2008 9:22 PM
Subject: posting on matronics about corrosion
Howdy Bill,
Saw your posting on the Zenith list
http://forums.matronics.com/viewtopic.php?t=50611
I was wondering if you might have a piece of that corroded
aluminum left over. If you do, would you be willing to cut a piece of
the worst-looking stuff and send it to me? Something the size of a
business card or so would be plenty. If you send me some, I'll take it
to work and do some analysis that might tell you what caused the
corrosion. I'd be able to tell if it was biological, humidity, or
caused by something else. I'm a materials engineer and so I have access
to all kinds of analysis equipment at work. No guarantee I'll find a
solid answer, but my time and effort is free so all you have to loose is
a piece of corroded aluminum!
I'm storing some parts in my basement, some in the living room,
and some in the garage. I've been curious about corrosion during
storage and so you're problem could provide some good evidence.
Let me know.
Regards,
Ben Church
CH801 - working on the wings
507 Melvin Ave
Racine, WI 53402
Message 2
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| Subject: | Re: T-6 Corrosion Resistance |
Take a look at the metal with a magnifying glass and a bright
flashlight. If there are no pits then it probably is just staining, not
corrosion. Aluminum corrosion products are generally a white powder
that is not too hard to remove. Try cleaning with some Alumiprep 33.
This is what is used to prep for applying Alodine, painting or welding.
The Alumiprep should foam up and bleach the surface to almost white.
Flush with plenty of cold water. Remember to dilute with water as
directed. You don't need to use Alodine afterwards unless you want to.
A natural layer of aluminum oxide will form quickly and seal the surface
back up. Not to open old threads but.... 3M maroon scotchbrite is
aluminum oxide based and is OK on aluminum. Don't use silicon carbide
sandpaper on AL. It can lead to corrosion (per AC43.13 2A) 3M offers
an aluminum oxide wet or dry paper (Imperial) that is no more expensive,
just had to find. I you want to see some impressive corrosion I could
post a image of a Cessna wing mounting block with intergranular
corrosion. Flat out 6061 is much more corrosion resistant than 2024.
It is all we can do to prevent 2024 from corroding. Most single engine
Cessnas prior to the 90's were not zinc chromated unless equipped to
have floats. We have it easy.
Ken Lilja
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