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jaybannist(at)cs.com
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 Posted: Tue Nov 04, 2008 4:38 pm Post subject: Polish, Paint OR not |
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I understand that 6061-T6 is very corrosion resistant. Therefore, I only painted the fiberglass parts, invasion stripes and a little other cosmetic painting. I actually like the look of the "raw", unpolished aluminum. Judge for yourself.
Jay in Dallas
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daveaustin2(at)primus.ca
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| Posted: Tue Nov 04, 2008 5:58 pm Post subject: Polish, Paint OR not |
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I didn't paint for the first 4 years and only polished twice. After the four years and four Canadian winters small white pockets began to appear on the 6061, particularly round the rivets.
I had it painted.
Dave Austin 601HDS - 912
[quote][b]
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chapred(at)free.fr
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| Posted: Wed Nov 05, 2008 3:02 am Post subject: Polish, Paint OR not |
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Hello every…budy’s !
Let me introduce myself :
My name is François CHAPPERON, I’m French, you know ? the ones who eat frogs !
I’m 54 years old and ultra light flying since 1995 on various machines…
November 2007, I’ received directly from the Canadian Zenith factory, my 100% kit of 601 xl .
Motor is a Rotax 912 s .
I have a parachute BRS .
First flight was ran on July the 4th !
Meanwhile , I went through the various difficulties of building with very few plans and information !
I was reading Zenith list regularly, picking informations and not enough sure of myself to get in contact …
Yes you can be shy at 54 ! Especially when the language is different .
I have had some direct contacts and advice with our friend “cookinwithgaz” .
Today I’m pleased to get into the community , …and to give my point of view about the topic.
I went through polishing nearly all of my 601 except parts to be painted .( see pictures on: http://picasaweb.google.fr/chapred
It took me about hundred hours with Nuvite stuff and process. (ordered directly by internet half price with France!!!)
The result is splendid, and maintenance is not so hard ! The water here is overcharged with calcareous, impossible to wash traditionally.
So I use a wet (not dumpy)microfiber glove (water +dish soap) and I dry immediately with others microfibers gloves(generally two)
Result is nice and delay the day I will have to re-polish !
Aluminum oxide is a natural barer to more oxidation but I ‘m still not sure that a non painted aircraft is as resistant to oxidation than a painted one…
In the mean time, there is a lot of planes , painted, which present oxidation attacks …
So what to think ?
I read in one of the skipped posts that the aluminium used by Zenith should be more resistant than the one used by Cessna or others…
Is that “probated” ?
Sincerely,
François
[quote][b]
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psm(at)att.net
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| Posted: Wed Nov 05, 2008 3:46 am Post subject: Polish, Paint OR not |
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Hi Francois,
RVs and (I think) Cessnas use an aluminum alloy
called 2024 for skin and other purposes. this is
a very stiff and strong alloy that contains
copper. It is the copper in this metal that
corrodes easily because it is very chemically active.
Our planes are made primarily from 6061. This is
an aluminum alloy that contains no copper. It is
commonly used for household products like screen
doors and lawn furniture. It is highly resistant
to corrosion in normal environments. It does
tend to corrode when exposed to sea salt as you
might find in the air near oceans.
I believe paint will help prevent corrosion on
either alloy. It can be considered a necessity on 2024 and optional on 6061.
2024 is so prone to corrosion that it is usually
shipped with a thin coating of pure aluminum on
the surface to preserve it. This product is
called "Alclad". The coating does work so long
as it is not scratched. It is so thin that even
a small scratch will expose the copper alloy in
the main piece of metal. This means the alclad
feature is not satisfactory for long term use to prevent corrosion.
After all that, I am taking a conservative
approach to corrosion prevention on my XL. I did
not apply any paint on internal joints as some
people do. I did paint exposed interior parts
such as the cabin interior and I intend to paint the entire exterior.
Paul
XL getting close
At 03:01 AM 11/5/2008, François CHAPPERON wrote:
| Quote: | I read in one of the skipped posts that the
aluminium used by Zenith should be more
resistant than the one used by Cessna or others…
Is that “probated” ?
Sincerely,
François
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Wed Nov 05, 2008 6:33 am Post subject: Polish, Paint OR not |
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The Zenith aircraft use 6061 aluminum, which is a corrosion resistant alloy. It is not necessary to apply protective coating to the inside surfaces of the airplane in most cases.
Most aircraft are made of 2024 aluminum which is not nearly as corrosion resistant as 6061. 2024 usually has a coating of pure aluminum on one side to protect the outside surfaces of the airplane from corrosion. The inside surfaces of an airplane made of 2024 should be painted with a corrosion resistant material or there is a higher risk of hidden corrosion causing damage to the airplane.
6061 is more corrosion resistant and less expensive than 2024 but 2024 is significantly stronger than 6061. An airplane made of 6061 has to be built a bit heavier than one made of 2024 to get the same strength. This is an acceptable trade off on smaller airplanes. On large airplanes, the extra weight becomes an issue so 2024 is preferred.
On Nov 5, 2008, at 6:01 AM, François CHAPPERON wrote:
| Quote: | Hello every…budy’s !
I read in one of the skipped posts that the aluminium used by Zenith should be more resistant than the one used by Cessna or others…
Is that “probated” ?
|
--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
[quote][b]
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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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