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Braybuddy
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Are Newly Built Aircraft Covered In Film?

Thu Sep 08, 2005 2:11 am


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Photo © Gustavo Bertrán - Iberian Spotters



Why are newly built aircraft always a yellow/green colour? Is there a protective film coating the aluminium surface?
 
FredT
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RE: Are Newly Built Aircraft Covered In Film?

Thu Sep 08, 2005 3:49 am

It's just the primer coat. Good for preventing corrosion.
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Matt72033
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RE: Are Newly Built Aircraft Covered In Film?

Thu Sep 08, 2005 4:12 am

is it Zinc Chromate?
 
SlamClick
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RE: Are Newly Built Aircraft Covered In Film?

Thu Sep 08, 2005 4:15 am

Actually I believe there are two possibilities.

First is zinc chromate which is used on most aircraft aluminum, inside where it doesn't show, mostly. It is green or yellow-green. In the photo below you can see some of it here in this wheel well:

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Photo © John Miller



Boeing also uses a spray on whitetails they are flying for test or other purposes. It looks a lot like zinc chromate and may include that compound but I belive it is more easily removed. When they are ready to deliver the plane it gets painted in customer's livery.

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But I would like to hear from a Boeing employee about this.
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Braybuddy
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RE: Are Newly Built Aircraft Covered In Film?

Thu Sep 08, 2005 4:20 am

Thanks guys. Makes sense.
 
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HAWK21M
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RE: Are Newly Built Aircraft Covered In Film?

Thu Sep 08, 2005 3:43 pm

The New Zinc Chromate Primer is Green & the Older one is Yellowish Green.
Apart from Corrosion Protection It also serves as a good bonding surface for Paint.
regds
MEL
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Tod
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RE: Are Newly Built Aircraft Covered In Film?

Fri Sep 09, 2005 12:05 am

Alodine?
IIRC - The skin sections used to arrived from Northrup that way.

Tod
 
EMBQA
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RE: Are Newly Built Aircraft Covered In Film?

Fri Sep 09, 2005 11:01 am

Actually....

Airbus uses a process in manufacturing called 'Bonded Primer'. This is a chemical treatment that is applied to the sheet stock aluminum before it is made into the skin panels and gives it that 'green look'. This is because European metal works company's do not use 'Alclad', which is a corrosion inhibitor. 'Bonded Primer' must not be removed or disturbed at anytime and is why you never see, with the exception of American's A300, a bare metal Airbus. The Bonded Primer is more clearly shown in this picture
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Boeing uses 'Alclad' sheet stock, which can remain bare metal if the airline so chooses. There is a thin protective treatment applied to Alclad to prevent minor scratching and light corrosion before the painting or polishing process. This treatment is what gives the Boeing's that funky blue color when being built. It is normally removed with a special wash.

[Edited 2005-09-09 04:07:00]
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SlamClick
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RE: Are Newly Built Aircraft Covered In Film?

Fri Sep 09, 2005 11:16 am

I seem to remember when American bought AirCal, they had to paint the BAe-146 aircraft gray when they put them in AA livery. It was supposedly because British Aerospace used aluminum that could not be polished out for some reason. I heard the little four-holer called the "pewter pumpkin" when the paint was stripped.

The Boeing green I've seen on some flight test aircraft is not this pale coating but an actual darker green. Anyone seen what I'm talking about?
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Tod
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RE: Are Newly Built Aircraft Covered In Film?

Fri Sep 09, 2005 11:05 pm

Quoting SlamClick (Reply 8):
The Boeing green I've seen on some flight test aircraft is not this pale coating but an actual darker green. Anyone seen what I'm talking about?

Like the stuff in your reply 3?

That is what I was talking about. If I get time today, I'll try to take a look at a Boeing skin panel drawing and see if it's specified there.

Tod
 
SlamClick
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RE: Are Newly Built Aircraft Covered In Film?

Fri Sep 09, 2005 11:40 pm

Quoting Tod (Reply 9):
Like the stuff in your reply 3?

No, as I recall darker even than Aer Lingus colors, but you could still see the metal and rivets etc. through it. Perhaps they don't use it anymore. Last time I saw it was on 767 fuselage number one which must have been more than twenty years ago.
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