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Corrosion on Fuselage Concern!

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Big Wally
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Corrosion on Fuselage Concern!

Postby Big Wally » Sat May 20, 2017 8:16 pm

Have some corrosion on the Fuselage around the edges of the Screw holes. Will this continue or can it be stopped?

BW

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Re: Corrosion on Fuselage Concern!

Postby Peter_Frank » Sat May 20, 2017 8:46 pm

Big Wally wrote:
Sat May 20, 2017 8:16 pm
Have some corrosion on the Fuselage around the edges of the Screw holes. Will this continue or can it be stopped?

BW

If it is carbon/fiberglass then it is a slight corrostion from the screws, and it does not matter and wont get worse.

You could try to find a higher grade of stainless screws, so it wont corrode, but usually a slight corrosion does not matter, and for sure it wont destroy the carbon/glass :D

8) PF

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Re: Corrosion on Fuselage Concern!

Postby Big Wally » Sat May 20, 2017 9:14 pm

It's Aluminum. Some of the coating has come off on the Fuse around the edges where the Screw sits flush its corroded.

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Re: Corrosion on Fuselage Concern!

Postby 3InletsWindsports » Sat May 20, 2017 10:32 pm

Just watch it and note if it grows.
If it's just anodised take note of the corrosion is creeping under the anodised layer.
But it will keep going until you can clean all the corrosion and recoat it.

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Re: Corrosion on Fuselage Concern!

Postby plummet » Sun May 21, 2017 1:08 am

Peter_Frank wrote:
Sat May 20, 2017 8:46 pm
Big Wally wrote:
Sat May 20, 2017 8:16 pm
Have some corrosion on the Fuselage around the edges of the Screw holes. Will this continue or can it be stopped?

BW

If it is carbon/fiberglass then it is a slight corrostion from the screws, and it does not matter and wont get worse.

You could try to find a higher grade of stainless screws, so it wont corrode, but usually a slight corrosion does not matter, and for sure it wont destroy the carbon/glass :D

8) PF
That's the worse advice yourve given Peter!..

Corrosion will can only ever get worse unless you actively try to stop/reduce it.

PS Take a picture so we can see.

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Re: Corrosion on Fuselage Concern!

Postby Big Wally » Sun May 21, 2017 4:35 am

Ok
Last edited by Big Wally on Sun May 21, 2017 12:22 pm, edited 2 times in total.

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Re: Corrosion on Fuselage Concern!

Postby OzBungy » Sun May 21, 2017 8:54 am

It looks stuffed. My aluminium foil was much better than that and I got rid of it as soon as possible. I've had my carbon foil for over a year and it is a joy to use and own.

Get yourself a carbon setup and stop stuffing around. Aluminium foils are a really crap marketing joke. They're heavy and expensive for what you get and you're stuck with a maintenance workload for no real benefit.

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Re: Corrosion on Fuselage Concern!

Postby revhed » Sun May 21, 2017 9:23 am

OzBungy wrote:
Sun May 21, 2017 8:54 am
It looks stuffed. My aluminium foil was much better than that and I got rid of it as soon as possible. I've had my carbon foil for over a year and it is a joy to use and own.

Get yourself a carbon setup and stop stuffing around. Aluminium foils are a really crap marketing joke. They're heavy and expensive for what you get and you're stuck with a maintenance workload for no real benefit.
ENOUGH SAID!
Except MAYBE for a alu ONLY STRUT that is well made with A4 screws and TUFGEL used correctly!
RH

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Re: Corrosion on Fuselage Concern!

Postby Peter_Frank » Sun May 21, 2017 10:17 am

plummet wrote:
Sun May 21, 2017 1:08 am
Peter_Frank wrote:
Sat May 20, 2017 8:46 pm
Big Wally wrote:
Sat May 20, 2017 8:16 pm
Have some corrosion on the Fuselage around the edges of the Screw holes. Will this continue or can it be stopped?

BW

If it is carbon/fiberglass then it is a slight corrostion from the screws, and it does not matter and wont get worse.

You could try to find a higher grade of stainless screws, so it wont corrode, but usually a slight corrosion does not matter, and for sure it wont destroy the carbon/glass :D

8) PF

That's the worse advice yourve given Peter!..

Corrosion will can only ever get worse unless you actively try to stop/reduce it.

PS Take a picture so we can see.

Why ? I am serious.

If you got carbon/epoxy and stainless steel, the galvanic corrosion hardly exists.
There are many in depth studies of this, mostly in aviation where the materials are used more often than in vessels but still with salt water (simulated seawater is used in most tests, as it is the "worst").

So the corrosion you got is on the screws usually, smearing a bit on the countersunk holes maybe.

This slight corrosion will not continue into the epoxy/carbon, thats why I would not worry about that - only change my screws if they are too low grade stainless steel.

He replied it was aluminium, so a totally different case of course, where it is a big problem indeed :wink:

8) PF

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Re: Corrosion on Fuselage Concern!

Postby TomW » Sun May 21, 2017 11:05 am

BW,
Have disk hernia, so nothing better to do...
It looks like your aluminum fuse have had the coating worn off through abrasion from screw heads. This has allowed salt water to corrode it.

I would clean it up, wash it with alcohol, carefully sand off the corrosion. Give the area a light sanding and try putting on a coating. Probably a 2 component polyurethane base coat for aluminum boats would work best using a brush. Ask at your local boat shop or do some research.

Then you'll have to maintain that coating occasionally.


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