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carbon fibre
- vti2003
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Be careful skinning metals directly with carbon. If the carbon contacts the steel it causes pretty severe galvanic corrosion. Either prime the metal with a sealed epoxy primer and then skin or best or all use a blocker layer of fibreglass between the metal and carbon
Carbon corroding metals has been a massive problem in aerospace for years.
Carbon corroding metals has been a massive problem in aerospace for years.
- littlefeller
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- vti2003
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It is the carbon, fibreglass doesn't do it.
I may not be 100% right as I am digging in the depths of my memory here
I think it is because for this type of corrosion to occur you need an anode and a cathode, Fibreglass is, as the name suggests, made from glass which is an insulator and as such cannot act as a cathode. Carbon however is a very good conductor and can therefore act as a cathode, the metal itself will act as the anode.
So carbon and metal = anode and cathode - corrosion, whereas glassfibre and metal = anode only = no corrosion.
The same process as dissimilar metal corrosion where two different type of metal in contact with each other will corrode.
I think.......................
As said before just use a layer of fibreglass between the metal and carbon. That's what boeing and airbus do.....
I may not be 100% right as I am digging in the depths of my memory here
I think it is because for this type of corrosion to occur you need an anode and a cathode, Fibreglass is, as the name suggests, made from glass which is an insulator and as such cannot act as a cathode. Carbon however is a very good conductor and can therefore act as a cathode, the metal itself will act as the anode.
So carbon and metal = anode and cathode - corrosion, whereas glassfibre and metal = anode only = no corrosion.
The same process as dissimilar metal corrosion where two different type of metal in contact with each other will corrode.
I think.......................
As said before just use a layer of fibreglass between the metal and carbon. That's what boeing and airbus do.....
- paul bristol uk
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That bit is true from my days or restoring classic big Healy's with ally scuttles and steel wings. As for the rest of your post I will take your word for it!vti2003 wrote:
The same process as dissimilar metal corrosion where two different type of metal in contact with each other will corrode.
I think.......................
I have kleptomania,
But when it gets bad,
I take something for it.
But when it gets bad,
I take something for it.
- vti2003
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If you look at the chart below it explains. The bigger the gap between the materials the more likely corrosion is. Mild steel is quite far on the right as is aluminium while graphite (Carbon) is on the far left. Big gap = big rust The new Boeing 787 has had to use loads of titanium for fittings instead of aluminium as the main fuselage is made entirely from carbon fibre. The chart shows why. Titanium is very close to graphite and will not corrode like ali, as well as expanding at a similar rate to carbon when heated.
So when you are delaing with carbon treat it as a metal for corrosion purposes.
So when you are delaing with carbon treat it as a metal for corrosion purposes.
- littlefeller
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- mercutio
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yeah to prevent the moisture getting in it would have to be bonded could you use an epoxy primer
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- littlefeller
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- littlefeller
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