aluminium corrosion treatment

Hi folks, I'm have trouble doing a search on my iphone, so thought i'd just ask.

is the a corrosion treatment for aluminium that can be painted over once cured? (one that works)

no.

but if yu have good Al, yu can alocrom or anodise it. Else use acid etch primer.

there is some surface corrosion and pitting on body panels, whats the best thing to clean off the corrosion prior to etch priming?

wet & dry

daddy2coull said:

there is some surface corrosion and pitting on body panels, whats the best thing to clean off the corrosion prior to etch priming?

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phosphoric acid 20w/w - or tradename De-oxidine 200.

not cheap tho & feckin dangerous. Acid etch after.

cheers guys, stuck at work and trying to clean up my doors while its quiet

Usually ali pitting and blistering is where it's in close contact with steel......on a Landy that means the problem is on the inside! Only way to completely prevent it is to isolate from steel and then prevent water getting anywhere near.....

Yeah right!

bitumen spray! look in any aero site - its a common problem..

The Mad Hat Man said:

bitumen spray! look in any aero site - its a common problem..

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Fair enough.......best keep it on the mud then

The Mad Hat Man said:

bitumen spray! look in any aero site - its a common problem..

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Used to use canvas and white lead

They now have switched to Bitumen rolls and silicon

Thor1950 said:

Used to use canvas and white lead

They now have switched to Bitumen rolls and silicon

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We used to use a yellow putty type stuff on the copters but fooked if I can remember whats twas called

blue beasty said:

We used to use a yellow putty type stuff on the copters but fooked if I can remember whats twas called

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For defender door frames where the aluminum skin touches a good primeron the steel and then when that is dry a good grade silicon ( not bath tube crap) but a good quality construction grade

its not so much where the steel meets the ally, i looks for like its where the outer skin has been scratched or paint is very thin. but yes, the frames are f@@k3d too lol, but i've just ordered the repair sections from YRM for that. I'll use the above tips to prevent further corrosion on the rebuild

Thor1950 said:

For defender door frames where the aluminum skin touches a good primeron the steel and then when that is dry a good grade silicon ( not bath tube crap) but a good quality construction grade

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NNNNOOOOOO! the last thing yu need is acetic acid on aluminium!

We used silicone to seal CV-580 windscreens back in the early 90's and had to put a stop to it because of that reason.

read this... http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/a7ffc0f8b6216a43862569b5005081ed/$FILE/AC%2043-4a%20.pdf

Sikaflex and Vulkem are better.

The Mad Hat Man said:

NNNNOOOOOO! the last thing yu need is acetic acid on aluminium!

We used silicone to seal CV-580 windscreens back in the early 90's and had to put a stop to it because of that reason.

read this... http://www.airweb.faa.gov/Regulator...8b6216a43862569b5005081ed/$FILE/AC 43-4a .pdf

Sikaflex and Vulkem are better.

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what about a polyurathane seam sealer/bonding agent?

ah, just saw your edit, i was actually thinking of sikaflex

The Mad Hat Man said:

NNNNOOOOOO! the last thing yu need is acetic acid on aluminium!

We used silicone to seal CV-580 windscreens back in the early 90's and had to put a stop to it because of that reason.

read this... http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/a7ffc0f8b6216a43862569b5005081ed/$FILE/AC%2043-4a%20.pdf

Sikaflex and Vulkem are better.

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looked at the pics not going to read it all, so the chemicals in solicon then cause issues

Thor1950 said:

looked at the pics not going to read it all, so the chemicals in solicon then cause issues

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the only one i know which is ok is made by Dow Corning for aircraft use.

The Mad Hat Man said:

the only one i know which is ok is made by Dow Corning for aircraft use.

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and that is $$$$$$$$$$$$$$$$$$$ But it is only a defender and they really don't fly maybe tar in a tube would be good then, a thin layer , or a spray rubber product

Thor1950 said:

and that is $$$$$$$$$$$$$$$$$$$ But it is only a defender and they really don't fly maybe tar in a tube would be good then, a thin layer , or a spray rubber product

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Of course it is. The aircraft industry have spent billions on anticorrosion products and protection. As I said before, use sikaflex to act as an electrolytic barrier, but once it's corroded, it's nasty stuff to fix it and then prep it for use.