Question for you Fly-Boys :D

[RichardH]

Many years ago, when I was working in the aircraft industry there was a fluid called Alacrom???? Which was, I believe a Chromate primer for Aluminium articles which needed to be "fettled" to fit. At the same time I used to use a yellow paste when fitting steel bolts thro Alloy panels. I believe that this was to reduce/stop electrolytic corrosion.
Having spent 9 hours!!! yesterday removing a siezed bolt from within an Aluminium Alloy casting (Water pump/Timing cover on a Landrover) because of corrosion, sufficient to shear the bolt twice!! (once with an external stud remover), thought I would look into trying to obtain something to ....
a) Seal against Oxidisation of the machined Alloy housing.
b) Protect against the new bolts corroding into the housing again.

I know that some peeps swear by using loads of Coppaslip or similar but do any of you know where I can get small quantities of Alacrom (or similar) and this yellow anti sieze/corrosion inhibitor paste from?
Preferable (as usual) without spending a mortgage on getting it .

 

[JohnMcL]

Richard,
Try Trimite in Birmingham.
Pretreatments
or see if you can scrounge a small quantity from your local anodiser.
John McL.

 

[Scott Calabro]

Richard,

Google "Mastinox."

 

[RichardH]

Brill - thanks for quick replies

Google came up with this too
There also seems to be some doubt over its effectiveness/legality - here???

 

[RichardH]

I seem to have opened up a can of worms here....
having had a look at the Molyslip site (manufacturers of Copaslip) I notice that they manufacture a product called "Aluslip" which seems to be an aluminium based version of Copaslip; but I could find no reference as to when or why you would use one or the other - except for "to be used when copper based products cannot be tolerated"

I also notice that they manufacture a couple (well lots really) of products that would be useful in a hostile (automotive) environment - such as "Rusolvent" - penetrates clearances and cuts through rust and corrosion to free and release corroded parts. Also Molyslip EHT - for those hard to get apart exhaust systems, as even if carbonisation occurs the residue will remain friable.

Have any of you guys tried either of these products?<?XML:NAMESPACE PREFIX = ACTINIC /><ACTINICRICES PROD_REF="126" RETAIL_PRICE_PROMPT="Price:"></ACTINICRICES>

 

[Doug S.]

Having spent 9 hours!!! yesterday removing a siezed bolt from within an Aluminium Alloy casting (Water pump/Timing cover on a Landrover) because of corrosion, sufficient to shear the bolt twice!! (once with an external stud remover), thought I would look into trying to obtain something to ....
a) Seal against Oxidisation of the machined Alloy housing.
b) Protect against the new bolts corroding into the housing again.

Maybe a low-tech solution....how about some anti-sieze lubricant? I always use some when I change the spark plugs in my aluminum head Honda and Mazda engines....would that work in your application?

Doug

 

[David Morton]

How would a pilot know anything about any of this? It's either serviceable or it's not. If it's actually serviceable it can be made unserviceable quite easily. As for unscrewing parts, thats for the techies. Once they sign the tech log that something is serviceable and shut the door or canopy from the outside, then playtime commences. But - unscrewing things?
"Not my aisle" the cabin crew (plate layers) used to quip.

 

[RichardH]

Sorry David - I am suitable chastised .
I actually meant peeps that work in the aircraft industry - not just the glory-boys .

 

[RichardH]

Maybe a low-tech solution....how about some anti-sieze lubricant? I always use some when I change the spark plugs in my aluminum head Honda and Mazda engines....would that work in your application?

Doug

Exactly - but anti-sieze lubricant is not much good if the aluminium is not protected. The Mastinox is an anti-sieze compound. You will notice I mentioned "Copaslip"

 

[Lee 4TGT]

hello richard. take a look at this product. it's used in the marine industry. Duralac DTD 369B prevents Bi Metallic Corrosion DTD369B
regards lee

 

[Scott Calabro]

Richard,

If the mastnox is too expensive...I don't blame you!

E mail me @ [email protected] with a shipping address and I'll mail you an expired tube free.

Not technically good for aircraft anymore but the best you will get for what you want it to do.

Regards,
S

 

[RichardH]

Thanks Scott. A very kind offer, but I am still at the evaluating stage. Is that sorta stuff better than using Copaslip or Aluslip on all mating parts?

 

[Scott Calabro]

If you want to mechanically join two dissimilar metals like steel and aluminum, and prevent galvanic corrosion for all eternity, then Mastinox is what you want.

However, for what you want to do you will be fine with any good anti-seize compound.

Cheers,
S