What To Use To Prevent Galvannic Corrosion On New Quill Stem?

[woodbine]

I'm going to replace the old steel and chrome quill stem on my steel framed MTB with a new aluminum one. What grease or other coating can I put on the stem to stop it reacting with the steel headset tube and seizing in place?

Many thanks for any help and advice.

 

[FrankCrank]

Copper grease is the preferred stuff - failing that any regular grease is better than nowt.

 

[raleighnut]

Copper grease is the preferred stuff - failing that any regular grease is better than nowt.

Vaseline (Petroleum Jelly) is better, it is inert whereas Grease contains Soap in it's formulation

 

[Tom B]

You can get anti galvanic corrosion paste. Not sure if it's much use in this instance. I've never used it just saw it at a local tool & fixings merchants a few days ago.

 

[MichaelW2]

In practice, std lithium white grease with stop the parts corroding.

 

[GuyBoden]

I've had a tub of FSASP Anti Seize Paste by Solent Lubricants for years.

It's an aluminum based anti seize, which has PTFE.

I use it on pedals, BB cups, seatposts, stems etc

It's a white paste and easier to clean/remove than copper based paste.
https://static-content.cromwell.co.uk/pdfs/s/Medusa_Attachments/SOL/740/SOL-740-6720B_TDS.pdf

 

[Blue Hills]

I have some shimano anti-seize - seems good stuff for this.
But if not available I'd just use simple heavy grease.
Have never yet had a quill stick despite some mistreatment.
It's a good basic system.

 

[rogerzilla]

Calcium-based grease. More water-resistant than lithium-based.

 

[Drago]

Moly ant seize 'grease' is the bestestest, but any old grease will likely do so long as its released, cleaned, inspected and re lubed every few years.

Once assembled a thin smear of silicone sealant arpund the top nut of the headset and the stem will feduce water ingress (works on seat posts too for bikes that are used all weathers.)

 

[woodbine]

Thanks to all for your replies. Will see if I have any of your suggestions knocking around in the garage, if not will source the right product.

 

[Juan Kog]

I use Alumslip anti seize when assembly involves aluminium. But as others have said any grease is better than none.

 

[GuyBoden]

The trouble with anti-sieze on seatposts, is that the seatpost can sometimes slip, but slippage has never occurred on my quill stems, but I wouldn't over do it with the grease.

 

[fossyant]

Grease works fine. I do use copper slip on some parts.

 

[silva]

I'm going to replace the old steel and chrome quill stem on my steel framed MTB with a new aluminum one. What grease or other coating can I put on the stem to stop it reacting with the steel headset tube and seizing in place?

Many thanks for any help and advice.

Why would aluminium suffer galvanic corrosion with a non stainless steel grade frame?
It's only when metals differ alot in nobility (so higher voltage).
And how could it lead to seizing in place?
It's the opposite, the aluminium gets dissolved - things come lose. Byebye screwthread etc. You can see white powder in place.

An example of galvanic corrosion is between an inner tube valve and an aluminium rim.
You see a little bit white powder around the valve basis, that means the hole in the rim got abit wider.
But it's not worse / acceptable, because once the hole got wider, contact is less or nothing, and without contact, no electrical current, and no corrosion. Also, the amount aluminium is way bigger than the amount stainless, so the current has more "conducting material " to pass through / no concentration. The opposite, an aluminium screw in a stainless plate, wouldn't last long.

 

[raleighnut]

Why would aluminium suffer galvanic corrosion with a non stainless steel grade frame?
It's only when metals differ alot in nobility (so higher voltage).
And how could it lead to seizing in place?
It's the opposite, the aluminium gets dissolved - things come lose. Byebye screwthread etc. You can see white powder in place.

An example of galvanic corrosion is between an inner tube valve and an aluminium rim.
You see a little bit white powder around the valve basis, that means the hole in the rim got abit wider.
But it's not worse / acceptable, because once the hole got wider, contact is less or nothing, and without contact, no electrical current, and no corrosion. Also, the amount aluminium is way bigger than the amount stainless, so the current has more "conducting material " to pass through / no concentration. The opposite, an aluminium screw in a stainless plate, wouldn't last long.

Search 'Stuck seatpost, 'Stuck stem' on here, it happens a lot