"Unacceptable material pairs include a rubber seal with a carbon black loading so high (for UV resistance) that it is conductive and causes galvanic attack of a stainless screw or pin. Gaskets incorporating graphite have caused similar problems for stainless steel flanges and must not be used for seawater regardless of the stainless steel alloy. "
www.assda.asn.au/publications/technical-faqs/galva...n
Chart immediately below, at the bottom of the page, shows a bigger difference between graphite and aluminium than between graphite and low-carbon steel.
Then I suppose the UK climate will add salty water, which will form hygroscopic deposits in the wheel/tyre interface.
Here's a doode with his hat on backwards, to add more cool cred to this explanation
. (Havnt actually watched this but I assume its cool and credible, since hes got his hat on backwards)
www.youtube.com/watch?v=yRpMZaU8zKw
I suppose you could attempt to address the problem with a sealant, though you'd want to avoid anything that might attack the rubber. Maybe a silicone spray or grease.
Alternatively, or in addition, you could attempt to isolate the rim with something tough that would stand up to the stresses of tyre mounting, maybe an epoxy, though I dont personally like epoxies.
Perhaps an alkyd resin like Penetrol, which I havn[t used, but it sounds useful
Failing that I would probably try my automotive panacea, vegetable oil (boiled linseed in this case) and rubbing with crumpled aluminium foil.
I'd let it set for a day or two to minimise the possibility of rubber attack, then I;d go over it with a thin smear of silicone grease, (which shouldn't be unobtainium in the UK), before fitting the tyre.
Edited by edlithgow on 06/07/2024 at 01:48
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