Ugh - does it say this on the copper Anti Seize tube? I have smeared this all over aluminum stuff. Never thought about it in relation to the anodic index. That is frustrating. Going to go lread the tube.

 

Galvanic corrosion is a big issue on boats, especially ones in salt water. Most marine riggers I know use Tef-Gel on fasteners and areas where dissimilar metals are in contact. I've used it for years on my sailboat with good results. No affiliation etc.

Tef-Gel

 

Great post. We were allowed only very specific neverseize in the refineries. Nickel antiseize on carbon and alloy steels. Graphite only on gas and steam turbine parts. We used to use something called C-102 that was the only thread lube allowed by GE. Galvanic corrosion is real.

Painful experience - I owned a small diesel pickup that had a major cooling system failure. The engine was all cast iron with the water pump, thermostat housing made of cast zinc. The radiator was brass. The previous owner used antifreeze but not enough. The water pump and thermostat housing all disintegrated as the sacrificial anode in the system. Lesson learned.

 

Here is a paste for hot parts, like header bolts/studs, etc.
100 gr. Tube ceramic paste anti-seize paste mounting paste grease +1400°C (€129.90/1KG) | eBay
White, metal -free, reduces wear, offers reliable separation of hi temperature affected thread connections. Temperature range from - 40 ° C to + 1400 ° C (2500 ° F). Prevents corrosion, does not burn. Resistant to hot or cold water as well as most acids and alkalis.

 

Sorry but applicable for objects immersed in salt water

If there is enough water to cause galvanic corrosion, the mild steel components will have dissolved if unprotected years before.

Stop worrying about this in cars, especially cars that do not live outside in the winter, unless you habitually park in the ocean

IF you attach a stainless steel plate to something with an aluminum bolt, yes it may have an issue.


Header bolts
Attached the stainless headers on my aluminum headed twink with standard neverseeze 39 years ago.

Zero corrosion

 

Sorry but applicable for objects immersed in salt water

Actually Tef-Gel is used mostly on sailboat rigging (masts, booms, running rigging, etc.) where stainless and aluminum, or bronze and steel are in contact. It's not used underwater, there you need to use sacrificial anodes. The salt air is more than enough to cause corrosion in parts that stay mostly high and dry, which arguably have less salt exposure than our cars in just the occasional run in late spring on a salted road!

 

As one of my metallurgical colleagues always said, "Rust never sleeps."

 

Top 5 Anti-Seizure Compounds Used Onboard Ships

Marine Insight - The maritime industry guide.

www.marineinsight.com

 

I place some faith in the anti-sieze filling the gaps and displacing any potential electrolyte from the thread area in the first place.

 

No
I think you missed my point
I will ignore galvanic corrosion because it is simply so rare in an automobile that is usually the result of gross mishandling of the vehicle.
water instead of coolant.
I suggest using neverseeze according to the manufacturers instructions
I have used neverseeze on alloy wheel studs for decades.
There are Elans with copper washers on alloy calipers that are nearly 60 years old.