Connecting a stainless steel plate to a carbon steel bushing to avoid galvanic corrosion

[EngTipsAccount1234]

I have a customer that wants to connect a T304 electropolished stainless steel plate to an embedded carbon steel bushing. This will be near a pool so will regularly be exposed to pool water. I'm wondering how to design the connection to avoid galvanic corrosion.

 

[EdStainless]

Don't connect them.
They would need to be electrically isolated from each other.
Such as by a plastic bushing/spacer.
And even then you are likely to get crevice corrosion.
And 304 will not stand up very well to pool water either.
Why is the bushing CS?
Is there any chance to change that material?
Maybe a high strength SS, or an engineered polymer?

 

[mfgenggear]

Or coat the bushing with copper. Or zinc

 

[TugboatEng]

On another note, any ferrite from the CS part is going to undo any benefits from electro polishing.