Earth clamp material for copper pipe
Are you considering passing a constant current through the clamp in a wet environment?

BTW, these have been the standard "go to" clamp for this purpose for more years than I know of, and I have not seen one where galvanic corrosion has made a hole in the copper pipe.

In the UK, all copper pipes have to be bonded including gas pipe supply as well. The clamps are as you describe, with an aluminum label about 2" by 1" with an embossed warning that it is for earth bonding - can't remember the actual text but probably easy to find : google...

Fit it, making sure the copper is clean, free from paint etc otherwise the paint is an insulator.