I saw a 16mm film on the galvanic series in 8th grade shop in 1964.

I bid some military contracts in the 1980s that had MIL-STD-889 dissimilar metals requirements.

In 1984 I build the world's fasted filling big bathtub. I had galvanized and brass adaptors in series to get 1/2" and 3/4" copper pipe connected to ball valves that looked like 1/2" or 3/4" holes. But every time I turned on the water the first gallon of water was all rusty. I had to take it apart and make it without the steel parts.

So I had no excuse when I put some brass pillars in rifles in 2002. Later I realized my barrelled action was a sacrificial anode.

I am now not afraid to put Aluminum pillars in rifles, and let the pillars be sacrificial while protecting my barrelled action.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps