Roger, I like your "sacrificial" piece talk. That says it all. Sometimes I get the anode and whatever that other thing is called cornfused, I can't even remember what its called.
BUT, I can remember red rhymes with dead and that means "sacrificial". And since you only got two leads, and the red goes to the dead, that means the other one,the black one, goes to the piece you wanna clean, NOT sacrifice.
Sorry folks, I'm just a common man, drive a common van, my dog ain't got a pedigree. I do believe thats John Conally, I wouldn't swear to it though.