Aluminum and mild steel would be bad, but we are talking short exposure time. I'd dismantle the pot after each brew, clean and dry all parts, then reassemble.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk