steel wool circuits

steel wool is highly flammable, recommended for bringing along on camping trips to start a fire, even in wet conditions.

silver corrodes

metal conductivity chart

metal corrosion chart
corrosion website

It’s best to get away from steel, I found aluminum and bronze wool that comes in affordable amounts here.

Here is an explanation given by lustersheen as to why bronze is better than steel wool:
“Unlike steel wool, which leaves behind small fibers that can rust and discolor wood in corrosive marine environments, Bronze wool resists shedding, rust, and corrosion.”