Arcing will very quickly hole (destroy) gold plating. Arcing will happen every time you install or remove a plug with current applied (i.e. power switch on). However, that should not be a significant issue for a power plug IF the equipment is off when plugging in or out. There are a lot of very good reasons to NOT plug in (or unplug) a component with the power on, and that is one of them.
For musical instruments gold is not plated on brass as we want a harder finish underneath, thus gold plating is usually applied over silver. For electrical contacts, I usually see gold applied over nickel or chrome alloys as they are harder than silver. However, no matter the undercoat, an arc can wipe out the gold in the region of the arc.
For musical instruments gold is not plated on brass as we want a harder finish underneath, thus gold plating is usually applied over silver. For electrical contacts, I usually see gold applied over nickel or chrome alloys as they are harder than silver. However, no matter the undercoat, an arc can wipe out the gold in the region of the arc.