we need to prevent the corrosion of a machine in the mountains, the machine polishes the surface of stone. it uses rotating disks and a lot of water. also it is an old machine with some parts having lost up to 1 mm in thickness due to rust. we are trying to find a passive corrosion protection technique and so far we have found water treatment (adding corrosion inhibitors to the water used by the machine). i'm simply asking about other passive techniques and especially whether we can use sacrificial anode technique (or similar methods) in open air.