Changes

: [[Corrosion]] of a [[metal]] [[object]] can also be prevented using a [[Sacrificial Anode]] which is a [[metal]] more [[Reactivity Series|reactive]] [[metal]] placed in [[Electrical Contact|electrical contact]] with the [[object]]. This prevents [[Oxidation]] of the [[object]] because the more [[Reactivity Series|reactive]] [[metal]] has a greater tendency to form [[Positive Ion|positive ions]] causing it to [[Oxidation|oxidise]] instead of the [[object]].