Profile: Zinc Warehouse specializes in providing product design services for anode industries. Sacrificial anode is simply a disposable metal attached to boats underwater metals, that will sacrifice itself (corrode) first in order to prevent the important metals corroding. A sacrificial anode is commonly referred to as zinc however zinc is not the only anode that protects underwater metals, aluminum and magnesium are also used. A sacrificial anode when secured to the propeller or drive shaft is now the most active metal in the system and corrodes before the expensive metals.