Some people often ask if magnesium can be a sacrificial anode, so whether aluminum can be a sacrificial anode, we will give you the answer yes, in principle, all metals can be cathodic protection. That is, any metal can be used as a sacrificial anode. But the key depends on what material you want to protect the cathode, the electrode potential of the cathode is higher than the zinc aluminum alloy, the electrode potential of magnesium is -2.375V, the electrode potential of aluminum is -1.706V, the electrode potential of zinc is -0.763V, the electrode potential of iron is -0.409V, and the electrode potential of copper is +0.340V. Zinc-aluminum alloy can only be considered at a higher -0.763V, aluminum alloy sacrificial anode, then if the zinc-aluminum alloy as a sacrificial anode, aluminum alloy sacrificial anode, then can be used to protect iron and copper and other metals, but can not protect magnesium.

Aluminum alloy anode production GB4948-2002 "Aluminum-Zinc-indium alloy sacrificial anode". 
 Aluminum alloy sacrificial anode has very high electrochemical performance, and the power generation per unit weight of anode material is large, about 3 times that of zinc anode and 2 times that of magnesium anode. In seawater and other media containing chloride ions, it has good performance and strong self-regulating ability of sending current.

Aluminum anode can prevent the corrosion of steel structure in seawater and fresh water, and it is suitable for the cathodic protection of metal corrosion prevention of ships, machinery and equipment, marine engineering and port facilities in seawater medium, as well as seawater pipelines, hulls, ballast tanks, storage tanks, drilling platforms, pipelines in sea mud, cables and other facilities.