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 sacrificial anode suitable for deep sea environment and a preparation method thereof, the aluminum alloy sacrificial anode is composed of aluminum, zinc, indium, magnesium and titanium, according to the weight parts of aluminum 91-95 parts, zinc 6-8 parts, indium 0.04-0.06 parts, magnesium 1.0-2.0 parts, titanium 0.07-0.09 parts; Compared with the aluminum alloy sacrificial anode produced by GB4948-2002 "Aluminum-Zinc-indium alloy sacrificial anode", the sacrificial anode suitable for deep sea environment has longer service life, stable working potential, uniform dissolution topography and high current efficiency. The preparation method is simple and suitable for large-scale industrial production.
The auxiliary anode is a key component of the impressed current cathodic protection system. Because reinforced concrete structures and application media have become an indispensable part of the use of aluminum alloy surface treatment, and anodizing is currently widely used and successful. Cathodic protection In relation to the parts of the ship in direct contact with the sea water, the steel hull is electrically connected with a metal or alloy with a lower electrode potential than that of steel, so that it becomes a cathode in all aspects; Or continuously add a direct current to the steel hull in the opposite direction of the corrosion current generated when the steel is corroded.