Anodes are said to be the consumables which are used in a wide range of electrochemical processes like corrosion protection through sacrificial anodes and electroplating through plating anodes. You can find Anodes with a great variety of compositions intended for different applications. The anode are usually made of the material like brass, aluminum, bronze, magnesium, copper, zinc, titanium or numerous other alloy systems with a combination of these metals. However, you can find Titanium anodes and other titanium alloy anodes combine good corrosion resistance and are valued for their greater strength-to-weight ratio.
Basically there are three types of metal anodes now used for different applications.
At First, the Sacrificial anodes. It is also known as offshore sacrificial anodes, applicable for the use of cathodic protection. As the name suggest, it will decay in wear and tear during a period of time of its usage. Here the metallic element or alloy used for the anodes metal are made of the metal which can corrode very easily as compared to the metal it protects. In the process the electrons of the sacrificial anode are removed and conducted to the protected metal, which becomes the cathode protection. As reduction occurs on the protected layer of metal’s surface thus the cathode is protected from oxidation. Sacrificial anodes are best suited for the area of application like used in vessels, marine and naval applications.
Plating anodes, on the other hand, are used chiefly in plating and electroplating kind of applications. usually, this type of plating anodes as well as electroplating anodes are made of mostly from the metal like brass, cadmium, lead, copper, nickel, zinc and tin. Whereas the alloys used for these metal anodes consist of cadmium-tin, copper-zinc, copper-tin, tin-lead, zinc-aluminum, tin-zinc, zinc-nickel and zinc-magnesium.
The last one is the mixed metal oxide electrodes. This is the result of an oxide coating over an inert metal. The coated material is oxides often consist of precious metal like Ir, Ru, and Pt.
Titanium oxides are suitable for electrode corrosion protection and inertness. However the process of Titanium oxides electrodes is not very expensive as well. In industrial field Electrochlorination is a very common application in which the core metals is titanium, and the most commonly with the combination of niobium, zirconium, or tantalum.
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