The Niobium is the anode electrode made of Niobium which is having the coating or Plating of platinum. Platinum is used on the surface as a primary anode material due to its excellent corrosion resistance under anodic conditions coupled with its ability to pass current in all electrolytes. The corrosion resistance of platinum manifests itself in its low consumption rate. Its major disadvantage is its high cost, thus making it clear that it is most desirable to use as little platinum as is necessary. In order to restrict the amount of platinum used and to maintain an anode of some structural integrity, it is necessary to use some type of substrate material.
Both titanium and niobium have the ability to withstand anodic conditions, and both possess unique advantages and disadvantages as a substrate for platinum.
The major advantage of titanium is its low cost, particularly when considering its lower density. A disadvantage of titanium is its poor conductivity; approximately 5 times less than niobium and 50 times less than copper. Low conductivity makes titanium poorly suited for long wire lengths and restricts its use to larger diameter, shorter anodes.
The use of niobium as a substrate to platinum eliminates many of the problems with titanium. Although its conductivity is higher than that of titanium, it is often still too low for use in small diameters and long lengths. The principal advantage of niobium is its relatively high voltage potential.
Material Considerations in Platinum Anode Design:-
Niobium (Nb): High cost, high breakdown potential, fair conductivity.
Titanium (Ti): Low cost, low breakdown potential, poor conductivity.
Platinum (Pt): High corrosion resistance, high cost, good conductivity.
Type of Anodes:-
Platinum Plated Niobium Tube Anode
Platinized Niobium Rod Anode
Platinised Niobium Wire Anode
Platinum activated Niobium Mesh Anode
Platinum Coated Niobium Sheet or Plate Anode
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