Anodes - PLATINIZED
Platinized Niobium Wire Anodes
Protection For Water Storage Tanks
Waterworks facilities are constantly under attack from corrosion. To combat this process in water and wastewater storage tanks, Corrpro offers a platinized niobium wire anode. The anode is constructed of a copper core, which is surrounded by a niobium substrate. Metallurgically bonded to the substrate is a platinum coating. By using these three metals in combination, an anode with superior protection characteristics is produced. Corrpro’s wire anode is highly conductive and can be operated at a maximum current density of 100 amps/ft2. The anode is also very lightweight, flexible, and strong. Because the niobium substrate is resistant to corrosion, the anode remains dimensionally stable over its operating life, and consumption of the platinum coating is extremely low (40 to 80 milligrams/amp-yr.).
Corrpro wire anodes can be used in numerous geometries. In water storage tanks and wastewater clarifiers, the anode is often suspended by rope in configurations which follow the circumference of the structure. This design permits even current distribution. It also produces a cathodic protection system that is not susceptible to damage from icing. Because the anode is a continuous wire, failures due to poor wire connections are eliminated.
Typical Applications
Corrpro platinized niobium wire anodes are designed for use in all types of aqueous storage and process equipment. The anode has proven to operate effectively in fresh, brackish and saltwater, and is not adversely affected by high chloride concentrations. Because of its low consumption rate, the anode may be employed in a cathodic protection system to achieve a design life of 20 years or more.
Chemical Composition |
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| Element | Content % of Diameter |
| Copper | 79.5 |
| Niobium | 19.5 |
| Platinum | Less than 1% |
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Platinized Niobium/Titanium Probe Anodes
For Confined Installation Areas
In steel vessels, such as condenser water boxes, heat exchangers, and heater treaters, where access is difficult and space is limited, Corrpro manufactures platinized probe anodes for thrushell mounting. The anodes are made using either titanium- or niobium-rod substrates, which are covered with a platinum coating. An oxidizing film inherently coats the surface of titanium and niobium, assuring that the substrates will remain stable, and will not change shape or be consumed during operation. The film also makes the substrate surface relatively nonconductive, and electrical discharge therefore occurs through the platinum coating. The coating is electroplated to the substrates in thicknesses ranging from 100 to 300 microinches, and is consumed at a rate of 8 to 16 mg/amp.-yr. in saltwater environments. The recommended current density for both types of probe anodes is between 50 and 300 amp./ft.2 in saltwater electrolytes. The voltage across the titanium or niobium at the electrolyte interface, however, should not exceed the breakdown voltage of the protective oxide.
Corrpro probe anodes are manufactured with a proven thru-shell assembly. The assembly consists of a stainless steel nipple filled with a moisture-resistant sealant. Once the anode is placed in this metal nipple and filled with the sealant, it is then bonded with G-10 fiberglass. The fiberglass resists water flow and lends extra support to the anode. Prior to shipping, each anode connection si pressure tested to ensure a tight seal. The anodes are also adaptable for mounting while the vessel is under pressure.
Typical Applications
Probe anodes are designed for use in heater treaters, pressure vessels, condenser water boxes, and other aqueous processing tanks where high temperatures and pressures may exist. The two types of substrates, niobium and titanium, provide Corrpro probe anodes with exceptional resilience. They also permit the anodes to operate in temperatures up to 175°C, and to perform well in chloride environments. Neither type should be used in highly acidic electrolytes.