Impressed Current Cathodic Protection

IMPRESSED CURRENT CATHODIC PROTECTION
Scene #1:
- In Sacrificial Anode Cathodic Protection systems, galvanic anodes are connected to a metallic structure and supply DC current to it.
- The structures that receive current are cathodically protected from corrosion.
- The galvanic anodes, on the other hand, corrode as they discharge current.
- As the size of the structure grows, more galvanic anodes are required to supply enough current to protect the structure.
Scene #2:
- In large applications, many galvanic anodes are needed to provide the required current.
- In these cases, Sacrificial Anode Cathodic Protection systems are not cost-effective.
- Some examples of larger applications are bridges, skyscrapers, large ships, dams and pipelines.
Scene #3:
- To mitigate corrosion in these systems, we need a source of more DC current.
- The Solution?
- Impressed Current Cathodic Protection.
Scene #4:
-In an Impressed Current Cathodic Protection System,
- We replace galvanic anodes with non-consumable, inert, impressed current anodes.
- We use a rectifier to supply DC current.
Scene #5:
- The rectifier allows us to supply enough DC current to protect the structure by adjusting the rectifier output voltage.
- Too little current, and the structure is vulnerable to the corrosion we want to mitigate.
- Too much current, and the structure is vulnerable to overprotection.
Scene #6:
- Overprotection is not just a matter of wasted power.
- It can cause coating separation, structure brittleness, and surface deposits (in marine environments).
- It can even cause alkaline conditions which promote the corrosion we’re trying to prevent.
- Therefore, not only is proper design important, but also close monitoring of the system.
Scene #7:
- Reference electrodes are often permanently installed as a part of the Impressed Current Cathodic Protection system.
- Reference electrodes provide important feedback about how well the system is performing.
- They are used to tune the power settings on the rectifier.
- They are used for periodic monitoring throughout the life of the structure.
- They help us determine if the system is operating correctly.
Scene #8:
- Both Sacrificial Anode and Impressed Current Cathodic Protection systems are effective methods of mitigating corrosion.
Scene #9:
- Sacrificial Anode Cathodic Protection systems are typically used for applications where the current requirements are small.
- They are also suited for structures that are buried or placed in soil with low resistivity.
- Some of these applications could be small storage tanks, small boats, ballast tanks and initial installations of offshore structures.
Scene #10:
- Impressed Current Cathodic Protection systems are typically used for applications with large current requirements.
- These applications could be buried pipelines, large ships, retrofitting of offshore structures and concrete-rebar structures.
- Impressed Current Cathodic Protection systems are also more cost-effective for structures buried in soil.
Need Cathodic Protection Expertise or Materials to Protect your Structure?
Allied Corrosion Industries, Inc. offers a complete range of Cathodic Protection, Corrosion Control and Pipeline Integrity Solutions.
Website: www.alliedcorrosion.com/
Toll Free: 1-800-241-0809

[@ituen]

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[@Moondisapear]

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[@vignesht1767]

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