How does an ICCP system work?

How does an ICCP system work?

ICCP Systems work by taking the ship�s power, converting it using as a transformer rectifier unit into direct current and impressing this on to the hull through inert anodes strategically positioned on the hull. The current will flow from the inert anodes through the sea water and back to the hull.

How does Impressed current prevent corrosion?

Cathodic protection (CP) is a means to prevent corrosion by applying a flow of electrical current from an external source (anode) through the environment and on to the metallic structure that is being protected. This protective current changes the environment around the metal thus halting the corrosion reaction.

What is anodic and cathodic protection?

Cathodic protection converts all anodic areas on a metal surface to cathodes so that corrosion ceases. Anodic protection, on the contrary, makes the entire metal surface an- odic-so anodic that the metal completely passivates. Obviously, then, this technique is limited to metals that can form protective passive films.

Which metal is used for cathodic protection?

The simplest method to apply cathodic protection is by connecting the metal to be protected with another more easily corroded metal to act as the anode. Zinc, aluminium and magnesium are the metals commonly used as anodes.

How does impressed cathodic protection work?

Impressed current cathodic protection is provided by connecting a DC power source between the metal being protected and the cathodic protection anodes. As with GACP, the cathodic protection current flows from the anode, through the electrolyte and onto the metal being protected.

What is cathodic protection explain impressed current cathodic protection?

Impressed current cathodic protection (ICCP) is a corrosion protection system consisting of sacrificial anodes connected to an external power source. The external power source, often a DC power supply, provides the current necessary to drive the electrochemical reaction required for cathodic protection to occur.

Where is cathodic protection used?

Cathodic protection is commonly used to protect numerous structures against corrosion, such as ships, offshore floaters, subsea equipment, harbours, pipelines, tanks; basically all submerged or buried metal structures.

Which of the following are types of cathodic protection?

Types of cathodic protection are i. External impressed current supply ii. Sacrificial anode.

What is cathodic protection?

Cathodic protection is the use of DC Current from an External Source to oppose the discharge of corrosion current from anodic areas of the structure. It minimizes the potential difference between anode and cathode and in turn reduces corrosion.

How does impressed current cathodic protection work?

In case of impressed current cathodic protection, a source of DC current is installed in the system which provides additional energy to force the current flow from an installed anode to the pipe or structural material making it a cathode. DC source can be a solar cell, rectifier, generator, battery, or some other DC power.

What is the function of external power source in cathodic protection?

The external power source, often a DC power supply, provides the current necessary to drive the electrochemical reaction required for cathodic protection to occur. In the absence of a DC power source, a transformer-rectifier connected to AC power can be used.

When to use a sacrificial anode cathodic protection system?

In general, when the soil resistivity is low (< 5000 ohm-centimeters) and the current density requirement is low, a sacrificial anode cathodic protection system is selected. However, for large structures with larger current requirement, a properly maintained impressed current system is used.