MARELCO™ ICCP HULL PROTECTION SYSTEM (IMPRESSED CURRENT CATHODIC PROTECTION) For larger structures such as a Hull of a ship, the. Impressed Current Cathodic Protection (ICCP) of CORROSION Maritime, high quality protection against corrosion for maritime purposes. 2. Impressed Current Cathodic Protection (ICCP). ICCP is a more economical method of CP when underground pipelines are long or offshore equipment is too .

Author: Mektilar Galrajas
Country: Lebanon
Language: English (Spanish)
Genre: Finance
Published (Last): 24 January 2012
Pages: 108
PDF File Size: 11.85 Mb
ePub File Size: 19.64 Mb
ISBN: 802-3-33255-777-7
Downloads: 17242
Price: Free* [*Free Regsitration Required]
Uploader: Gogul

The reactive nature of these anodes makes them an efficient choice.

These include high silicon cast irongraphitemixed metal oxideplatinum and niobium coated wire and other materials. This is a form of localized cathodic protection – the zinc acts as a sacrificial anode. Therefore, the system is much more effective and reliable than sacrificial anode systems where the level of protection is unknown and uncontrollable.

The table below shows a simplified galvanic series which is used to select the anode metal. This phenomenon occurs because of the high electrical resistivity of these film backings.

Cathodic protection transformer-rectifier units for water tanks and used in other applications are made with solid state circuits to automatically adjust the operating voltage to maintain the optimum current output or structure-to-electrolyte potential.

Impressed Current Cathodic Protection

The system is made up of wired galvanic anodes in arrays typically mm apart which are then initially powered for a short period to restore the concrete and power ionic migration. Usually, copper when corroding releases copper ions which have an anti-fouling effect.

Sacrificial anodes made from iron attached to the copper sheath of the hull below the waterline dramatically reduced the corrosion rate of the copper. The following are some of the advantages of ICCP: More of your questions answered by our Experts. With respect to CUI, how well do thermal insulating coatings retard the spread of corrosion?

In a sacrificial anode system, increases in the seawater resistivity can cause a decrease in the prtoection output and a decrease in the amount of protection provided. Hence, a larger area of bare steel would only be protected around the edges. Another common application is in galvanized steelin which a sacrificial coating of zinc on steel parts protects cathodoc from rust.

  6ES7 214-1AD23-0XB0 PDF

Hydrogen atoms, however, are small enough to pass through the crystalline steel structure, and lead in some cases to hydrogen embrittlement. Wikimedia Commons has media related to Cathodic protection. With ICCP systems protection does not decrease in the range of standard seawater.

Impressed Current Cathodic Protection | JPBroomfield

For larger structures such as a Hull of a ship, the impressed current is evenly distributed over the entire wetted area of the Vessel. InFaraday discovered the quantitative connection between corrosion weight loss and electric current and thus laid prktection foundation for the future application of cathodic protection. Does not provide Marine Growth Protection.

Impressed current cathodic protection ICCP is a type of system usually applied where there are elevated current requirements for icpc against corrosion. This is a process of disbondment of protective coatings from the protected structure cathode due to the formation of hydrogen ions over the surface of the protected material cathode. Pipelines Boat hulls Storage tanks.

Cathodic shielding was first defined in the s as being a problem, and technical papers on the subject have been regularly published since then. This is often the case on smaller diameter pipelines of limited length. Sacrificial anode system in seawater.

The simplest method to apply cathodic protection is by connecting the metal to be protected with another more easily corroded metal to act as cathoic anode. The electrical current that is continuously regulated and monitored by the ICCP protetion helps prevent the electrochemical mechanism of galvanic corrosion prior to its attack. Although modern hull coatings provide some protection against corrosion they do not offer a complete solution.

Two dissimilar metals 2. Galvanic anodes are selected because they have a more “active” voltage more negative electrode potential than the metal of the target structure typically steel.

The advanced high frequency power unit is based on modular units. Corrosionpedia explains Impressed Current Cathodic Protection ICCP Impressed current cathodic protection works by delivering controlled amounts of DC current to the surfaces submerged in water with the aid of ultra-reliable zinc electrodes and combined anodes of metal oxide. Thermal sprayed zinc or aluminium alloy on the concrete surface Small potted zinc anodes in repairs or cored holes Zinc mesh in a permanent grp jacket Zinc sheet with a conductive adhesive Galvanic cp requires no power or monitoring but cannot be controlled, has indeterminate life and cannot guarantee protection What we can do for you Review the condition of your structure Recommend repair options Impressed current cathodic protection Galvanic cathodic protection Provide designs and performance specifications Provide lists of qualified and experienced contractors More information can be found in the latest edition of my book.


Several companies market electronic devices claiming to mitigate corrosion for automobiles and trucks. Due to the nature of the films which form, the minimum ASTM International publishes standards on the composition and manufacturing of galvanic anodes.

Cathodic protection CP is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. For pipelines, anodes are arranged in groundbeds either distributed or in a deep vertical hole depending on several design and field condition factors including current distribution requirements.

Smaller vessels, with non-metallic hulls, such as yachtsare equipped with galvanic anodes to protect areas such as outboard motors.

Cathwell: Basics pronciples of cathodic

To understand cathodic protection, you must first understand how corrosion is caused. This reaction is more commonly described as ‘current flow through the water from the anode more active site to the cathode less active site.

Are there any OSHA regulations that need to be taken into account when using thermal insulating coatings?