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 .

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The table below shows a simplified galvanic series which is used to select the anode metal. Some cathodic protection transformer-rectifier units are designed with taps on the transformer windings and jumper terminals to select the voltage output of the ICCP system.

From Wikipedia, the free encyclopedia. A side effect of improperly applied cathodic protection is the production of atomic hydrogen[42] leading to its absorption in the protected metal and subsequent hydrogen embrittlement protecrion welds and materials with high hardness.

Several companies market electronic devices claiming to mitigate corrosion for automobiles and trucks. In the absence of an AC supply, alternative power sources may be used, such as solar panels, wind power or gas powered thermoelectric generators.

For corrosion to occur, three things must be present: This page was last edited on 3 Decemberat More information can be found in the latest edition of my book. When the most active metal anode supplies current, it will gradually dissolve into ions in the electrolyte, and at the same time produce electrons, which the least active cathode will prtection through the metallic connection with the anode.

History has shown that if steel receives enough current to shift the potential to – 0. Effectiveness of cathodic protection Ctahodic systems on steel pipelines can be impaired by the use of solid film backed dielectric coatings such as polyethylene tapes, shrinkable pipeline sleeves, and factory applied single or multiple solid film coatings.

The free electrons travel through the metal path to the less active sites, where the following reaction takes place: The advanced high frequency power unit is based on modular units. Our ICCP systems are often designed with multiple independent zones of anodes with separate Cathodic reference electrodes.

When two metals are electrically connected to each other in a electrolyte e. If the above conditions exist, the following reaction takes place at the more active sites: Home Dictionary Tags Cathodic Protection.


For pipelines constructed from pre-stressed concrete cylinder pipe PCCPthe techniques used for cathodic protection are generally as for steel pipelines except that the applied potential must be limited to prevent damage to the prestressing wire. The usual technique for concrete buildings, bridges and similar structures is to use ICCP, [26] but there are systems available that use the principle of galvanic cathodic protection as well, [27] [28] [29] although in the UK at least, the use of galvanic anodes for atmospherically exposed reinforced concrete structures prtection considered experimental.

In general, long, thin anodes have lower resistance than short, fat anodes. Webarchive template wayback links All articles with icp statements Articles with unsourced statements from December Commons category link is on Wikidata.

This is a form of localized cathodic protection – the zinc acts as a sacrificial anode. This practice is also referred to as a sacrificial system, since the galvanic anodes sacrifice themselves to protect the structural steel or pipeline from corrosion. Furthermore, the weight and size cathodc this new power unit are reduced tremendously.

The choice of groundbed type and size depends on the application, location and soil resistivity. In order for galvanic ptotection protection to work, the anode must possess a lower that is, more negative electrode potential than that of the cathode the target structure to be protected. The following are some of the vathodic of ICCP: Click here to design your tank ring anode system! For most applications, the metal resistance is so small compared to the water resistance that it can be ignored although this is not true for sleds or long pipelines protected from both ends.

Recombinations of these ions at the active surface produce the following reaction, which yields the iron-corrosion product ferrous hydroxide: The DC cathodic protection current is then adjusted to the optimum level after conducting various tests including measurements of pipe-to-soil potentials or electrode potential. With respect to Pfotection, how well do thermal insulating coatings retard the spread of corrosion?

The output of the ICCP system should be optimised to provide enough current to provide protection to the target structure. All data can be downloaded to an external computer and transferred by Internet for checking. Protecton there CUI concerns for operating temperatures over degrees F?

This eliminates the formation of aggressive corrosion cells on the surface of plates and avoids the problems cathodkc can exist where dissimilar metals are introduced profection welding or brought into proximity by other components such as propellers.


It is sometimes more economically viable to protect a pipeline using galvanic sacrificial anodes. In a sacrificial anode system, increases in the seawater resistivity can cause a decrease in the anode output and a decrease in the amount of protection provided.

Impressed Current Cathodic Protection

Protecrion consist of anodes connected to a DC power source, often a transformer-rectifier connected to AC power. Sacrificial anode system in seawater. Although modern hull coatings provide some protection against corrosion they do not offer a complete solution. This is used in cases where the driving voltage is higher than the galvanic system or if there is a need for increased system control.

Impressed-current cathodic-protection system in seawater. Vessels, pipelines and tanks which are used to store or transport liquids can also be protected from corrosion on their internal surfaces by the use of cathodic protection. Some ships may require specialist treatment, for example aluminium hulls with steel fixtures will create an electrochemical cell where the aluminium hull can act as a galvanic anode and corrosion is enhanced. The sacrificial metal then corrodes instead of the protected metal.

Cathodic protection – Wikipedia

Under normal conditions, the atomic hydrogen will combine at the metal surface to create hydrogen gas, which cannot penetrate the metal. The main advantage of an ICCP system is its automatic control feature, which continuously monitors and varies the current required for corrosion protection. A metal conducting path between the dissimilar metals The two dissimilar metals may be totally different alloys — such as steel and aluminum — but are more likely to be microscopic or macroscopic metallurgical differences on the surface of a single piece of steel.

The ICCP System will give adequate corrosion protection to the hull of a ship over the life protectikn the vessel in conjunction with a compatible protective coating system. Pipelines Boat hulls Storage tanks. For this reason, most operators choose to protect their vessels with a purpose designed impressed current cathodic protection system.

Skip to content Call: Over time the galvanic catohdic continues to corrode, consuming the anode material until eventually it must be replaced. There is extensive literature on the subject as well as national and international standards and specifications.