Corrosion is controlled by making the metal structure become a cathode of an electrochemical cell. By doing so, the lifespan of the metal instrument is extended, and its functionality is also improved. When the metal structure undergoes protection using an anode, it is more durable than when it has not experienced this process. This technique is mainly done to the metals structures buried in the soil or immersed in water.
These structures include those in larger industries like water pipes, fuel pipes, ships, tanks and boats. If the surfaces of these instruments erode, there is the possibility of failure in their functioning, leading to accidents like fuel and water leakage. A sacrificial anode is a metal that supplies the current to the buried and submerged metal objects. It is a protective metal for metal structures.
These anodes oxidize faster than the metals they are protecting and end up being consumed very quickly. Because of this consumption, they need regular replacement. Some of the commonly used sacrificial anodes are magnesium, zinc, and aluminum. The question of how cathodic protection works is commonly asked by many. The following statement shows what it takes and how cathodic protection works.
The sacrificial anodes should be highly active metals. They should have a more negative electrochemical potential than the metal structure that they are protecting—the amount of current provided by the direct source of current influences the level of corrosion. New brake disc with an anti-corrosion layer from Elements Envato License.
There are two basic ways this is achieved, and both methods are effective when used appropriately by experts. These ways are;. Oil pipeline from Elements Envato License. The surface grounds can be installed either horizontally or vertically then connected to a power source.
The shallow anode ground beds are installed where the deep anode ground beds cannot be installed. The shallow anode ground beds are straightforward to establish when a single continuous linear anode is used. It is very reliable because the anode assembly is manufactured in a factory and tested.
Read more about level of cathodic protection. Cathodic protection involves polarisation of a metal towards more reducing potentials. Antifouling anodes in the mud box lids to prevent fouling. Cu anodes in pair with Al or Fe anodes to prevent fouling. Open menu icon-hamburger. Go to cart. My account My orders My account Log in.
Back Close menu. Go to front page Products All products. Anode shield. Control panels. Reference cells. Sacrificial anodes. Brackets and clamps. Shaft grounding. Floating offshore units. Offshore subsea units. Sea cables. Storage tanks. Wind turbines. ICCP for hull.
Sacrificial anodes for hull and tanks. Ultrasonic antifouling. Sacrificial anodes for hull. Sacrificial anodes for tanks.
ICCP for external area of foundations. Cathodic protection is used extensively to protect critical infrastructure from corrosion. For example:. However, across all functions — from design through installation to testing and maintenance — cathodic protection is highly specialised. A key takeaway from the standards is that they make it clear that cathodic design must be undertaken by cathodic specialists with a documented, appropriate level of competence.
There are no degrees that can be gained in cathodic protection, and there are no postgraduate courses in cathodic protection engineering, either. Instead, you find that cathodic protection specialists may hold a science or engineering degree or complete an apprenticeship before undertaking specific training and gaining experience and expertise in cathodic protection.
The Institute of Corrosion offers courses in cathodic protection, providing the training required for levels 1 to 3 for cathodic protection data collectors, technicians and senior technicians.
This is recognised internationally as confirmation of experience, knowledge and task skills as defined in standard BS EN ISO ; it is valid internationally. For cathodic protection companies and for independent cathodic protection specialists, attainment of cathodic protection training and certification will ensure demonstration of competence, experience and expertise.
This translates into more effective work, improving reputational excellence, and more employment opportunities. To learn more about our range of cathodic protection training courses and the experience and qualifications needed for certification, please visit our pages detailing the Cathodic Protection, Training, Assessment and Certification Scheme. Facebook Twitter Instagram Linkedin. Cathodic protection methods — differences and similarities In our last article, we examined electrochemical corrosion and introduced the major areas where cathodic protection is used to protect against corrosion in aggressive environments such as soils, waters, and chloride contaminated concrete.
In this article, we take a deeper dive into how cathodic protection works. The two types of cathodic protection There are two types of cathodic protection: galvanic anode and impressed current cathodic protection.
Galvanic anode cathodic protection GACP Galvanic anode cathodic protection works as summarised above. Impressed current cathodic protection ICCP Impressed current cathodic protection is provided by connecting a DC power source between the metal being protected and the cathodic protection anodes.
Most impressed current systems will require replacement after about 25 years.
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