INSTITUTE OF CORROSION’s Post

Learn how cathodic protection prevents corrosion in harsh environments. Galvanic anode and impressed current systems offer unique solutions for safeguarding pipelines, offshore platforms, and more. Discover how these methods work and their benefits. #CathodicProtection #CorrosionPrevention #Engineering https://lnkd.in/gyQN25G

CATHODIC OVERPROTECTION Overprotection by use of cathodic protection can be a disaster for the applied paint/coating system. See the figure. From about -1100mV, (measured against a Copper/Copper sulphate, Cu/CuS04 cell), the painted Cathode (steel) will develop H2 Hydrogen gas and OH- alkaline. The gas will make blisters in the coating, which will later strip off the coating from the steel surface. This is also called Cathodic disbonding. The steel will however be overprotected and no corrosion will take place, due to the OH- alkaline. Overprotection can often be seen either very close to an Zn or Al anode or when use of wrong adjusted Impressed Current Systems. By use of Impressed Current System, a thick coating of epoxy or polyester are normally used around the anodes to protect the coating system from flaking. This method can also be to some help. Some years ago, a Shipyard had to clean some round gas tanks internal, in a new building, before delivering. The steel surfaces had got a thin layer of corrosion products. Instead of building expencive scaffoldings in the round tanks, I told them to fill the tanks with seawater, salt content ca 2,5%, and use Mg (Magnesium) anodes (stripping anodes) in the tanks. Because they give very negative Voltage, -1300mV, the Mg anodes will produce an overprotection. The steel bar inside the Mg anode was welded to the steel tank, to ensure a proper grounding. The tank surfaces were sufficient cleaned after the seawater was pumped out. The operation took some days. The steel surface was overprotected during the operation and was not harmed. The ship owner used the tanks for gas cargo, as they become, after steaming. The method can also be used for cleaning corroded water ballast tanks (e.g. fore- or after peaks), where blast-cleaning can be difficult to access. NB NB!! This method can be very dangerous, because of the H2 Hydrogen gas development, which can easy take fire and make an explosion. Therefore, sufficient ventilation is absolute necessary and no open flames, sparks or people shall be close to the fan outlet or the tank openings. If this method shall be used, it must be in close co-operation with the Mg-anode producer or local representative.

Exploring Galvanic Anode and Impressed Current Cathodic Protection Corrosion is a major challenge in maintaining the integrity of infrastructure in aggressive environments. Cathodic protection is a proven method to combat this issue, utilizing either galvanic anode or impressed current systems. Galvanic Anode Cathodic Protection (GACP) In GACP, sacrificial anodes made of zinc, aluminum, or magnesium are used. These anodes corrode in place of the steel, providing the necessary protection. This method is simple, reliable, and widely used in offshore structures and short pipelines. Impressed Current Cathodic Protection (ICCP) ICCP involves the use of a DC power source to drive the protection current. Anodes in ICCP systems are typically made from materials like mixed metal oxides coated on titanium. This system is ideal for large structures and long pipelines due to its ability to deliver higher currents. Choosing the appropriate cathodic protection method depends on various factors, including cost, environmental conditions, and the specific requirements of the structure. Both GACP and ICCP have their unique advantages and applications. The Institute of Corrosion provides specialized training to ensure professionals are equipped with the knowledge and skills to design and maintain effective cathodic protection systems. Proper implementation of these systems can greatly extend the life of critical infrastructure, ensuring safety and reducing maintenance costs. #CorrosionControl #CathodicProtection #Infrastructure https://lnkd.in/gyQN25G

Protecting pipelines under roads and railways from corrosion involves several strategies: 1. Coating: Use protective coatings, such as epoxy or polyethylene, to prevent moisture and chemicals from contacting the pipe. 2. Cathodic Protection: Implement sacrificial anodes or impressed current systems to protect the pipeline from electrochemical corrosion. 3. Backfill Materials: Utilize non-corrosive backfill materials that reduce moisture retention and improve drainage around the pipeline. 4. Regular Inspections: Conduct routine inspections and monitoring using methods like ultrasonic testing or smart pigs to detect early signs of corrosion. 5. Drainage Systems: Install drainage systems to direct water away from the pipeline area, minimizing moisture exposure. 6. Anode Installation: For buried pipelines, consider installing anodes at strategic points for enhanced protection. 7. Design Considerations: Use thicker-walled pipes in high-risk areas and avoid dissimilar metals that could lead to galvanic corrosion. Implementing these measures can significantly extend the lifespan of pipelines under roads and railways.

Where corrosion activity can occur on the internal surfaces of steel structures (vessels & pipes), Cathodic Protection (CP) is often used as a viable prevention solution. In many instances however, these systems have been designed and installed without consideration for future upgrades, repairs or maintenance. This often means that system componentry, such as anodes and reference electrodes, are permanently fixed to the inside faces of these structures in such a way that accessing them in future is unfeasible from both a practicality and occupational safety perspective, often necessitating plant shutdowns, drain down of areas to allow access with associated disruption to normal operations. This paper by Jack McLean and Tim Bettelley focuses on the challenges faced for asset owners and corrosion control practitioners when existing, inaccessible, cathodic protection systems for internal surfaces have reached the end of their design life. ➡ Read more → https://lnkd.in/dbemJymZ #CathodicProtection #SteelStructure #CorrosionControl #CorrosionPrevention #ACA #Corrosion  

Different methods of corrosion protections and control. #corrosion #corrosionprotection #corrosioncontrol

Is It Necessary To Coat Pipelines? Corrosion poses a significant risk to buried steel pipelines, often resulting in leaks, service disruptions, and even explosions. It is essential to recognize that corrosion can arise both internally and externally, influenced by several factors. In addition to the pipeline's age, corrosion can stem from one or multiple factors, including: #Environment #Hydrocarbon chemical makeup #The temperature of the materials being transported #Flow velocity #Pipe composition #Pipe diameter Coating pipelines is a common and essential practice in the oil and gas, water, and various other industries. While it might not be strictly necessary for all types of pipelines, coating is widely recommended and implemented for the following reasons: #Corrosion protection #Extended life service #Environmental protection #Reduced maintenance cost #Enhance pipeline performance #Preservation of product quality #Safety considerations Over the years, pipeline design has undergone significant changes. The effectiveness of certain standards has been proven to be superior to others. However, it doesn’t necessarily mean a pipeline is #safer because it’s #newer. Reach out to #EcoAlphaSolutionsLimited to protect your industrial equipment, machinery and pipelines from corroding and ensure their longevity. #corrosionprevention #industrialequipment #preventativemeasures #chemistry #coatingsindustry #pipelines www.ecoalphasolutions.com +233 594 015 019 +233 594 016 594 +233 594 0163 63 +233 594 011 708 +233 302 903 348

The Role of Galvanic Anodes in Cathodic Protection Cathodic protection (CP) is a vital technique in combating corrosion in steel and iron structures. One primary method of CP is the use of galvanic (sacrificial) anodes. These anodes are made from more active metals like aluminum, zinc, and magnesium. When connected to the metal surface, the galvanic anode corrodes preferentially, providing a protective current that turns the metal surface into a cathode, thus preventing corrosion. Galvanic anodes are particularly effective for smaller structures such as ballast tanks, ship hulls, and pipelines. They are easy to install and require minimal maintenance, making them a cost-effective solution for corrosion prevention. In the field of paint technology, zinc-rich primers act similarly, where the zinc particles corrode to protect the steel substrate. Understanding the application and benefits of galvanic anodes is crucial for professionals working with metal structures. These anodes not only extend the lifespan of the metal but also enhance the effectiveness of protective coatings. #CathodicProtection #CorrosionControl #Engineering https://lnkd.in/dkjNrfKK

The Role of Cathodic Protection in Safeguarding Infrastructure Cathodic protection plays a crucial role in preventing corrosion, ensuring the longevity and safety of infrastructure in harsh environments. There are two main types of cathodic protection systems: galvanic anode and impressed current. Galvanic Anode Cathodic Protection (GACP) GACP uses sacrificial anodes made from more active metals such as zinc, aluminum, or magnesium. These anodes corrode instead of the steel, providing effective protection. This method is particularly useful for offshore structures and short pipelines. Impressed Current Cathodic Protection (ICCP) ICCP employs a DC power source to provide the protection current. Anodes in ICCP systems are made from durable materials like mixed metal oxides on titanium. This system is suitable for larger structures and longer pipelines, offering higher current outputs. Both methods require careful consideration of factors such as cost, environmental conditions, and specific project requirements. Proper design, installation, and maintenance are essential for the effectiveness of cathodic protection systems. The Institute of Corrosion offers comprehensive training programs for professionals in the field. These programs ensure that specialists are well-equipped to manage cathodic protection systems, ultimately extending the life of critical infrastructure and enhancing safety. By understanding and utilizing cathodic protection, we can significantly reduce the impact of corrosion, ensuring the reliable operation of vital structures in various industries. #CathodicProtection #CorrosionPrevention #EngineeringSolutions https://lnkd.in/gyQN25G

Corrosion Protection & Control Techniques For Pipelines Methods for protecting and controlling corrosion in metallic pipelines are crucial. These pipelines, used for water and/or oil/gas transportation, face risks like deterioration, leaks, bursts, and failures caused by corrosion. Employing effective corrosion protection techniques is vital, especially in harsh environments and corrosive soils. Doing so not only prevents corrosion but also minimizes pipe deterioration, leaks, breaks, and failures, ultimately extending the pipeline's lifespan and enhancing the transportation process. #pipeline #pipelinesintegrity #assetintegrity #corrosion #inspection #cathodicprotection