Cathodic Protection

Corrosion Behavior of UNS S31083 Duplex SS in China’s Yardang Soil

Due to the high carbon dioxide (CO2) and chloride content in natural gas produced by a gas field in Western China, a high-performance duplex stainless steel was chosen for gas gathering and transmission piping in this area.

Corrosion Basics: Close-Interval Potential Surveys

The principle of a close-interval potential survey is to record the pipe-to-soil potential profile of a pipeline over its entire length by measuring potentials at intervals that do not significantly exceed the depth of the pipe.

Fundamentals of Rectifier Operation, Monitoring, and Maintenance

Cathodic protection (CP) is an important component for the sustainability of many metal structures. The most common impressed current voltage sources are rectifiers, which can break down. Well-maintained rectifiers can provide uninterrupted CP, which reduces repair costs and labor/technician time.

An Alternative View of the Cathodic Protection Mechanism on Buried Pipelines

The application of CP polarizes steel in the electronegative direction, while raising the pH at the interface at the same time.

Assessing Galvanized Steel Power Transmission Poles and Towers for Corrosion

Generally speaking, galvanized steel can last for many years in nonaggressive environments, and typically does an excellent job of protecting steel when the structure is located in moderately corrosive environments where oxidizing conditions prevail.

Ultrasonic Probe Tests Zinc Galvanizing Kettles

New probe technology developed from recent academic research can conduct safety-critical testing inside galvanizing kettles holding molten zinc at 450 °C.

Coupons for Cathodic Protection Evaluation of Mixed-Metal Piping Systems

The measurement and interpretation of cathodic protection (CP) data in plants or other complex facilities present inherent challenges where mixed metals are electrically continuous within the protected structures’ CP system.

Retrofitting Wind Turbine Monopiles with Cathodic Protection

A strategy to provide wind turbine monopiles with a corrosion prevention system included resealing the J-tubes to prevent seawater flushing and installing a galvanic cathodic protection system inside the submerged section of the monopile.

Using Thermal-Sprayed Aluminum to Protect Deep Sea Steel Structures

Thermal-sprayed aluminum (TSA) coatings are applied on subsea assets to protect carbon steel (CS) from corrosion because they act as a barrier as well as provide sacrificial protection.

Applying Cathodic Prevention to Electric Transmission Tower Foundations

A novel approach is presented regarding corrosion assessment and cathodic prevention of foundations for electric transmission towers in the Persian Gulf region.

Historic Corrosion Tools Tell the Story of Early Corrosion Control

A collection of antique instruments illustrates the rich history of the East Bay Municipal Utility District’s corrosion department.

Electricity—Electrons vs. Conventional Current

Diagram of an electrochemical (corrosion) cell. Figure reproduced from the NACE Cathodic Protection—Tester (CP1) training manual.

Retrofitting an Offshore Jacket with Impressed Current Cathodic Protection

The North Cormorant oil and gas the platform is more than 35 years old, it still serves as a critical hub for major fields in the area. Several subsea surveys over the last several years, however, indicated a reduction in its corrosion protection via CP.

Protecting Concrete Wharves with Cathodic Protection

An impressed current cathodic protection system was installed and commissioned on several steel-reinforced concrete structures that support two of the Port of Brisbane’s wharves.

Challenges of Installing a New Pipeline

Once construction has commenced, several tasks are required to ensure a safe and successful pipeline installation with effective cathodic protection and mitigation of interfering current.