![]() For structures such as long pipelines, where passive galvanic cathodic protection is not adequate, an external DC electrical power source is used to provide sufficient current.Ĭathodic protection systems protect a wide range of metallic structures in various environments. The sacrificial metal then corrodes instead of the protected metal. A simple method of protection connects the metal to be protected to a more easily corroded " sacrificial metal" to act as the anode. ![]() The video below offers a simple representation of ICCP.Zinc sacrificial anode (rounded object) screwed to the underside of the hull of a small boat.Ĭathodic protection ( CP / k æ ˈ θ ɒ d ɪ k/ ( listen)) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. Trenton Wax Tape is an anti-corrosion tape that supports the cathodic protection of oil and natural gas pipelines. If you are interested in a TEG for a CP system, Global Power Technologies specialize in them. Thermoelectric generators (TEGs) provide cost-effective, reliable, and continuous electrical current to difficult-to-reach CP sites. Thermoelectric Generator (TEG) for Cathodic Protection Joint Isolationįlange isolation and joint isolation are two ways of preventing electrochemical reactions from occurring between two different metals by breaking the metal path or preventing the current in the cathodic protection (CP) system from traveling beyond the area protected by the CP system. The Rhino HideOut is an underground (CP) cathodic protection test station that offers excellent visibility, is durable, locatable, and installs flush with the ground eliminating mower interference. ![]() Products to Support CP Systems Underground CP Test Station The anodes (Magnesium, Zinc, or Aluminum) are the electron source and are sacrificed and corrode over the steel pipeline. Sometimes it is more economical to use a galvanic anode system. Since the anodes do not surrender many electrons, they do not rust much either. The rectifier (a DC power source) supplies electrons to the system stopping corrosion of the pipeline. Pipelines commonly use Impressed Current Cathodic Protection (ICCP), which uses a rectifier and anodes buried in the ground. The science reveals that corrosion will be prevented or significantly slowed as long as the flow arrives at the cathode (pipeline) faster than oxygen. By supplying an electric current, the line becomes passive or cathodic. A pipe usually is anodic it contains positively charged particles. The first step in cathodic protection is to take the metal you are trying to protect (pipeline) and turn it into a cathode. Otherwise, the cathodic protection required to combat corrosion for an uncoated pipeline is excessive. We supplement pipelines with CP after being protected with an anti-corrosion system (coating or wrap), such as Trenton Wax Tape, as the primary form of corrosion protection. To simplify cathodic protection, assume you have a metal pipeline, and you need to protect it against corrosion. Typical applications applying this science are fuel tanks, pier pilings, ships, offshore oil platforms and casings, metal reinforcement bars for concrete structures, and pipelines. Cathodic protection (CP) is used to control a metal substance’s corrosion in various applications.
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