Cathodic Protection & Electrochemical Techniques for Corrosion Control in Process Plants

Cathodic Protection & Electrochemical Techniques for Corrosion Control in Oil & Gas, Chemicals, Fertilizers, Petrochemicals, Power Plants, Infrastructure, etc.



Corrosion is deterioration of a material, usually metal, that results from a chemical or electrochemical reaction with its environment.
Three components responsible for corrosion:
1. Material to be corroded
2. Chemical or electrochemical reaction
3. Surrounding environment
 
1. Metal usually high carbon steel used in oil and gas pipeline
2. Chemical or electrochemical reaction: Chemical or electrochemical reaction takes place between metal and environment that contains moisture, oxygen and other chemicals which results into decay in metal that is called corrosion.
3. Environment: The surrounding environment responsible for electrochemical reaction is called electrolyte containing moisture, oxygen and other chemicals.
 
CORROSION CELL
  • Corrosion is an electrochemical process involving the flow of electrons and ions. Electrons are negatively charged particles and ions are electrically charged atoms either positive or negative.
  • Electrochemical Corrosion is due to transfer of charged ions at metal/electrolyte interface which is anode and other part of metal is called cathode.
  • Corrosion occurs at anode and cathode is protected.
  • Corrosion occurs within a corrosion cell that consists of four parts:
                    1. Anode
                    2. Cathode
                    3. Electrolyte
                    4. Metallic Path
 
  • If any of the above is absent then corrosion ceases to exist
  • Corrosion protection methods are based on isolating either one of them or stopping electrochemical reaction which causes corrosion.
URL: https://marcepinc.com/blog/cathodic-protection-&-electrochemical-techniques-for-corrosion-control-in-process-plants

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