What is cathodic protection systems?
Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathodic side of an electrochemical cell. The simplest method to apply CP is by connecting the metal to be protected with another more easily corroded metal to act as the anode of the electrochemical cell.
What are two methods of supplying cathodic protection?
There are two types of cathodic protection: galvanic anode and impressed current cathodic protection. Both provide a cathodic protection current flow from cathodic protection anodes placed within the same electrolyte as the metal to be protected.
What industries use cathodic protection?
The oil and gas industry, in particular, uses cathodic protection systems to prevent corrosion in fuel pipelines, steel storage tanks, offshore platforms, and oil well casings. In the marine industry, this protection method is also used on steel piles, piers, jetties and ship hulls.
How is cathodic protection different from galvanization?
In cathodic protection, the iron object is made cathode by connecting it with a more reactive metal like Mg, Zn etc. whereas in galvanisation, the iron object is protected from corrosion by coating it with zinc.
What is the difference between sacrificial protection and Galvanising?
Galvanising is coating the iron with a layer of zinc in order to prevent it from rusting. However, sacrificial protection is attaching a piece of zinc to the iron object. Both methods use the same principle to work.
What type of protection is Galvanising?
Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting.
How is cathodic protection measured?
Connect a copper sulfate half-cell to your volt meter and make contact with the ground, while connecting your meter to underground metal. Afterwards, measure the pipe to soil voltage potential. Your readings should be 0.85 or higher. Measurements lower than 0.80 is indicative of corrosion.