Al Jawf Al Sahra Al Dawlia for Oil & Gas Services and Petrochemical
Cathodic Protection Services
We are the leading supplier of Cathodic Protection Services in Libya
What Is Cathodic Protection and How Does It Work?
Corrosion is a natural process that can deteriorate metal structures and cause costly damage for your business.
For corrosion to occur, four elements must be present:
- Host site from which current flows
- Destination site where no current flows,
- Medium capable of conducting current (such as water, concrete, or soil)
- Metal path between the host and destination site.
Electrochemical corrosion of metals is the process by which ions on the surface of a metal are transferred to another substance (a depolarizer, or less active substance or metal). Such depolarizers are oxygen, acids, or cations of more passive metals.
What Is Cathodic Protection Used For?
Cathodic protection is often used to mitigate corrosion damage to active metal surfaces.
Cathodic protection is used all over the globe to protect pipelines, water treatment plants, above and underwater storage tanks, ship and boat hulls, offshore production platforms, reinforcement bars in concrete structures and piers, and more.
Cathodic protection is often used to protect steel from corrosion. Corrosion is caused when two dissimilar metals are submerged in an electrolytic substance such as water, soil, or concrete. This type of metal conducting path between the two dissimilar metals allows a pathway through which free electrons move from the more active metal (anode) to the less active metal (cathode). If free electrons from the anode do not reach active sites on the cathode before the arrival of oxygen, ions at the active sites can then recombine to produce ferrous hydroxide, i.e. rust
How Does Cathodic Protection Work?
In essence, cathodic protection connects the base metal at risk (steel) to a sacrificial metal that corrodes in lieu of the base metal. The technique of providing cathodic protection to steel preserves the metal by providing a highly active metal that can act as an anode and provide free electrons. By introducing these free electrons, the active metal sacrifices its ions and keeps the less active steel from corroding.
Types of Cathodic Protection
There are two basic types of cathodic protection: Galvanic protection and Impressed Current Cathodic protection.
Galvanic Protection
Galvanic protection consists of applying a protective zinc coating to the steel to prevent rusting. The zinc corrodes in place of the encapsulated steel. These systems have limited life spans, as the sacrificial anode protecting the underlying metal will continue to degrade over time until the sacrificial anode is no longer capable of supplying protection.
Impressed Current Cathodic Protection