Cathodic protection is a renowned and effective technique that is used to prevent the corrosion and deterioration of metals; it is used to protect industrial equipment and structures such as steel, water pipelines, storage tanks, oil platforms and ships. Corrosion occurs in structures that are located underground and are exposed to the soil as well as in equipment that is located underwater. If it is not addressed timeously, corrosion can have harmful effects on metal structures.
Corrosion is a gradual process that breaks down the properties of metals; this deterioration is a byproduct of a chemical reaction that occurs between metals and their environment. Corrosion is a result of the redox reaction of iron and oxygen in an environment that has water or moist air.
How does Cathodic Protection work?
Corrosion is mitigated by two options. primarily coatings can be utilised but coating are only effected for a specified lifespan. CP is a secondary form of defence and can be utilised throughout the lifespan of the asset. Coatings cannot necessarily or effectively be replaced or maintained on all structures. however, the CP is adaptable and can be adjusted through the asset life to suit the changing environment and corrosion conditions.
The harmful process of corrosion can be effectively prevented and managed through cathodic protection. The cathodic protection process involves the conversion of anodic sites on the metal surface into cathodic sites; this process is known as a cathodic electrochemical reaction. In the cathodic Protection process, direct current is used to counteract the corrosive chemical reaction (anodic reaction) that destroys metal surfaces. It must be noted, however, that while cathodic protection prevents metal deterioration and corrosion, it does not restore the damaged metal surface.
Cathodic protection can be used on various types of metal structures in various environments. It is one of the few methods of corrosion control that can competently protect a submerged metal surface. In order for the cathodic protection process to be effective, you have to ensure that you design and acquire reliable cathodic protection current from your system.
Cathtect Engineering offers the following:
- Cathodic protection rectifiers & electrical systems
- Cathodic protection de-coupling & isolation
- Cathodic protection anodes
- Reference Electrodes and Coupons
- Cathodic Protection monitors and control systems
- Cables and cable accessories
- Eathing and Weld materials
- Selective Backfill materials
- Concrete Enclosures
South Africa has been applying the cathodic protection technique on most railways and pipelines for the past 50 years. Cathtect Engineering prides itself on being an industry leader in cathodic protection and corrosion mitigation. We are a solutions-based company that offers high-quality products and professional services.
If you are looking for expert advice regarding cathodic protection, contact us today.