Cathodic protection is to change the potential of a corroded metal (acting as an anode) to force it to act as a cathode. An insoluble line is connected to the direct current circuit so that a structure to be protected by the anode forms the negative pole of the circuit. This type of protection is called “external current-induced cathodic protection. At Cathodic protection method is a kind of metal protection method. As is known, most metal materials are subject to corrosion and corrosion if they come into contact with air and water. This poses great hazards, especially for metal materials that are under the ground or in water. There are several methods of protection to avoid corrosion of these materials. One of them is cathodic protection method. In this method, in order to prevent corrosion, a more active metal is placed next to the metal materials in contact with them. This method is called galvanic method cathodic protection. Cathodic protection method is applied in many areas. Oil drilling rigs are the most applied areas. In the meantime, cathodic protection is applied to prevent corrosion of the surfaces of the ships.
Since the structure to be protected constitutes the negative pole of the electric circuit, there is a continuous supply of electrons from the direct current source there. This is a continuous electron output (M Û M+2 + 2e- ) causes the corrosion of the metal in question to stop. Because the electrons released during dissolution and flowing to the cathode of the corrosion cell will be fed back by the direct current source. Another form of cathodic protection is to create an artificial battery circuit by using a more active metal than the metal to be protected as an anode, and by providing electron transfer to the structure to be protected against corrosion by the corrosion of the active metal. to protect it by turning it into cathode. This type of protection is called "Galvanic anode cathodic protection". The purpose of cathodic protection is to protect the metal from all types of corrosion by negatively polarizing the metal below a fixed potential threshold for each metal in a given environment.
As a result, current flows continuously to the unit area at each point of the line. The intensity of this current depends on the insulation resistance of the coating and the potential difference in that area. Therefore, the criterion chosen for protection is the minimum potential that the metal will bond with the earth. Measurements are usually made with reference to the copper / copper sulfate electrode. Under these conditions, a potential of N850mV or less must be reached at each point of the steel pipe in contact with the soil. Essentially, the basic principle of this method is to convert the metal material to be protected into a cathode of an electrochemical cell and to stop the anodic reactions running on the metal surface. The cathodic protection method, which was first applied in 1930 years, has shown great improvements in the following years. With the development of new high-performance anodes with technological advances, cathodic protection has become the most effective and economical method in the fight against corrosion.
Today, metals and metal alloys are used in many areas of the industry and use great energy to produce them. The most important factor that extends the life of metals and alloys is to protect against corrosion. Corrosion is the degradation of metal materials by the environmental effect, the loss of their metallic properties and their use. This situation is also very important for the country's economy. Because of corrosion, almost one quarter of the annual steel production is wasted every year. The main environmental factors that cause corrosion are weather, rainwater and sea water. Corrosion of iron is popularly known as rusting, and this is the most dangerous dimension of corrosion of metals. The use of steel and iron is very common in many places because of the easy production and low cost. However, any damage will occur at any point, the corrosion rate increases in a short time. Our company performs cathodic protection measurements in accordance with the relevant legal regulations, standards and test methods published by domestic and foreign organizations within the framework of electrical safety inspections.
