What is Corrosion?

Corrosion refers to the process of loss and destruction (including metals and non-metals) under the action of surrounding media (water, air, acid, alkali, salt, solvent, etc.).

Metal corrosion refers to the chemical or

The factors that affect the corrosion of metal products are: atmospheric humidity, temperature, oxygen, and pollutants in the atmosphere; the material properties of the metal itself, and the surface state of the metal also affect its corrosion. ^[3]

The corrosion potential is the potential measured when the metal reaches a stable corrosion state when no applied current is applied. It is a mixed potential of the anode reaction and the cathode reaction polarized by the self-corrosion current. Dissolution and reduction of depolarizing agents. ^[5]

That is, the potential generated when a metal does not pass a current in a medium is called a corrosion potential, also called a natural potential or a self-corrosion potential or a natural corrosion potential or a self-corrosion potential. Both the nature of the metal structure and the soil quality can directly affect the corrosion potential, but this effect is not significant. When the corrosion potential changes and the potential increases, the presence of stray currents in the soil layer should be considered.
In the narrow sense, the corrosion potential refers to the phenomenon that the physical-chemical interaction between the metal and the environment changes the properties of the metal, resulting in damage to the functions of the metal, the environment, and its constituent systems.