Soil corrosion: Soil corrosion is the corrosion of metals in the soil. The soil is a special solid electrolyte with capillary porosity. The cathodic process of soil corrosion is mainly oxygen depolarization. Because oxygen passes through the solid microporous electrolyte to the cathode, the process is more complicated and slower, and the structure and humidity of the soil have a great influence on the flow of oxygen. . With the gradual deepening of the country's modern construction, the construction of underground metal has increased rapidly, such as the gas pipeline of the West-East Gas Pipeline, the oil pipeline of the North Oil South, the cable, and the underground pipe discharge pipe. Because of the corrosion of the soil, causing oil, gas, and water to leak, causing losses or accidents, it is important to study soil corrosion. Soil corrosion refers to the corrosion of materials by different components and properties of the soil. The soil is the corrosion property of the material and becomes soil corrosive. It is well known that the metabolic products of soil microorganisms can also corrode materials. Controlling factor 1, cathode process control 2, anode process control 3, resistance control Corrosion rate: Corrosion rate The weight loss of a metal material per unit area per unit time, or the concentration of the average loss of metal material loss per unit time. Unit: mm/a Calculation formula for corrosion rate: Where m1 is the quality of the carbon steel coupon after pre-treatment drying; M0 is the quality of carbon steel coupons after being dried by acid, alkali and alcohol after the test; △m is the quality loss of pickled blank carbon steel coupons; S is the surface area of ​​the carbon steel coupon; T is the test time; D is the density of carbon steel coupons.
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