Corrosion of steel pipes is inevitable, as the main use of steel pipe underground pipe thermal pipe corrosion is inevitable, so it is necessary to introduce the impact of its corrosion of the various Factors, in order to be treated with caution in future projects. Briefly, the causes of corrosion are the following. Temperature Effects: Temperature will increase the rate of corrosion. In general, in the atmospheric environment, the speed increased by 10 ℃, the corrosion rate doubled. Potential difference: two metals in the same medium environment, the higher potential of the metal will be corrosion, the lower potential of the metal is protected. Heat treatment: Heat treatment will alter the corrosion behavior of the metal. Surface state: surface cleanliness, with or without the surface membrane and the surface with or without other substances, the incidence of corrosion and the development of a great impact. Impurities: Impurities are an extremely important factor in corrosion. Radiation: Radiation can accelerate corrosion. Effect of abrasion: Even very light abrasion can damage the protective film formed on the surface of the substrate by corrosion, and the exposed fresh metal is subject to corrosion, thus accelerating the damage. Stress: usually under the action of tensile stress in the metal under the action of stress in the corrosion occurred earlier, the speed is faster. At the same time, the stress of the material under stress than the material to be faster corrosion, especially when the applied load close to or exceed the yield limit, especially. Time: As the time lengthens, the degree of corrosion increases. The rate of corrosion increases with time, under different conditions, or increases or decreases. Pressure: the pressure of the chemical reaction of the material oxidation, must also be considered factors. Other factors: process, process conditions, oxygen, concentration, the surrounding environment, biological factors such as corrosion will have an impact.
