防腐方法（Antiseptic method）.docVIP

防腐方法（Antiseptic method） These factors will affect the corrosion current, the resistivity of the soil are main indicators for soil erosion, soil resistivity is small, the strength of the current form of corrosion cell increases, corrosion rate is greater, and vice versa. The outer wall of buried steel pipe anti-corrosion common insulating layer corrosion and electrical corrosion protection, they are often used at the same time. The insulation layer anti topography, geological conditions of corrosion pipeline according to the geographical position of the correct selection of corrosion resistant materials are reasonable, commonly used at home and abroad have petroleum asphalt, epoxy coal asphalt, coal tar enamel, polyethylene fusion bonded epoxy powder etc.. The total cost of pipeline anti corrosion should include the following factors: the material, construction, installation, repair, and the 5 6 7 cathodic protection, maintenance, inspection, the design period, the above factors, the use of more is to prevent corrosion of coal tar epoxy, can be selected according to different requirements. The following specific protection measures for pipeline corrosion measures Protective coating Anti corrosion coating as a protective method recognized has been widely used for corrosion control of buried pipeline. As the first line of coating corrosion control, its effect is the tube metal substrate and the corrosive environment of soil isolation, while providing the necessary conditions for the implementation of additional insulation for cathodic protection. In addition, in the operation of pipeline coating coating, loading and unloading, backfilling under and put into operation after the inevitable defects. Underseal Currently used for anti corrosion coating of buried pipeline are: the new composite coating and epoxy powder. Coal tar enamel and petroleum asphalt due to less pollution to the environment at present, for the old pipeline repair is mainly tape and liquid coating. com