Corrosion-resistant materials and the basic requirements for material properties   

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(1) Good electrical insulation: The resistance between the two opposite sides of the anti-corrosion layer over a certain area should not be less than 10,000 Ω·m2； The breakdown voltage strength must not be lower than the voltage standard detected by the spark detector. (2) Resistance to cathodic stripping: The anti-corrosion coating should possess a certain capacity to resist cathodic stripping, ensuring effective adhesion between the coating and the substrate.  (3) Sufficient mechanical strength: It should have a certain impact resistance to prevent damage caused by handling and soil pressure ； It has good resistance to bending, ensuring that it will not be damaged when subjected to bending during pipeline installation ； It has good wear resistance to prevent damage caused by soil friction ； It has good adhesion to pipes.  (4) Good stability: excellent resistance to atmospheric aging ； Good chemical stability ； Good water resistance, low water absorption rate ； It has sufficient heat resistance ； It has excellent low-temperature resistance, ensuring that it does not crack or fall off during stacking, transportation, and construction.  (5) Easy repairability: The anti-corrosion coating should be easy to repair once it is damaged, thereby saving construction time. (6) Good antimicrobial properties.