| Message: | Tpep anti-corrosion steel pipe use: anti-corrosion steel pipe base material including spiral pipe, straight seam pipe, seamless pipe, etc., widely used in petroleum, chemical, natural gas, heat, sewage treatment, water source, bridge, steel structure, marine water pumping, etc. Pipeline engineering field. Pipes (steel pipes) are used in different working environments to reduce or prevent the pipe from being eroded and deteriorated by chemical or chemical action of the external medium or by the metabolic activities of microorganisms. Apply 2 or 3 layers of polyethylene on the outer wall (tpep In order to achieve pipeline anti-corrosion, the service life of tpep anti-corrosion pipe is extended by 3-5 times. (1) Through the review of the application history of European polyethylene anti-corrosion layer for 30 years, although corrosion or stress corrosion cracking will occur under the anti-corrosion layer theoretically, there is no case of sub-film corrosion or stress cracking under the peeling anti-corrosion layer. . At the Mannesmann Institute in Germany, long-term corrosion laboratory experiments were carried out to simulate the application of anti-corrosion coatings. Corrosion test environment has soil, water, and test main stress corrosion cracking problems. The experimental anti-corrosion is to place the defective polyethylene anti-corrosion layer steel pipe under corrosive conditions and stress conditions. The corrosive environment is sand environment containing NaHCO3, temperature 70 °C. The tube ground potential is ~-460mV, the surface of the steel tube is pretreated in different ways, and all the steel tubes are pressurized. At the end of the experiment, there was more or less peeling around the defects of the anti-corrosion layer, but the peeling area was found to be corroded. The steel pipe with no oxygenated skin on the surface is subjected to stress cracking, and the steel pipe with oxide scale is cracked. The crack depth is 0.2 mm, which may be caused by stress c......url:http://www.acreemetal.com |
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