The ductile iron pipe adopts the cement lining as the internal anti-corrosion form, and the zinc and asphalt form the external anti-corrosion form.
The ductile iron pipe adopts the cement lining as the internal anti-corrosion form, and the zinc addition of the bitumen as the external anti-corrosion form of the galvanized layer anticorrosion pipeline: the service period is 16 to 19 years, only two pipes, 0.5mm ~ 0.7mm cast iron pipe wall thickness is corroded. Zinc layer anticorrosion pipeline: 85% of the pipeline is corroded. Asphalt external anticorrosive pipeline quantity Asphalt zinc external anticorrosive pipeline quantity As of the end of 1974, the number of corroded pipelines 35 9 During the period from 1961 to 1974, the used pipeline length (km) The number of damaged pipelines per 1000km The number of 2.55 k9 ductile iron pipes Anti-corrosion function: The ductile iron pipe is generally made of zinc and asphalt as the external anti-corrosion form, and the anti-corrosion effect is also very good. Through the study found that the external anti-corrosion composition: zinc + asphalt paint has inseparable superior protective effect, in which the zinc layer plays a decisive role. A large number of test results and actual survey data of the project indicate the importance of the zinc layer. Zinc layer as an active protective layer, its protective function is mainly reflected in the following three aspects: 1. Electrochemical protection 2. Form a protective layer The self healing of the injury.
At present, ductile iron pipes adopt cement lining as the internal anti-corrosion form, zinc and asphalt as external anti-corrosion forms, and have been manufactured in the production process, and do not require anti-corrosion treatment after installation and installation. This has become a common practice for ductile iron pipe manufacturers at home and abroad, and the anti-corrosion effect is also very significant.
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