3pp corrosion pipe coating structure: a first layer of epoxy powder (FBE50 ~ 100um), a second layer of adhesive (AD) 250 ~ 400um, a third layer of polypropylene (PP) 1.4 ~ 4.0mm. Three materials blend to form a solid combination with fine steel coating, the coating temperature up to 110 degrees. For the three processes of electrochemical corrosion of buried pipelines, corrosion of steel corrosion inhibition method from which a process to start. Therefore, anti-corrosion coating and cathodic protection is a combination of methods to rid this table, economical and effective. Since the destruction of the output current process, magnesium alloy anode design life best match the useful life of the pipeline, neither extravagant too soon produce increased maintenance costs. Different methods have different antiseptic antiseptic quality and costs, should be protected in accordance with anti-corrosion steel pipe different pressures, different environments and different purposes and in which different gas transport, a comprehensive account of corrosion and corrosion expense method. Implementation of the standards: DIN30678 "polypropylene coating technology standard pipe and fittings."