At present, the 3PP anti-corrosion pipes processed in our country generally adopt the German DIN30678 standard “Polypropylene Coating for Steel Pipes”. The 3PP coating is mainly used as an anti-corrosion layer for pipelines transporting media at higher temperatures and for pipelines in desert areas with higher ground temperatures and longer exposure to sunlight. Therefore, it has been increasingly widely applied to buried water, gas and oil pipelines in regions with higher ground temperatures and longer exposure to sunlight.