The invention discloses a TPEP hot-melting 3PE anti-
corrosion steel
pipe and a preparation process thereof.The TPEP hot melting 3PE anti-
corrosion steel
pipe comprises a steel
pipe body, an inner layer, a bottom layer, a middle layer and an outer layer, and the inner layer is coated inside the steel pipe body. According to the steel pipe, the sintered
epoxy powder is adopted as the bottom layer, chemical bonding with the middle layer is facilitated, such that the
corrosion resistance and cathodic disbonding resistance of the steel pipe are improved, and meanwhile, the middle layer is a
copolymer adhesive, plays a role in bonding the bottom layer and the outer layer and is beneficial to resisting a
shear force caused by
soil movement and temperature change, and at the same time, the outer layer is arranged, so that the steel pipe has excellent
moisture resistance, the bottom layer and the middle layer are convenient to protect, the
coating process can be completed through the same process, such that the cost for
purchasing needed production equipment is reduced, and the needed
energy consumption is reduced; meanwhile, the quality of the steel pipe is improved, the steel pipe is wrapped with antirust paper, then
moisture in the environment for storing the steel pipe is reduced, such that a phenomenon of secondary rusting of the steel pipe is avoided, and thus, the working efficiency is further improved.