PE (polyethylene) anti-corrosion tape typically consists of three layers: a polyethylene substrate, an adhesive layer, and an anti-stick release layer. The substrate is made of high-density polyethylene or medium-density polyethylene.
Polyethylene has a molecular structure of -(CH2-CH2)n-, exhibiting high chemical inertness. Its molecular chain contains no polar groups, and its carbon-hydrogen bond energy is as high as 414 kJ/mol.
Its chemical corrosion resistance is mainly based on mechanisms such as physical barrier effects, chemical inertness, crystallization protection, and interfacial impedance.
In different chemical media, after immersion in a 10% sulfuric acid solution for 30 days, the tensile strength retention rate is greater than 95%; after immersion in a 20% hydrochloric acid environment for 60 days, the mass change rate is less than 0.5%; after immersion in a 10% sodium hydroxide solution for 90 days, there is no change in appearance and the mechanical property retention rate is greater than 98%; after immersion in a 3.5% sodium chloride solution for 1 year, there is no significant change in performance; it exhibits excellent performance against alcohols and ketones, but is sensitive to aromatic hydrocarbons and chlorinated hydrocarbons, which may cause swelling.
Compared with other anti-corrosion materials (such as epoxy coal tar coating, polypropylene tape, PVC tape, and FBE coating), polyethylene tape exhibits different performance in terms of resistance to soil microbial corrosion, low-temperature performance, stress cracking resistance, range of chemical media resistance, and resistance to mechanical damage.
