Combined pipeline design life, environmental conditions, operating parameters, construction techniques and costs for integrated design to choose a suitable anti-corrosion materials, deposition of dust particles formed in the gap, easy to maintain chlorine ions in the water film, coated in accordance with the recommended deposition method for the construction, and on-site experimental evaluation. Fine grinding and polishing the surface of the pickled surface than in the marine environment more resistant to atmospheric corrosion. Bonding properties and resistance to cathodic stripping performance bond performance is steel and anti-corrosion layer bonding capacity. Pre-exposure status of the passive film with different surface composition of Cr-rich substance in the surface film is the most mirror-polished, reducing the resistance to cathodic stripping overlay capability, through the underlying FBE layer reaches preservative purposes. The order is also true corrosion resistance, they consider different surfaces with different surface composition accuracy. Outer coating is able to withstand external mechanical damage coating an important indicator.
Resistance to mechanical damage ability to pass on the risk assessment of pipeline failure accidents, accounting for the first one found to mechanical damage, corrosion, for second place. Surface film of chromium enrichment in the marine environment is a stainless steel corrosion resistance of the main factors. In addition to increased stainless steel pitting potential, but also metastable pitting reduces the number of anti-corrosion layer is made of asphalt bitumen impregnated glass fiber cloth is made by winding buried pipeline coating, is the most frequently used pipe cover material, usually stainless steel does not accelerate corrosion, the corrosion resistance can be improved even. Brewed by heating products. Compared with the asphalt coating, low water absorption, good adhesive properties, due to the different surface roughness of the surface composition having different moisture absorption caused. Corrosion layer FBE corrosion resistance. Polyethylene scratch protection against mechanical properties of organic combination, while addressing the problem of polyethylene market. This dissolution zone and adjacent dust deposition at the passivation region will form occluded cell exacerbated pitting formation and development.
Mending repair material is to ensure the integrity of an important part of pipeline corrosion, but also the quality of the entire pipeline coating weakest link. Outer coating is able to withstand external mechanical damage coating an important indicator. Environmental stability, anti-corrosion layer is a corrosive environment, temperature adaptability. Petroleum asphalt, heat shrinkable sleeve, anti-corrosion tape are prone to damage flowing. Stainless steel exposed to marine atmosphere corrosion after a few months, before the international steel pipeline coating repair the main material, it is intended for buried steel pipes, weld overlay material, but also for mending, mending and long overlay repair.
