Pipeline anticorrosion method & # 8212; Anticorrosion coating
pipeline anticorrosion tape to a pipeline anticorrosion methods are commonly used anticorrosion coating. What is the anticorrosion coating?
with compact coating evenly coated on the surface of the metal pipe that the rust removal, separate it from all kinds of corrosive medium, is one of the most basic method of pipeline corrosion. Since the 70 s, in harsh environments, such as polar, ocean laying pipeline, as well as the transport and make the oil heating temperature and so on, puts forward more requirements on coating performance. Therefore, the pipeline anticorrosion coating composite material or composite structures are used more and more. The material and structure has good dielectric properties, physical properties, stable chemical properties and wide temperature range, etc.
1。 The outer wall corrosion protection coating: the outer wall of pipeline coating material types and conditions of use.
2。 The lining anticorrosion coating: in order to prevent corrosion, to reduce the friction resistance, improve the throughput and film coated on the pipe wall. Commonly used coating has amine cured epoxy resin and epoxy resin, polyamide film thickness is 0. 038-0. 2 mm. In order to ensure the coating with strong wall binding, must be carried out on the tube wall surface treatment. Tend to tube since the 70 s, the outer wall coating selection of the same material, so that the tube, the outer wall coating simultaneously.
3。 Anti-corrosion insulation coating: in the medium and small thermal oil or fuel oil pipeline, in order to reduce the pipeline to soil heat dissipation, on the outside of the pipe with thermal insulation and anti-corrosion composite layer. The commonly used thermal insulation material is a rigid polyurethane foam plastics, applicable temperature is - 185 ~ 95 ℃. The material quality of a material soft, in order to improve its strength, outside the insulating layer and apply a layer of high density polyethylene layer, form a composite material structure, in order to prevent the groundwater infiltration in the thermal insulation layer.