Anti-corrosion Method of Coating Steel Pipe

Anti-corrosion coating steel pipe anti-corrosion methods are generally used anti-corrosion coating, under the following we to understand the knowledge about corrosion coating.

Anti-corrosion coating is uniform and dense coating to the metal coating in the pipe by rust on the surface, to cut off with a variety of corrosive media, is one of the most basic way steel corrosion. Steel pipe anti-corrosion coating increasingly using composite materials or composite structural steel pipe. These materials and structures should have good dielectric properties, physical properties, chemical properties and stability of a wide temperature range and so on.

1, the outer anti-corrosion coating: coating the outer wall of pipe types and conditions of use.
Wall corrosion coating: In order to prevent pipe corrosion, reduce friction, increase the amount of input applied to the tube wall and membrane. Coatings are commonly used in epoxy resin and polyamide curing epoxy amine coating thickness of 0.038 to 0.2 mm. In order to ensure a strong bond coating and the wall, the inner wall surface must be handled. Since the 1970s tend to pipe, coating the outer wall of the same material used for the tube, the outer wall of the coating at the same time.
Corrosion insulation coating: in the small diameter of the heat output of crude oil or fuel oil pipeline, in order to reduce the heat to the soil carbon steel pipe, the pipe insulation and corrosion with external composite layer. Commonly used insulation material is rigid polyurethane foam, for a temperature of -185 ~ 95 ℃. Soft texture of this material, in order to improve their strength, increase in the deposited layer of insulation outside the high-density polyethylene layer, to form a composite material structure, in order to prevent infiltration of groundwater into insulation layer.

2, such as the outer protection tube is polyethylene pipe, do not need anti-corrosion
Polyethylene odorless, non-toxic, wax-like feel, with excellent low temperature performance (the lowest temperature up to -70 ~ -100 ℃), good chemical stability, the ability of most of the acid-base erosion (oxidative nature of intolerance acid), not soluble in common solvents at room temperature, water absorption, but because of its slow as a linear molecule can be soluble in some organic solvents, and does not swell, excellent electrical insulation properties.

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