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Requirements for Anti-corrosion Coatings on Coated Steel Pipe
Common Anti-corrosion Techniques for Coated Steel Pipe
Anti-corrosion steel pipes undergo specialized treatment to effectively prevent or slow down chemical or electrochemical reactions during transportation and use, which can lead to corrosion.
One widely used type is the 3PE ordinary grade anti-corrosion steel pipe, which features a three-layer structure of polyolefin coating (MAPEC).
Three-layer PE Anti-corrosion Structure:
First layer: Epoxy powder (FBE > 100μm)
Second layer: Adhesive (AD) 170-250μm
Third layer: Polyethylene (PE) 2.5-3.7mm
Other anti-corrosion methods include IPN8710, FBE epoxy powder, and epoxy coal tar pitch.
Advantages of Using Anti-corrosion Steel Pipes
The coatings used for anti-corrosion steel pipes must meet the following criteria:
Excellent Corrosion Resistance:
The coating should remain stable when in contact with various corrosive media such as acids, alkalis, salts, industrial sewage, and chemical atmospheres.
It should not dissolve, swell, or decompose in these media, nor react chemically to form harmful substances.
Good Impermeability:
The coating should effectively prevent the penetration of liquids or gases with strong permeability, thus protecting the pipe surface from corrosion.
High Adhesion and Flexibility:
The coating must adhere well and remain intact despite vibrations or minor deformations of the pipe.
It should possess sufficient mechanical strength to prevent peeling.