Common Anti-corrosion Treatment Techniques
Coating Anti-corrosion
This is a relatively common method. Common coating materials include epoxy resin and polyethylene. Taking epoxy resin coating as an example, it can form a dense protective film on the surface of steel bellows, effectively isolating water, oxygen and corrosive media from contact with steel. Moreover, the epoxy resin coating has strong adhesion, can remain stable for a long time, and is not easy to fall off, providing reliable protection for the steel corrugated pipe.

Galvanizing Anti-corrosion: A layer of zinc is applied to the surface of the steel corrugated pipe by hot-dip galvanizing or electro-galvanizing. Zinc is more chemically active than iron. In a corrosive environment, zinc will corrode first, thus protecting the steel. The hot-dip galvanized zinc layer is thicker and has a better anti-corrosion effect. It is suitable for some occasions with high anti-corrosion requirements, such as underground drainage pipes.

Cathodic protection is an electrochemical protection method that applies an electric current to the steel bellows, making it the cathode and thus inhibiting the corrosion of the steel. The sacrificial anode method is usually used to connect metals that are more active than steel (such as magnesium, zinc, etc.) to the steel bellows. The active metal acts as the anode and continuously dissolves, protecting the steel bellows as the cathode.

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