What are the anti-corrosion coatings of ductile iron pipes?

Nodular cast iron pipe Nodular graphite cast iron is obtained by spheroidization and inoculation treatment to obtain nodular graphite, which effectively improves the density and mechanical properties of the cast iron material, especially the plasticity and toughness, thereby obtaining higher strength than carbon steel. Nodular cast iron is a high-strength cast iron material. Its comprehensive properties are close to steel. It is based on the excellent properties that it has been successfully used to cast some parts with complex forces and high requirements for strength, toughness, and wear resistance. Nodular cast iron has rapidly developed into a widely used cast iron material.

Zinc layer: anti-corrosion treatment of the bottom layer of the outer surface of the pipe fittings-zinc spray

Asphalt paint anti-corrosion layer: spray anti-corrosion paint on the outer surface of cast iron pipe fittings with zinc-sprayed anti-corrosion treatment

Internal anticorrosion: high-pressure cement mortar lining on the inner surface of pipe fittings, using water-washed sand and high-sulfur cement as raw materials