Anti-corrosion technology for seamless steel pipes is essential to protect pipes from corrosion and extend their service life, especially when they are exposed to corrosive environments. Some common anti-corrosion techniques are used in seamless steel pipes.
Coating systems:
Inner coating: When pipes carry corrosive liquids, the use of inner coatings can prevent corrosion and protect the transported material.
Outer coating: Outer coatings protect the outer surface of the pipe against corrosion caused by the environment. Common exterior coatings include:
Fusion-Bonded Epoxy (FBE): applied as a dry powder to the heated pipe surface, forming a protective layer.
3-layer polyethylene (3LPE) or polypropylene (3LPP): consists of a fused epoxy layer, an adhesive layer and a polyethylene or polypropylene layer.
Cathodic protection:
Galvanic Cathodic Protection: Involves attaching protective anodes (usually zinc or magnesium) to a steel tube. These anodes corrode instead of steel, providing protection.
Impressed Current Cathodic Protection: Uses an external power source to deliver an electric current to the steel, preventing corrosion.
Corrosion inhibitors:
Chemical inhibitors: To reduce the corrosion effect of steel, corrosion inhibitors can be added to the liquid transported in the pipe.
Packing tapes:
Bitumen-based tapes: applied as a tape to the outer surface of the pipe, forming an anti-corrosion protective layer.
Thermal spraying:
Metal Coatings: Application of a metal coating (eg zinc or aluminum) to the pipe surface using thermal spraying methods. Cement mortar coating:
Coating pipes with a layer of cement mortar to protect against corrosion in water and sewage applications.
When choosing a corrosion protection technology for seamless steel pipes, one must consider, for example, the environment, the type of fluid to be transported, the temperature and the expected service life. It is common to use a combination of these techniques for comprehensive corrosion protection. In addition, compliance with industry standards and proper quality control in the use of anti-corrosion measures are critical to their effectiveness.
Post time: Nov-03-2023