The Corrosion Prevention through Plastic Coating on Steels

Corrosion of pipelines coatings is one of the main problems in oil and gas industries for which a large amount of money is spent each year. Coating is the first defense line in front of a corrosive environment in which pipes have been buried. Good function of a coating depends on its adhesiveness rate to the metal surface. Initial adhesiveness and its durability in the contact conditions are same among those factors that enhance coating efficiency in a long term. The rate of initial adhesiveness has a high relationship with coating movement and surface wetness by this movement in the course of applying the coating and also with the cleanliness and preparedness of pipe surface. The durability and permanence of adhesiveness depends on coating properties including its resistance in front of moisture penetration. Applying coating on the pipelines has high cost so for this reason the selection and application of coating of high importance. Also for underground buried pipe it is not possible to change their coating in short duration unlike other structures. Therefore the coating must ben durable for 20 years. This process to investigate the reason for corrosion in steel pipes with three polythene layers.