Comparison of various processes for anti-corrosion coating of steel pipes

Steel pipe anti-corrosion coating process 1: Due to the shower coating method, the coating film sags seriously. In addition, due to the unreasonable design of the roller table and chain, there were two longitudinal and multiple circular scratches on the coating film. This craft is being phased out. The only saving grace of this process is that it is heated and dried after coating.
Steel pipe anti-corrosion coating process 2: The coating film has quality defects such as sagging, whole-body spiral scratches, and whitening. What is particularly serious is that the thickness of the coating at the spiral scratched area is only one-fifth of the specified thickness, and the appearance is very poor. At the same time, this process has the potential for process fire caused by electrostatic ignition. Several fire accidents have occurred in recent years, posing a threat to production safety. The absence of a drying process is also an important flaw of this process. Since this process has many contradictions that are difficult to overcome and restrict each other, it is becoming increasingly outdated and cannot adapt to the requirements of modern factory-based automatic painting. It will gradually withdraw from the field of steel pipe coating.
Steel pipe anti-corrosion coating process 3: It is a technologically advanced but not very mature process. Spraying and curing are completed instantly between two rollers, and its advantages are self-evident. However, some weaknesses are difficult to overcome, such as the pre-treatment requirements for the surface of steel pipes are extremely strict, and if you are not careful, the adhesion will drop significantly; UV coatings and equipment are expensive and require high technical management; the coating is brittle, and if it is damaged during transmission, If bumped, it will easily fall off locally and be difficult to reapply. Due to the existence of so many problems, the promotion of this technology has been restricted.
Steel pipe anti-corrosion coating process 4: It is a technically advanced and relatively mature process that has been developed in recent years. It overcomes the shortcomings of other processes such as serious sagging, scratches, whitening, and fragility of the coating film. The coating film produced by it has strong adhesion, flexibility, good anti-rust effect, rarely sags, and is beautiful and complete. The process also has the characteristics of easy operation, complete supporting facilities, low technical management requirements, and safety.