Pipeline corrosion is a pervasive issue, necessitating the adoption of anti-corrosion measures to avoid or mitigate its occurrence. Typically, the primary methods for preventing corrosion in steel pipes involve applying anti-corrosive agents, uniformly and densely coating the rust-removed metal surface with paint, or applying a similar coating to the interior walls of the pipes. However, even though some steel pipes have undergone anti-corrosion treatment, this does not guarantee a long service life. So, what factors influence the service life of anti-corrosion steel pipes? Which factor is crucial? How can we address this issue?
To prolong the service life of anti-corrosion steel pipes, the choice of anti-corrosion methods plays a significant role. Consequently, it is imperative to employ high-quality anti-corrosion materials and methods. Specifically, this involves two key points:
(1) To extend the service life of anti-corrosion steel pipes, the selection of anti-corrosion materials is crucial.
The primary material used in anti-corrosion coatings is coal tar enamel paint, which offers better protection for pipelines. Nevertheless, these materials have numerous drawbacks that limit their application range. Fortunately, with the development of society, the emergence of epoxy resin anti-corrosion fusion powder coatings has propelled rapid advancements in pipeline protection technology.
The primary advantages of epoxy resin anti-corrosion fusion powder coatings lie in their excellent corrosion resistance, mechanical properties, and strong resistance to cathodic disbondment. Combining single-layer, double-layer, and triple-layer heavy-duty epoxy powder coatings in an anti-corrosion structure maximizes the protection of steel pipe piles, mitigates corrosion, and effectively produces anti-corrosion pipes and lined pipes. Proven effective, this method is accurate, scientific, and suitable for anti-corrosion treatment of underground or submarine pipelines.
(2) Proper anti-corrosion treatment is essential for extending the service life of anti-corrosion steel pipes.
When performing anti-corrosion treatment on steel pipes, the following points should be noted:
Surface pretreatment involves spraying the metal surfaces of the internal and external walls of pressure steel pipes to remove rust, and the work should be carried out in a relatively sealed indoor environment. For large-scale rust removal, rust removers or machinery can be used. Mechanical rust removal through sandblasting and other methods enhances labor efficiency and reduces pollution to humans and the air. When higher anti-corrosion quality is required or the internal and external walls of the pipe are already rusted, chemical rust removers can be used to effectively remove oxides from the pipe's inner and outer surfaces.
After passing the quality inspection for the pretreatment of the inner wall of the steel pipe, painting should be done promptly. Painting should strictly follow the instructions provided by the paint manufacturer. The coating should be completed within 4 hours in sunny or moderately humid conditions, and spray painting should be finished within 8 hours.
