Roughness effects of coated steel pipe coating layer

Steel pipe surface treatment is a key factors to determine pipeline life, it is the ability to securely and steel pipe coating combined premise verified by research institutions, in addition to the life of the coating depends on the type of coating, coating quality and construction environment and other factors, steel pipe coating surface treatment on the life of about 50%, therefore, it should be strictly in accordance with the specification for the steel surface coating requirements, and continuously explore and summarize the continuous improvement of steel surface treatment method. Then the roughness on the coating produced a fundamental impact, that is, the size of adhesion, adhesion great use of time will naturally increase, life expectancy will increase, on the contrary, it will lead to the coating off easily reach the exposed steel antiseptic effect.



Roughness is too small and would constitute an impact resistant coating adhesion strength decreases. Theoretical proof, the choice of which can get rid of almost all the rust grade oxide scale, rust and other contaminants, anchor pattern depth reached 40 ~ 100μm, Satisfied with the pipe coating adhesion begged, and spray (throwing) shot except rust process can lower operating costs and the rest from the mass arrival can * almost white level (Sa2.5) Skills condition. The use of a solvent, emulsion clean steel surface, in order to arrive remove oil, grease, dust, lubricants and similar organic matter, but it can not remove the steel surface rust, oxide, flux, etc., so as the anti-corrosion coating to help the wrist only. Typically, the diameter of Shot 0.8 ~ 1.3mm, grit particle size of 0.4 ~ 1.0mm, during which the major component is 0.5 ~ 1.0mm.



For a metal anti-corrosion coating paint system performance reflected a suitable surface treatment is essential. Typically the metal surface will be accompanied by dust, grease, scale, rust layer, pollutants, salt or loose old paint. Oxide which is more common but the most easily overlooked part. High temperatures in the steel oxide generated during forging forming a dense oxide layer, usually attached to relatively strong, but more brittle than the steel itself, and the cathode itself, will accelerate the corrosion of metals. Anticorrosion pipe coating layer in addition to the life of the coating depends on type of coating quality and construction environment and other factors, the steel surface treatment on the coating life of about 50%, the coating solvent-free, no leaking substances, and thus will not contaminate the transmission medium, thus ensuring fluid purity and hygiene.

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