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there are different opinions on the cleaning methods of plastic coated steel pipes. the following summarizes some of the cleaning methods for plastic-coated steel pipes.
(1) rust removal by spraying (throwing) shooting: rust removal by spraying (throwing) shooting is driven by a high-power motor to rotate the spraying (throwing) shooting blades at high speed, so that abrasive materials such as steel sand, steel shots, iron wire segments, minerals, etc. spraying (throwing) the surface of the steel pipe can not only completely remove rust, oxides, and dirt, but also achieve the required uniform roughness under the action of strong abrasive impact and friction.
(2) tool rust removal: mainly use wire brushes and other tools to polish the steel surface, which can remove loose or raised scales, rust, welding slag, etc. hand tool de-rusting can reach the sa2 level, and power tool de-rusting can reach the sa3 level. if the steel surface is attached with a strong oxide scale, the de-rusting effect of the tool is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be reached.
(3) pickling: generally, chemical and electrolytic methods are used for pickling treatment. only chemical pickling is used for pipeline anticorrosion, which can remove scale, rust, and old coatings. sometimes it can be used for reprocessing after sandblasting and rust removal. although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to pollute the environment.
(4) cleaning: use solvents and emulsions to clean the steel surface to remove oil, grease, dust, lubricants, and similar organic matter, but it cannot remove rust, scale, solder, etc. it is only used as an auxiliary means during production.