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　　For the cleaning of hollow sections, solvent and emulsion are used to clean the surface of wear-resistant pipe, wear-resistant ceramic pipe, ceramic pipe and ceramic composite pipe, so as to remove oil, grease, dust, lubricant and similar organics, but it can not remove rust, oxide skin and welding flux on the steel surface, so it is only used as an auxiliary means in anti-corrosion production.

　　Tool derusting of hollow sections: steel wire brush and other tools are mainly used to polish the steel surface to remove loose or warped oxide scale, rust, welding slag, etc. The derusting of manual tools can reach grade SA2 and that of power tools can reach grade SA3. If the steel surface is firmly attached with iron oxide scale, the derusting effect of tools is not ideal and can not reach the anchor depth required for anti-corrosion construction

　　Pickling of hollow sections: generally, chemical and electrolytic methods are used for pickling treatment. Chemical pickling is only used for anti-corrosion of wear-resistant pipe, wear-resistant ceramic pipe, ceramic pipe and ceramic composite pipe, which can remove oxide scale, rust and old coating. Sometimes it can be used as reprocessing after sand blasting. Although chemical cleaning can make the surface reach a certain cleanliness and roughness, its anchor lines are shallow and easy to pollute the environment.

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