1. Galvanized pipe cleaning
Use solvents and emulsions to clean the surface of steel to remove oil, grease, dust, lubricants and similar organic substances, but it cannot remove rust, oxide scale, welding flux, etc. on the surface of steel, so it is only used as an auxiliary method in anti-corrosion production.
2. Derusting of galvanized pipes
First, use tools such as wire brushes to polish the surface of the steel, which can remove loose or raised oxide scale, rust, welding slag, etc. Manual tool rust removal can reach Sa2 level, and power tool rust removal can reach Sa3 level. If the surface of the steel is adhered to a solid oxide scale, the tool rust removal effect is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be achieved.
3. Pickling of galvanized pipes
Generally, two methods of chemical and electrolysis are used for pickling treatment. For pipeline anti-corrosion, only chemical pickling is used, which can remove oxide scale, rust, and old coating. Sometimes it can be used as 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 cause pollution to the environment.
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