1. Before rust removal of cold drawn steel pipes, various visible dirt on the surface should be removed first, and then solvent or cleaning agent should be used to remove oil.
2. Use a tungsten steel shovel to remove large areas of rust.
3. Use a scraper and wire brush to remove rust from the edges and corners of the steel pipe.
4. Use a file to remove protrusions such as welding slag and various burrs from steel pipes.
5. Cold drawn steel pipes shall be cleaned with sandcloth and steel wire brush.
(1) Steel pipe carbon steel pollution: scratches caused by contact with carbon steel parts form Primary battery with corrosion medium, resulting in electrochemical corrosion.
(2) Cutting of cold drawn steel pipe: the attachment of rust prone substances such as cutting slag and spatter and the formation of Primary battery with corrosive medium will cause electrochemical corrosion.
(3) Baking correction: the composition and metallographic structure of the flame heating area change unevenly, forming Primary battery with the corrosion medium, resulting in electrochemical corrosion.
(4) Steel pipe welding: the physical defects (undercut, pore, crack, incomplete fusion, incomplete penetration, etc.) and chemical defects (coarse grain, poor chromium at grain boundary, segregation, etc.) in the welding area form Primary battery with the corrosion medium to produce electrochemical corrosion.
(5) Material: chemical defects (uneven composition, S, P impurities, etc.) and surface physical defects (looseness, sand holes, cracks, etc.) of the steel pipe are conducive to forming Primary battery with the corrosion medium and generating electrochemical corrosion.
(6) Passivation: Poor acid pickling passivation results in uneven or thin passivation film on the surface of cold drawn steel pipes, which is prone to electrochemical corrosion.
In summary, this is a summary of the relevant knowledge about the decontamination and chemical treatment of cold drawn steel pipes. I believe everyone has further learning and understanding. If you still want to learn more knowledge, please continue to follow us.
Post time: Jul-06-2023