The role of pickling and passivation of precision steel pipes in the process of prefabrication, welding, testing, and heat treatment will cause iron oxide, welding slag, grease, and other dirt to accumulate on the surface of the pipes (carbon steel pipes, carbon copper pipes, stainless steel pipes), making the pipes Changes in corrosion resistance.
Pickling is a chemical de-rusting method: acid dilute de-rusting is mainly to remove metal oxides on the surface of stainless steel pipes for oxygen. For ferrous metals, it mainly refers to iron oxide, which is to make these metal oxides chemically react with acid solution and dissolve in acid solution, to achieve the purpose of rust removal.
Before pickling and derusting, the grease on the pipe wall of the stainless steel pipe should be removed first, because the presence of grease prevents the pickling solution from touching the pipe wall. Affects the rust removal effect. For oil-free pipelines (such as stainless steel pipelines for oxygen), degreasing must be carried out first. Pickling refers to the use of pickling solutions such as sulfuric acid to wash off the oxide layer and dust on the workpiece. The role of cleaning the surface Phosphating is a treatment method.
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