It is mainly for steel pipes, which are prone to corrosion reactions, and there are certain hidden dangers to equipment damage after corrosion. After removing all kinds of oil, rust, oxide scale, welding spots and other dirt, the corrosion resistance of steel can be greatly improved.
If there is dirt on the surface of the stainless steel pipe, it should be cleaned by mechanical cleaning, then degreasing and degreasing. The presence of grease on the surface will affect the quality of pickling and passivation. Therefore, degreasing and degreasing cannot be omitted, and lye, emulsifier, organic solvent, and steam can be used. and so on.
Passivation is the last process step in chemical cleaning and a key step, and its purpose is to prevent corrosion of materials. For example, after the boiler is pickled, rinsed, and rinsed, the metal surface is very clean, very activated, and easily corroded. Therefore, passivation treatment must be performed immediately to form a protective film on the cleaned metal surface to slow down corrosion.