Pickling and passivation is a processing technology for stainless steel heat exchange tubes. Steel pipes are generally pickled and passivated during the production process. Why?
First of all, we need to know that the purpose of pickling is to remove dirt and rust on the surface of stainless steel heat exchange tubes. After pickling, a dense oxide film will be formed on the surface of the stainless steel heat exchange tubes, which makes the stainless steel heat exchange tubes Rust and corrosion will not occur in general media.
Passivation is usually performed together with pickling, so it is often called pickling passivation. If there is no passivation film formed on the surface of the stainless steel heat exchange tube after pickling, or the film formed is relatively thin, passivation treatment is required to form a perfect passivation film on the surface of the stainless steel heat exchange tube.