What surface treatments can be done on stainless steel pipes?

Produce stainless steel pipes, which are superior to ordinary stainless steel pipes in size, performance and even appearance. The same goes for surface treatment. What surface treatments can be done on stainless steel pipes?
1: Remove oxide scale
Oxide scale is a layer of black hard matter that appears on the surface of stainless steel pipes after welding or high-temperature treatment during the forming process. Precision stainless steel pipes will treat surface oxide scale. The general treatment methods include mechanical polishing or pickling and passivation.
Mechanical polishing deals with surface oxidation problems based on physical properties. It is simple and quick, but it may affect the accuracy of the tube body.

Pickling and passivation uses chemical properties to deal with surface oxidation problems and does not have much impact on the precision of stainless steel pipes. It can not only solve the oxidation problem, but also remove other stains and scars on the surface. It is a more classic surface oxidation treatment method.

2: Polishing treatment
The materials usually used for stainless steel pipes are generally 304 and 316L high-quality raw materials, and the surface of the raw materials has a brightness of 600 mesh.
As people's requirements for the surface of stainless steel pipes increase, surface polishing is divided into various degrees of brightness, such as bright gloss and mirror gloss. We can use mechanical polishing, chemical polishing, electrochemical polishing and other methods according to customer requirements to achieve the required gloss level for various surfaces.
In addition, in order to have a better visual effect on the pipe, surface polishing is gradually being used to achieve a textured effect on the surface, which we call brushing. There are generally the following types of wire drawing: straight wire drawing, round wire drawing, snowflake wire drawing, nylon wire drawing, etc.
3: Coloring process
The original stainless steel pipe coloring process is generally spray painting, spray coating, and electroplating. However, the traditional coloring process has a certain impact on the environment, and the traditional coloring process affects the accuracy of stainless steel pipes to a certain extent.
Therefore, stainless steel pipes generally use nano-spraying technology and vacuum plating technology. These two coloring processes not only have minimal impact on the environment, but also do not even affect the precision of stainless steel pipes.
The surface coloring process of stainless steel pipes can not only give them a variety of colors, but also improve the wear resistance and corrosion resistance of stainless steel pipes.
Why do stainless steel pipes rust?
When brown rust spots (spots) appear on the surface of stainless steel pipes, people are surprised: "Stainless steel will not rust. Rust is not stainless steel. There may be something wrong with the steel." In fact, this is a one-sided and wrong view based on a lack of understanding of stainless steel. Stainless steel can also rust under certain conditions.
Stainless steel pipe is a very thin, strong, fine and stable chromium-rich oxide film (protective film) formed on its surface to prevent oxygen atoms from continuing to penetrate and oxidize, and to obtain corrosion resistance. But for some reason, the film is constantly damaged, oxygen atoms in the air or liquid continue to penetrate, or iron atoms in the metal continue to separate, forming loose iron oxide, and the metal surface continues to rust. There are many forms of surface film damage, which are very common in daily life:
1. The surface of stainless steel pipes stores dust containing other metal elements or attachments of heterogeneous metal particles. In humid air, the condensed water between the attachment and the stainless steel is connected to form a micro-battery, causing an electrochemical reaction and damaging the protective film, which is called electrochemical corrosion.
2. Organic juice adheres to the surface of the stainless steel tube (such as vegetables, noodle soup, etc.). ), forms organic acids under water and oxygen conditions, and forms organic acids that corrode metal surfaces over a long period of time.
3. Substances containing acids, alkalis, and salts (such as alkaline water and lime water spray used to decorate walls) adhere to the surface of stainless steel pipes, causing local corrosion.
4. In polluted air (containing a large amount of sulfides, oxides, and hydrogen oxide), when encountering condensed water, sulfuric acid, nitric acid, and acetic acid points are formed, causing chemical corrosion. The above conditions will cause damage and corrosion to the stainless steel surface protective film. Therefore, in order to ensure that the metal surface is permanently bright and not easy to rust.